|
Self-odiagnosis
Fault table
Note:
-
◆ 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 faulty, check the wiring and connectors to these components as well as the earth connections using the current flow diagrams. This is particularly relevant for faults recorded as "occurring sporadically" (SP).
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00282
|
|
|
|
|
Throttle valve positioner -V60-1)
|
|
|
|
|
|
Short circuit
|
- Open circuit or short to earth or positive, or short between wires
|
- Cold start problems
|
- Rectify open circuit or short using current flow diagram
=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations
|
|
|
|
|
- Cold idling problems
|
|
|
|
Blocked or without voltage
|
- -V60 defective/sticking
|
- Harsh load changes
|
- Test throttle valve control unit
.
|
|
|
Connector
|
- Cables interchanged
|
- Mechanical emergency running (J338) recognised
|
|
|
|
Upper stop value
|
- Engine control unit defective
|
|
- Replace engine control unit .
|
|
|
Signal outside tolerance
|
|
|
|
|
|
Regulating difference
|
|
|
|
1) The throttle valve positioner -V60 is a component of throttle valve control unit J338.
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00305
|
|
|
|
|
Fuel consumption indicator signal
|
|
|
|
|
|
Short to positive
|
- Short to positive in wiring between engine control unit and on board computer
|
|
Test signal for fuel consumption indicator
=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00513
|
|
|
|
|
Engine speed sender -G28
|
|
|
|
|
|
No signal
|
- Open circuit or short to earth or positive in signal wire
|
- Engine no longer runs up to cut off speed (engine speed governed to approx. 5100 rpm)
|
- -Test -G28
.
|
|
|
|
- Open circuit or short to positive in earth wire
|
- Loss of power
|
- Read measured value block, Display Group 01
.
|
|
|
|
- Open circuit in screening for -G28
|
- Engine starts reluctantly or not at all when cold (cold start problems)
|
|
|
|
|
- -G28 defective
|
- Engine starts reluctantly or not at all when warm (hot start problems)
|
|
|
|
|
- Faulty signal input in engine control unit (control unit defective)
|
|
- Replace engine control unit .
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00513
|
|
|
|
|
Engine speed sender -G28
|
|
|
|
|
|
Implausible signal
|
- Metal particles on engine speed sender -G28
|
- Engine no longer runs up to cut off speed (engine speed governed to approx. 5100 rpm)
|
- -Test -G28
.
|
|
|
|
- Gap between -G28 and sender wheel too large
|
- Loss of power
|
- Read measured value block, Display Group 01
.
|
|
|
|
|
- Engine starts reluctantly or not at all when cold (cold start problems)
|
|
|
|
|
|
- Engine starts reluctantly or not at all when warm (hot start problems)
|
|
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.
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00515
|
|
|
|
|
Hall sender -G40
|
|
|
|
|
|
No signal
|
- Fault in power supply or earth connection for -G40
|
- Engine no longer runs up to cut off speed (engine speed governed to approx. 5100 rpm)
|
- -Test -G40
.
|
|
|
Implausible signal
|
- Faulty signal input in engine control unit (control unit defective)
|
- Engine starts reluctantly or not at all when cold (cold start problems)
|
|
|
|
|
- Open circuit or short to positive or earth in signal wire between -G40 and engine control unit
|
- Engine starts reluctantly or not at all when warm (hot start problems)
|
- Rectify open circuit or short using current flow diagram
=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations
|
|
|
Continued on next Page
|
|
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00515
|
|
|
|
|
(cont.)
Hall sender -G40
|
|
|
|
|
|
|
- -G40 defective
|
- Poor performance
|
|
|
|
- Fault type - see previous Page
|
- Toothed belt has slipped (signal not being sent at the expected time)
|
- See previous Page for other possible effects
|
- Check valve timing
|
|
|
|
- Loose contact
|
|
Removing
|
|
|
|
- Rotor ring defective (bent or cracked)
|
|
Iinstalling and
tensioning
toothed belt
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00516
|
|
|
|
|
Idling switch -F601)
|
|
|
|
|
|
Open/short circuit to positive
|
- Open circuit or short to positive or earth in signal wire between -F60 and engine control unit
|
- Engine running problems when pulling away
|
- Test throttle valve control unit
.
Rectify open circuit or short using current flow diagram
=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations
|
|
|
Short-circuit to earth
|
- -F60 defective
|
- Engine running problems in transition from idling/overrun to part throttle
|
- Check accelerator cable setting
|
|
|
|
- Throttle valve sticking
|
|
Parts of fuel supply system
|
|
|
|
- Floor mat pressing down on accelerator
|
- Idling speed outside specified range
|
Adjust throttle cable
|
|
|
|
- Throttle cable setting
|
|
|
|
|
Continued on next Page
|
|
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00516
|
|
|
|
|
Idling switch -F601)
|
|
|
|
|
|
Fault type - see previous Page
|
- Moisture in plug connector for throttle valve control unit
|
- See previous Page
|
|
|
|
|
- Faulty signal input in engine control unit (control unit defective)
|
|
- Replace engine control unit .
|
1) The idling switch -F60 is a component of throttle valve control unit J338.
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00518
|
|
|
|
|
Throttle valve potentiometer -G691)
|
|
|
|
|
|
Short to positive
|
- Open circuit in earth wire
|
|
|
|
|
|
- Short to positive in wiring
|
- Harsh load changes
|
- -Test -G69 , Testing throttle valve control unit.
|
|
|
|
- -G69 defective
|
|
|
|
|
Short-circuit to earth
|
- -G69 defective
|
- Poor throttle response
|
|
|
|
|
- Open circuit in wiring
|
|
|
|
|
|
- Short to earth in signal wire between -G69 and engine control unit
|
|
- Rectify short or open circuit using current flow diagram
|
|
|
Implausible signal
|
- Loose contact
|
|
|
|
|
Continued on next Page
|
|
|
1) The throttle valve potentiometer -G69 is a component of throttle valve control unit J338.
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00518
|
|
|
|
|
Throttle valve potentiometer -G691)
|
|
|
|
|
|
Implausible signal (cont.)
|
- -G69 defective
|
- See previous Page
|
- See previous Page
|
|
|
|
- Moisture or corrosion on plug connector for potentiometer
|
|
|
|
|
|
- Faulty signal input in engine control unit (control unit defective)
|
|
- Replace engine control unit .
|
1) The throttle valve potentiometer -G69 is a component of throttle valve control unit J338.
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00520
|
|
|
|
|
Air mass/air flow meter -G70/-G19
|
|
|
|
|
|
Short to positive
|
- 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 =>
Page 24-35.
|
|
|
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
.
|
|
|
|
- -G70 defective
|
- Engine idles unevenly or not at all when cold and during warm up
|
- -Replace -G70
|
|
|
|
- Faulty signal input in engine control unit (control unit defective)
|
- Idling speed outside tolerance range
|
- Replace engine control unit .
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00522
|
|
|
|
|
Coolant temperature sender -G62
|
|
|
|
|
|
Open/short circuit to positive
|
- 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 when warm
|
- Read measured value block, Display Group 00,
.
|
|
|
Short-circuit to earth
|
- -G62 defective
|
|
|
|
|
Implausible signal
|
- Faulty earth connection for -G62
|
- Increased fuel consumption
|
- Test -G62
.
|
|
|
|
- Faulty signal input in engine control unit (control unit defective)
|
- Increased emissions
|
- Replace engine control unit .
|
|
|
|
- Loose contact or corrosion due to moisture in connector plug
|
- Unsatisfactory performance
|
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00523
|
|
|
|
|
Intake air temperature sender -G42
|
|
|
|
|
|
Short-circuit to earth
|
- 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
.
|
|
|
Open/short circuit to positive
|
- -G42 defective
|
- Poor throttle response when cold or during warm-up; pick up problems when throttle opened
|
- -Check -G42
.
|
|
|
|
- Faulty earth connection for -G42
|
|
|
|
|
|
- Faulty signal input in engine control unit (control unit defective)
|
- Engine idles unevenly or not at all when cold and during warm up
|
- Replace engine control unit .
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00524
|
|
|
|
|
Knock sensor 1 -G61
|
|
|
|
|
|
Defective
|
- -G61 defective
|
|
- -Test -G61
.
|
|
|
Implausible signal
|
- Knock sensor loose or corrosion on connector
|
- Loss of power
|
|
|
|
|
- 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 and Fitting Locations
|
|
|
|
- Faulty signal input in engine control unit (control unit defective)
|
|
- Replace engine control unit .
|
|
|
|
- Loose ancillaries causing knock sensor to receive additional signals (from vibrations)
|
|
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00525
|
|
|
|
|
Lambda probe -G39
|
|
|
|
|
|
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 and Fitting Locations
|
|
|
Short-circuit to earth
|
- Faulty earth connection for -G39
|
- Rough idling
|
- Test lambda control .
|
|
|
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.
|
|
|
Signal outside tolerance
|
- Lambda probe heating not functioning
|
- Soot on spark plugs
|
|
|
|
|
- -G39 defective
|
- Emissions not OK
|
|
|
|
|
- Faulty signal input in engine control unit (control unit defective)
|
|
- Replace engine control unit .
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00530
|
|
|
|
|
Throttle valve positioner/potentiometer -G881)
|
|
|
|
|
|
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 adaptation of throttle valve control unit
.
|
|
|
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 unit
.
|
|
|
Implausible signal
|
- -G88 defective or loose contact in connector for throttle valve control unit -J338
|
- Harsh load changes
|
|
|
|
Continued on next Page
|
|
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00530
|
|
|
|
|
(cont.)
Throttle valve positioner/potentiometer -G881)
|
|
|
|
|
|
Fault type - see previous Page
|
- Faulty signal input in engine control unit (control unit defective)
|
- Loss of power
|
- Replace engine control unit .
|
|
|
|
- Contact resistance due to moisture in connector for throttle valve control unit -J338
|
- Rough idling
|
|
|
|
|
- Connector incorrectly wired
|
|
|
1) The throttle valve positioner/potentiometer -G88 is a component of throttle valve control unit -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.
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00533
|
|
|
|
|
Idling speed regulation
|
|
|
|
|
|
Upper stop value
|
- Throttle valve positioner -V60 sticking
|
- Engine running problems
|
- Test throttle valve control unit
.
|
|
|
|
- Air cleaner blocked
|
- High fuel consumption
|
- Test for leaks (unmetered air) in intake air system .
|
|
|
Lower stop value
|
- Unmetered air downstream of throttle valve
|
- Fuel odours
|
- Test injectors
.
|
|
|
|
- Injector defective
|
|
|
|
|
|
- Fuel pressure regulator defective
|
|
- Fit a new fuel pressure regulator
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00537
|
|
|
|
|
Lambda control
|
|
|
|
|
|
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
|
|
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00537
|
|
|
|
|
(cont.)
Lambda control
|
|
|
|
|
|
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.
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00545
|
|
|
|
|
Engine/gearbox electrical connection
|
|
|
|
|
|
Short 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 and Fitting Locations
|
|
|
Short-circuit to earth
|
- Faulty signal output from engine control unit (control unit defective)
|
|
- Replace engine control unit .
|
|
|
Undefined switch position
|
- Fault in automatic gearbox or in control unit for automatic gearbox
|
|
- Interrogate fault memory of control unit for automatic gearbox
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00609
|
|
|
|
|
Ignition output 1
|
|
|
|
|
|
Short 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 and 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
|
|
- Replace engine control unit .
|
|
00610
|
|
|
|
|
Ignition output 2
|
|
|
|
|
|
Short 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.
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00625
|
|
|
|
|
Speed signal
|
|
|
|
|
|
Implausible signal
|
- Open circuit or short in signal wire between dash panel insert and engine control unit
|
|
- Rectify open circuit or short using current flow diagram
=> Current Flow Diagrams, Electrical Fault Finding and 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
|
|
- Replace engine control unit .
|
Note:
If fault code 00625 is recorded the engine control unit assumes a fixed substitute value of 5 km/h.
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
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 and Fitting Locations
|
|
|
|
- Output stage in engine control unit defective (engine control unit defective)
|
|
- Replace 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.
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
00650
|
|
|
|
|
Clutch pedal switch -F36
|
|
|
|
|
|
Defective
|
- Open circuit or short circuit
|
- No cruise control
|
- Test signal from clutch pedal switch
.
|
|
00671
|
|
|
|
|
CCS Switch -E45
|
|
|
|
|
|
Implausible signal
|
- -E45 defective
- Open circuit or short circuit
|
- No cruise control
|
- Test cruise control system
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01087
|
|
|
|
|
Basic setting not carried out
|
|
|
|
|
|
Implausible signal
|
Conditions for basic setting (adaptation of throttle valve control unit) 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
|
- Engine control unit cannot learn stop values for throttle valve control unit because conditions have not been fulfilled (see "Possible causes of fault")
|
- Read measured value block, Display Group 01 or 98 .
|
|
|
|
Continued on next Page
|
|
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01087
|
|
|
|
|
Basic setting not carried out
|
|
|
|
|
|
Implausible signal (cont.)
|
- Battery voltage too low (less than 8V)
|
|
- Read measured value block, Display Group 5
|
|
|
|
- Fault in fault memory
|
- See previous Page
|
- Interrogate fault memory
|
|
|
|
- Throttle valve control unit defective
|
|
- Fit a new throttle valve control unit
|
|
|
|
- Engine control unit defective
|
|
- Replace engine control unit .
|
Important note:
Before fitting new parts, always test the old parts and check the wiring.
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01123
|
|
|
|
|
Engine control unit blocked
|
- Attempted tampering
|
|
|
|
|
|
- Open circuit or short to positive or earth in signal wiring 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 and Fitting Locations
|
|
|
|
- Control electronics for immobilizer defective/missing
|
|
- Fit a new immobilizer control unit
|
|
|
|
- Faulty signal input in engine control unit (control unit defective)
|
|
- Replace engine control unit .
|
|
|
|
- Attempt made to start vehicle with unauthorised key
|
|
- See Workshop Manual
=> Electrical System; Repair Group 96; Servicing immobilizer
|
|
|
|
- Engine control unit not adapted to control electronics for immobilizer
|
|
- Perform adaptation of engine control unit to control electronics for immobilizer.
.
|
Note on fault code 01123:
The control electronics for the immobilizer are located inside the dash panel insert and cannot be replaced separately.
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01126
|
|
|
|
|
Engine speed signal
|
|
|
|
|
|
Defective
|
- Open circuit or short to positive or earth in signal wire between engine control unit and dash panel insert
|
- Rev counter not functioning
|
- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations
|
|
|
|
- Faulty signal input in dash panel insert
|
|
- Fit a new dash panel insert
|
|
|
|
- Faulty signal output from engine control unit (control unit defective)
|
|
- Replace engine control unit .
|
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.).
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01177
|
|
|
|
|
Engine control unit
|
|
|
|
|
|
Defective
|
- Engine control unit defective
|
- Engine will not start
|
- Replace engine control unit .
|
|
01242
|
|
|
|
|
Output stages in control unit
|
|
|
|
|
|
Defective
|
- Output stages in control unit overheating
|
- Engine will not start
|
- Replace engine control unit .
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01243
|
|
|
|
|
Intake manifold changeover valve -N156
|
|
|
|
|
|
Output open
|
- Open circuit or short to positive or earth in wiring between intake manifold changeover valve -N156 and engine control unit
|
- Poor performance
|
- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations
|
|
|
Short to positive
|
- Fault in power supply to -N156
|
|
- -Test -N156
.
|
|
|
Short-circuit to earth
|
- -N156 defective
|
|
|
|
|
|
- Faulty signal output from engine control unit (control unit defective)
|
|
- Replace engine control unit .
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01247
|
|
|
|
|
Solenoid valve 1 for activated charcoal filter -N80
|
|
|
|
|
|
Short to positive
|
- Open circuit or short to positive or earth in wiring between -N80 and engine control unit
|
- Rough idling
|
- Rectify short or open circuit using current flow diagram
=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations
|
|
|
Short-circuit to earth
|
- Fault in power supply to -N80
|
- Car may run jerkily at part throttle
|
- -Test -N80
.
|
|
|
Output open
|
- -N80 defective
|
- Vehicle possibly smells of fuel
|
|
|
|
|
- Faulty signal output from engine control unit (control unit defective)
|
|
- Replace engine control unit .
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01249
|
|
|
|
|
Injector, cylinder 1 -N30
|
|
|
|
|
|
Short to positive
|
- Open circuit or short to positive or earth in wiring between engine control unit and injector
|
- Engine idles roughly or cuts out
|
- Test injectors
.
|
|
|
Short-circuit to earth
|
- Injector defective
|
|
|
|
|
Output open
|
- Fault in power supply to injector
|
|
|
|
|
|
- Faulty signal output from engine control unit (control unit defective)
|
|
- Replace engine control unit .
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01250
|
|
|
|
|
Injector, cylinder 2 -N31
|
|
|
|
|
|
Short to positive
|
=>Cyl.1 fault code 01249
|
=>Cyl.1 fault code 01249
|
=>Cyl.1 fault code 01249
|
|
|
Short-circuit to earth
|
|
|
|
|
|
Output open
|
|
|
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01251
|
|
|
|
|
Injector, cylinder 3 -N32
|
|
|
|
|
|
Short to positive
|
=>Cyl.1 fault code 01249
|
=>Cyl.1 fault code 01249
|
=>Cyl.1 fault code 01249
|
|
|
Short-circuit to earth
|
|
|
|
|
|
Output open
|
|
|
|
|
01252
|
|
|
|
|
Injector, cylinder 4 -N33
|
|
|
|
|
|
Short to positive
|
=>Cyl.1 fault code 01249
|
=>Cyl.1 fault code 01249
|
=>Cyl.1 fault code 01249
|
|
|
Short-circuit to earth
|
|
|
|
|
|
Output open
|
|
|
|
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01259
|
|
|
|
|
Fuel pump relay -J17
|
|
|
|
|
|
Defective
|
- Open circuit or short to positive in wiring between engine control unit and fuel pump relay
|
- 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 and Fitting Locations
|
|
|
|
- Fuel pump relay defective
|
|
- Test fuel pump relay .
|
|
|
|
- Faulty signal output from engine control unit (control unit defective)
|
|
- Replace 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
|
|
|---|
|
Output on V.A.G 1551 printer
|
Possible cause of fault
|
Possible effects
|
Fault rectification
|
|
01312
|
|
|
|
|
Databus drive faulty
|
- Fault in signal wires
|
- Engine running problems (juddering gear changes, load change jolts)
- No electronic stability program
|
- Test data exchange between engine/gearbox/ABS
.
|
|
01315
|
|
|
|
|
Gearbox control unit without communications
|
- Fault in signal wires leading to gearbox control unit
|
- Engine running problems (juddering gear changes, load change jolts)
|
- Test data exchange between engine/gearbox/ABS
.
|
|
01316
|
|
|
|
|
Brake control unit without communications
|
- Fault in signal wires leading to ABS control unit
|
- No electronic stability program
|
- Test data exchange between engine/gearbox/ABS
|
|
