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Self-diagnosis
Fault table
Notes:
-
◆ The following table (arranged by fault code number) lists all the faults which the engine control unit can recognise and which can appear on the V.A.G 1551 printer display.
-
◆ The fault table is listed according to the 5 digit fault code on the left.
-
◆ If a fault occurs only occasionally or if the fault memory is not erased after the repair has been carried out, the fault will appear on the display as a "sporadically occurring fault" (SP).
-
◆ Explanation of the fault types (e.g. "open circuit/short circuit to earth"):
=> Fault reader operating instructions
-
◆ Before renewing components indicated as being defective, check the wiring and connectors for these components as well as the earth connections using the current flow diagrams. This is particularly important for faults which are displayed as "occurring sporadically" (SP).
-
◆ Sporadic faults are faults which only occur occasionally (e.g. loose contacts). "Sporadic" means "intermittent" or "at irregular intervals".
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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00282
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Throttle valve positioner -V60-1)
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Short circuit
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- Open circuit or short to earth or positive, or short between wires
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- Cold start problems
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- Rectify open circuit or short using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
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- Cold idling problems
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Blocked or without voltage
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- -V60 defective/sticking
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- Jerky load changes
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- Test throttle valve control part
.
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Connector
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- Cables interchanged
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- Mechanical emergency running (-J338) recognised
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Upper stop value
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- Engine control unit defective
|
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- Fit a new engine control unit .
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Signal outside tolerance
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Regulating difference
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1) The throttle valve positioner V60 is a component of the throttle valve control part J338.
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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00305
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Fuel consumption indicator signal
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Short circuit to
positive
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- Short to positive in wiring between engine control unit and on-board computer
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Test wiring using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
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Note:
The fuel consumption indicator signal comes from the engine control unit and is used by the on-board computer to calculate the fuel consumption.
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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00513
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Engine speed sender -G28
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No signal
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- Open circuit or short to earth or positive in signal wire
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- Engine no longer runs up to cut-off speed (engine speed governed to about 5100 rpm)
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- Test -G28
.
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- Open circuit or short to positive in earth wire
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- Reduced power
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- Read measured value block, Display Group 01
.
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- Open circuit in screening for -G28
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- Engine starts reluctantly or not at all when cold (cold start problems)
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- -G28 defective
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- Engine starts reluctantly or not at all when warm (hot start problems)
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- Faulty signal input in engine control unit (control unit defective)
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- Fit a new engine control unit .
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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00513
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Engine speed sender -G28
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Implausible signal
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- Metal particles on engine speed sender -G28
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- Engine no longer runs up to cut-off speed (engine speed governed to about 5100 rpm)
|
- Test -G28
.
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- Gap between -G28 and sender wheel too large
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- Reduced power
|
- Read measured value block, Display Group 01
.
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- Engine starts reluctantly or not at all when cold (cold start problems)
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- Engine starts reluctantly or not at all when warm (hot start problems)
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Notes on fault code 00513:
-
◆ The presence of metal particles can result in additional signals.
-
◆ If the gap between the sender and the sender wheel is too large or if the sender wheel is damaged, the signals may not be sent or may be too small to be picked up.
-
◆ A loose sender wheel (or loose sender) may result in uneven signal transmission.
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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00515
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Hall sender -G40
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No signal
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- Fault in power supply or earth connection for -G40
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- Engine no longer runs up to cut-off speed (engine speed governed to about 5100 rpm)
|
- Test -G40
.
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Implausible signal
|
- Faulty signal input in engine control unit (control unit defective)
|
- Engine starts reluctantly or not at all when cold (cold start problems)
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- Open circuit or short to positive or earth in signal wire between -G40 and engine control unit
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- Engine starts reluctantly or not at all when warm (hot start problems)
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- Rectify open circuit or short using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
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Continued on next page
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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00515
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Hall sender -G40
(cont.)
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- -G40 defective
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- Loss of power
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- Fault type - see previous page
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- Toothed belt has slipped (signal not being sent at the expected time)
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- See previous page for other possible effects
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- Check valve timing
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- Loose contact
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- Rotor ring defective (bent or cracked)
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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00516
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Idling switch -F601)
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Open/short circuit to positive
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- Open circuit or short to positive or earth in signal wire between -F60 and engine control unit
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- Engine running problems when pulling away
|
- Test throttle valve control part
.
Rectify open circuit or short using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
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Short circuit to
earth
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- -F60 defective
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- Engine running problems in transition from idling/overrun to part throttle
|
- Check throttle cable
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- Throttle valve sticking
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- Floor mat pressing down on accelerator
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- Idling speed outside specified range
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- Throttle cable setting
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Continued on next page
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V.A.G 1551 print-out
|
Possible causes of fault
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Possible effects
|
Fault remedy
|
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00516
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Idling switch -F601)
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Fault type - see previous page
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- Moisture in plug connector for throttle valve control part
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- See previous page
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- Faulty signal input in engine control unit (control unit defective)
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- Fit a new engine control unit .
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1) The idling switch F60 is a component of the throttle valve control part J338.
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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00518
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Throttle valve potentiometer -G691)
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Open/short circuit to positive
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- Open circuit in earth wire
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- Short to positive in wiring
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- Jerky load changes
|
- Test -G69 , Testing throttle valve control part
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- -G69 defective
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Open/short circuit to earth
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- -G69 defective
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- Poor throttle response
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- Open circuit
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- Short to earth in signal wire between -G69 and engine control unit
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- Rectify short or open circuit using current flow diagram
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Implausible signal
|
- Loose contact
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Continued on next page
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1) The throttle valve potentiometer G69 is a component of the throttle valve control part J338.
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V.A.G 1551 print-out
|
Possible causes of fault
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Possible effects
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Fault remedy
|
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00518
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Throttle valve potentiometer -G691)
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Implausible signal (cont.)
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- -G69 defective
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- See previous page
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- See previous page
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- Moisture or corrosion on plug connector for potentiometer
|
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- Faulty signal input in engine control unit (control unit defective)
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- Fit a new engine control unit
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1) The throttle valve potentiometer G69 is a component of the throttle valve control part J338.
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V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
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00520
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Air mass/flow meter -G70/G19
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Short circuit to
positive
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- Open circuit or short to positive or earth in signal wire between -G70 and engine control unit
|
- Engine running problems
- Engine starts reluctantly or not at all when cold (cold start problems)
|
- Test -G70
|
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Open/short circuit to earth
|
- Fault in power supply to -G70
|
- Engine starts reluctantly or not at all when warm (hot start problems)
|
- Read measured value block, Display Group 00
.
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- -G70 defective
|
- Engine idles unevenly or not at all when cold and during warm-up
|
- Fit a new -G70
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- Faulty signal input in engine control unit (control unit defective)
|
- Idling speed outside
- tolerance range
|
- Fit a new engine control unit .
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V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
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00522
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Coolant temperature sender -G62
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Open/short circuit to positive
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- Open circuit or short to positive or earth in wiring between -G62 and engine control unit
|
- Cold start problems at very low temperatures
- Engine running problems during warm-up
|
- Read measured value block, Display Group 00
.
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Short circuit to
earth
|
- -G62 defective
|
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Implausible signal
|
- Faulty earth connection for -G62
|
- Increased fuel consumption
|
- Test -G62
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- Faulty signal input in engine control unit (control unit defective)
|
- Increased emissions
|
- Fit a new engine control unit .
|
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- Loose contact or corrosion due to moisture in connector plug
|
- Unsatisfactory performance
|
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
|
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00523
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Intake air temperature sender -G42
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Short circuit to
earth
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- Open circuit or short to positive or earth in wiring between -G42 and engine control unit
|
- Hot start problems
|
- Read measured value block, Display Group 00
.
|
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Open/short circuit to positive
|
- -G42 defective
|
- Poor throttle response when cold and during warm-up; pick-up problems when throttle opened
|
- Test -G42
.
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|
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- Faulty earth connection for -G42
|
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- Faulty signal input in engine control unit (control unit defective)
|
- Engine idles unevenly or not at all when cold and during warm-up
|
- Fit a new engine control unit .
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V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
00524
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Knock sensor 1 -G61
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Defective
|
- -G61 defective
|
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- Test -G61
.
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Implausible signal
|
- Knock sensor loose (tightening torque: 20 Nm) or corrosion on connector
|
- Reduced power
|
|
|
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- Open circuit or short to positive/earth or to screening for signal wire between knock sensor and engine control unit
|
- High fuel consumption
|
- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
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|
|
- Faulty signal input in engine control unit (control unit defective)
|
|
- Fit a new engine control unit .
|
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- Loose ancillaries causing knock sensor to receive additional signals (from vibrations)
|
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V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
00525
|
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Lambda probe -G39
|
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Output open
|
- Open circuit or short to earth or positive in signal wire between -G39 and engine control unit
|
- No lambda control
|
- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
Short circuit to
earth
|
- Faulty earth connection for -G39
|
- Rough idling
|
- Test lambda control
.
|
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|
Implausible signal
|
- Corrosion due to moisture in plug connector for lambda probe heating -Z19 or lambda probe -G39
|
- Increased fuel consumption
|
- Read measured value block, Display Group 01 or 99.
|
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Signal outside tolerance
|
- Lambda probe heating not functioning
|
- Soot on spark plugs
|
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- -G39 defective
|
- Emissions not OK
|
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|
- Faulty signal input in engine control unit (control unit defective)
|
|
- Fit a new engine control unit .
|
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|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
00530
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Throttle valve positioner/potentiometer -G881)
|
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Open/short circuit to positive
|
- Open circuit or short to earth or positive in signal wire between -G88 and engine control unit
|
- Idling speed positioner deactivated; engine idles with a mechanically regulated air flow through the emergency running slot
- Different idling speed
|
- Perform adaption of throttle valve control part
.
|
|
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Open/short circuit to earth
|
- Open circuit in earth wire between -G88 and engine control unit
|
- Cold start problems
- Cold idling problems
|
- Test throttle valve control part
.
|
|
|
Implausible signal
|
- -G88 defective or loose contact in connector for throttle valve control part -J338
|
- Hard load changes
|
|
|
|
Continued on next page
|
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V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
00530
|
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|
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Throttle valve positioner/potentiometer -G881)(cont.)
|
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Fault type - see previous page
|
- Faulty signal input in engine control unit (control unit defective)
|
- Reduced power
|
- Fit a new engine control unit .
|
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- Contact resistance due to moisture in connector for throttle valve control part -J338
|
- Rough idling
|
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- Connector incorrectly wired
|
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1) The throttle valve positioner/potentiometer -G88 is a component of the throttle valve control part -J338.
The throttle valve positioner/potentiometer (variable resistance; activated by the throttle valve positioner) informs the engine control unit of the status of the throttle valve positioner.
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V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
00533
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Idling control
|
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Upper stop value
|
- Throttle valve positioner -V60 sticking
|
- Engine running problems
|
- Test throttle valve control part
.
|
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|
|
- Air cleaner blocked
|
- High fuel consumption
|
- Test air intake system for leaks (unmetered air)
.
|
|
|
Lower stop value
|
- Unmetered air downstream of throttle valve
|
- Fuel odours
|
- Test injectors
.
|
|
|
|
- Injector defective
|
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|
- Fuel pressure regulator defective
|
|
- Fit a new fuel pressure regulator
|
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|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
00537
|
|
|
|
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Lambda control
|
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Upper stop value
|
- Short to earth in signal wire between lambda probe and engine control unit
|
- No lambda control
|
- Test lambda probe and lambda control
.
|
|
|
|
- Injector(s) defective (blocked)
|
- Engine running problems
|
- Test injectors
.
|
|
|
|
- Fuel pressure regulator defective
|
|
- Test fuel pressure regulator and holding pressure
.
|
|
|
|
- Fuel pump defective
|
|
- Test fuel pump
|
|
|
|
- Fuel tank empty
|
|
- Fill up fuel tank
|
|
|
Lower stop value
|
- See next page
|
|
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|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
00537
|
|
|
|
|
Lambda control (continued)
|
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Lower stop value
|
- Solenoid valve 1 for activated charcoal filter -N80 leaking/sticking
|
- No lambda control
|
- Test -N80
.
|
|
|
|
- Injector(s) defective (not closing fully)
|
- Engine running problems
|
- Test injectors
.
|
|
|
|
- Fuel pressure regulator defective
|
|
- Test fuel pressure regulator and holding pressure
.
|
Note:
-
◆ If the fault "Lambda control upper stop value" is recorded, this means that the lambda control has reached the "mixture enrichment" regulating limit. However, the lambda probe is still detecting a "lean" mixture.
-
◆ If the fault "Lambda control lower stop value" is recorded, this means that the lambda control has reached the "mixture leaning down" regulating limit. However, the lambda probe is still detecting a "rich" mixture.
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|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
00545
|
|
|
|
|
Engine/gearbox electrical connection
|
|
|
|
|
|
Short circuit to
positive
|
- Open circuit or short to positive or earth in wiring between engine control unit and gearbox control unit
|
- See Workshop Manual for automatic gearbox
|
- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
Short circuit to
earth
|
- Faulty signal output from engine control unit (engine control unit defective)
|
|
- Fit a new engine control unit .
|
|
|
Undefined switch condition
|
- Fault in automatic gearbox or in control unit for automatic gearbox
|
|
- Interrogate fault memory of control unit for automatic gearbox
|
|
|
|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
00609
|
|
|
|
|
Ignition output 1
|
|
|
|
|
|
Short circuit to
positive
|
- Open circuit or short to positive in wiring between engine control unit and output stage of ignition coil
|
- Starting problems
- Very rough running in all engine load ranges
- Severe loss of power
|
- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Faulty earth connection for output stage of ignition coil
|
|
- Test twin-spark injection system with two ignition coils .
|
|
|
|
- Ignition coil output stage defective
|
|
|
|
|
|
- Engine control unit defective
|
|
- Fit a new engine control unit .
|
|
00610
|
|
|
|
|
Ignition output 2
|
|
|
|
|
|
Short circuit to
positive
|
- See fault code 00609
|
- See fault code 00609
|
- See fault code 00609
|
Note:
Ignition outputs 1 and 2 are the outputs on the engine control unit via which the engine control unit activates the output stage of the ignition coils.
|
|
|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
00625
|
|
|
|
|
Speed signal
|
|
|
|
|
|
Implausible signal
|
- Open circuit or short in signal wire between dash panel insert and engine control unit
|
|
- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Short circuit in signal wire between speedometer and another control unit which uses the road speed signal
|
|
|
|
|
|
- Faulty signal input in engine control unit
|
|
- Fit a new engine control unit .
|
Note:
If fault code 00625 is recorded the engine control unit assumes a fixed substitute value of 5 km/h.
|
|
|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
00635
|
|
|
|
|
Lambda probe heating before Cat.
|
|
|
|
|
|
Defective
|
- Open circuit or short to positive or earth in wiring between engine control unit and lambda probe
|
- Rough idling
- Emission problems
|
- Test lambda control
.
Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Output stage in engine control unit defective (engine control unit defective)
|
|
- Fit a new engine control unit .
|
|
|
|
- Lambda probe defective
|
|
- Fit a new lambda probe
|
|
|
|
- Fuel pump relay or fuel pump relay activation defective
|
|
- Test fuel pump relay and activation .
|
Notes:
-
◆ The positive power supply to the lambda probe heating comes via the fuel pump relay.
-
◆ The earth connection for the lambda probe heating is provided by the engine control unit, i.e. the entire current supply for the lambda probe heating comes via the engine control unit.
|
|
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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00668
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Vehicle voltage, terminal 30
Open circuit
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- Open circuit in power supply from terminal 30, e.g. loose contact in power supply wiring to engine control unit
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- Test power supply using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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01087
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Basic setting not carried out
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Implausible signal
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Conditions for basic setting (adaption of throttle valve control part) not fulfilled:
- Ignition not switched on
- Engine running
- Idling speed switch not closed
- Implausible voltage signals from throttle valve potentiometer and throttle valve positioner potentiometer (control unit not receiving clear voltage signal; throttle valve not fully closed)
- Throttle valve positioner sticking or mechanically damaged
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- Engine control unit cannot learn stop values for throttle valve control part because conditions have not been fulfilled (see "Possible causes of fault")
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- Read measured value block, Display Group 01 or 98 .
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Continued on next page
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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01087
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Basic setting not carried out
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Implausible signal (cont.)
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- Battery voltage too low (less than 8V)
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- Read measured value block, Display Group 05
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- Fault in fault memory
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- See previous page
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- Interrogate fault memory
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- Throttle valve control part defective
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- Fit a new throttle valve control part
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- Engine control unit defective
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- Fit a new engine control unit .
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Important note:
Before fitting new parts, always test the old parts and check the wiring.
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
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Fault remedy
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01126
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Engine speed signal
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Defective
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- Open circuit or short to positive or earth in signal wire between engine control unit and dash panel insert
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- Rev counter not
- functioning
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- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
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- Faulty signal input in dash panel insert
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- Fit a new dash panel insert
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- Faulty signal output from engine control unit (control unit defective)
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- Fit a new engine control unit .
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Note on fault code 01126:
In this case the "engine speed signal" is not the signal from the engine speed sender (located on the crankshaft) to the engine control unit, but rather the signal from the engine control unit to the dash panel insert. This signal is also used for various other systems (e.g. rev counter, air conditioner etc.).
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V.A.G 1551 print-out
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Possible causes of fault
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Possible effects
|
Fault remedy
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01177
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Engine control unit
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Defective
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- Engine control unit defective
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- Engine might not start
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- Fit a new engine control unit .
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01242
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Output stages in control unit
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Defective
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- Output stages in control unit overheating
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- Engine will not start
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- Fit a new engine control unit .
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V.A.G 1551 print-out
|
Possible causes of fault
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Possible effects
|
Fault remedy
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01243
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Intake manifold change-over valve -N156
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Output open
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- Open circuit or short to positive or short to earth in the wiring between -N156 and engine control unit
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- Poor acceleration
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- Test -N156 => Page 01-55
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Short to positive
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- Voltage supply for N156 defective
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Short to earth
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- N156 defective
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- Engine control unit signal output defective (engine control unit defective)
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- Replace engine control unit .
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V.A.G 1551 print-out
|
Possible causes of fault
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Possible effects
|
Fault remedy
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01247
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Solenoid valve 1 for activated charcoal filter -N80
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Short circuit to
positive
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- Open circuit or short to positive or earth in wiring between -N80 and engine control unit
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- Rough idling
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- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
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Short circuit to
earth
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- Fault in power supply to -N80
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- Car may run jerkily at part throttle
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- Test -N80
.
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Output open
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- -N80 defective
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- Vehicle possibly smells of fuel
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- Faulty signal output from engine control unit (control unit defective)
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- Fit a new engine control unit .
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V.A.G 1551 print-out
|
Possible causes of fault
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Possible effects
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Fault remedy
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01249
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No.1 cyl. injector -N30
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Short circuit to
positive
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- Open circuit or short to positive or earth in wiring between engine control unit and injector
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- Engine idles roughly or cuts out
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- Test injectors
.
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Short circuit to
earth
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- Injector defective
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Output open
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- Fault in power supply to injector
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- Faulty signal output from engine control unit (control unit defective)
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- Fit a new engine control unit .
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V.A.G 1551 print-out
|
Possible causes of fault
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Possible effects
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Fault remedy
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01250
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No. 2 cyl. injector -N31
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Short circuit to positive
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=>Cyl.1 fault code 01249
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=>Cyl.1 fault code 01249
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=>Cyl.1 fault code 01249
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Short circuit to
earth
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Output open
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V.A.G 1551 print-out
|
Possible causes of fault
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Possible effects
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Fault remedy
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01251
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No. 3 cyl. injector -N32
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Short circuit to positive
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=>Cyl.1 fault code 01249
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=>Cyl.1 fault code 01249
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=>Cyl.1 fault code 01249
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Short circuit to
earth
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Output open
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01252
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No. 4 cyl. injector -N33
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Short circuit to positive
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=>Cyl.1 fault code 01249
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=>Cyl.1 fault code 01249
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=>Cyl.1 fault code 01249
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Short circuit to
earth
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Output open
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|---|
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V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
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01259
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Fuel pump relay -J17
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Defective
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- Open circuit or short to positive in wiring between engine control unit and fuel pump relay
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- If the wiring has an open circuit or short to positive, the engine will not run.
|
- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
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- Fuel pump relay defective
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- Test fuel pump relay
.
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- Faulty signal output from engine control unit (control unit defective)
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- Fit a new engine control unit .
|
Note:
If fault code 01259 is recorded, components which are supplied with power via the fuel pump relay may also register as faulty.
=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
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01312
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Data bus drive
defective
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- Fault in data bus wiring or malfunction in one of the control units linked into the data bus
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- Engine performance problems (jerks during gearchange or when opening and closing throttle)
- No ESP function
|
- Test data transmission between engine / gearbox / ABS
.
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01315
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Gearbox control unit
No communication
|
- Fault in data bus wiring to gearbox control unit
|
- Engine performance problems (jerks during gearchange or when opening and closing throttle)
|
- Test data transmission between engine / gearbox / ABS
.
|
1)"Electronic Stability Program"
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|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
01656
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Crash signal
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Short to positive
|
- Short circuit to positive in wiring between engine control unit and airbag control unit
|
- Airbag control unit will not cut off fuel supply to engine after a crash in which airbags are triggered
|
- Test crash signal or wiring from airbag control unit to engine control unit
|
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Short to earth
|
- Short circuit to earth in wiring between engine control unit and airbag control unit
|
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Implausible
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- Loose contact in wiring between airbag control unit and engine control unit
|
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Notes:
-
◆ The fault "Crash signal; Short to positive" will be recorded in the memory if the duty cycle of the pulse width-modulated signal from the airbag control unit exceeds 89%, or if there is a short circuit to positive in the wiring. See next page for additional notes.
Additional notes:
-
◆ The fault "Crash signal; Short to earth" will be recorded in the memory if the duty cycle of the pulse width-modulated signal from the airbag control unit is below 11%, or if there is a short circuit to earth in the wiring.
-
◆ The fault "Crash signal; Implausible" will be recorded in the memory if the duty cycle of the pulse width-modulated signal from the airbag control unit is between 25% and 75%, i.e. in a range which is not normally possible. (This indicates a malfunction in the airbag control unit).
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|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18017
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|
Crash switch-off triggered
|
- Vehicle has had an accident in which airbags have been triggered; or final control diagnosis has been performed on airbag control unit
|
- Engine cuts out, but can be started again afterwards
|
- Test crash signal
|
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|
|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17978
|
|
|
|
|
Engine control unit blocked
|
- Attempted tampering
|
|
|
|
|
|
- Open circuit or short to positive or earth in signal wire between engine control unit and immobilizer control unit
|
- Engine starts but cuts out again immediately
|
- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Control electronics for immobilizer defective/missing
|
|
- Fit a new immobilizer control unit
|
|
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|
- Fit a new engine control unit .
|
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|
|
- Attempt made to start vehicle with unauthorised key
|
|
- See Workshop Manual
=> Electrical System; Repair Group 96; Servicing immobilizer
|
|
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- Engine control unit not adapted to control electronics for immobilizer
|
|
- Perform adaption of engine control unit to control electronics for immobilizer .
|
|
