|
Interrogating and erasing fault memory
Fault codes 16505 to 18259
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16505
|
|
|
|
|
Throttle valve potentiometer -G69
|
|
|
|
|
|
Implausible signal
|
- Moisture / corrosion in connector on throttle valve potentiometer -G69
|
- Jerky acceleration
|
- Test throttle valve
potentiometer -G69
|
|
|
|
- -G69 defective
|
- Uneven idling speed
- control
|
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16506
|
|
|
|
|
Throttle valve
potentiometer -G69
|
|
|
|
|
|
Signal too small
|
- Short to earth in signal wire between -G69 and
- engine control unit
- Fault in power supply
- to -G69
- -G69 defective
|
- Load change jolt when easing off accelerator
|
- Rectify short circuit or open circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16507
|
|
|
|
|
Throttle valve
potentiometer -G69
|
|
|
|
|
|
Signal too great
|
- Open circuit or short to positive in signal wire
- between -G69 and engine control unit
- Defective earth connection to -G69
- -G69 defective
|
- Jerky acceleration
- Load change jolt when easing off accelerator
|
- Test throttle valve
potentiometer -G69
=> Page 24-81
|
Note on fault code 16505:
The air flow rate (air mass) is compared with the throttle valve angle at each different engine speed.
Notes on fault codes 16505, 16506 and 16507:
-
◆ If one of the above faults is detected, the control unit adopts a substitute value derived from the engine speed.
-
◆ If a fault develops with both the throttle valve potentiometer and the air mass meter at the same time, the emergency running function cannot operate and therefore the engine will cut out.
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16514
|
|
|
|
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Bank1 - Probe1
|
|
|
|
|
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Electrical fault in
current circuit
|
- Corrosion due to moisture in plug connection for lambda probe heating -Z19 or lambda probe -G39
|
- Lambda closed-loop
- control switches to
- open-loop control
|
- Rectify short circuit or open circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Short circuit between
- signal wiring for lambda probe and reference earth wiring for lambda probe
|
- Rough idling
|
- Test lambda control
|
|
|
|
- Amplitude in signal wiring too small (lambda probe
- -G39 contaminated or probe slits blocked/dirty)
|
- Emission levels not OK
- Increased fuel
- consumption
|
- Read measured value block, Display Group 007
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16515
|
|
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|
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Bank 1 - Probe 1
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|
|
|
|
|
Voltage too low
|
- Short to earth or short to screening in lambda probe signal wire
|
- Lambda closed-loop
- control switches to open-loop control
- Rough idling
|
- Rectify short circuit or open circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Short to earth or short to screening in lambda probe reference earth wire
|
- Emission levels not OK
|
- Test lambda control
|
|
|
|
- Lambda probe defective
|
- Increased fuel
- consumption
|
- Read measured value block, Display Group 021
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16516
|
|
|
|
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Bank 1 - Probe 1
|
|
|
|
|
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Voltage too high
|
- Short to positive in signal wiring
|
- Lambda closed-loop
- control switches to
- open-loop control
|
- Rectify short circuit or open circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Lambda probe defective
|
- Rough idling
|
- Test lambda control
|
|
16518
|
|
- Increased fuel
- consumption
|
- Read measured value block, Display Group 007
|
|
Bank 1 - Probe 1
|
|
|
|
|
|
No activity
|
- Lambda probe defective (dirty)
|
- Emission levels not OK
|
- Read measured value block, Display Group 021
|
|
|
|
- Open circuit in wiring
- between lambda probe heating and engine control unit
|
- Spark plugs become
- covered with soot
|
|
|
|
|
- Lambda probe heating not functioning
|
|
- Test lambda probe heating
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16519
|
|
|
|
|
Bank1 - Probe1
|
|
|
|
|
|
Heating current circuit electrical fault
|
- Open circuit or short circuit
|
- Lambda probe heating not functioning
|
- Test lambda probe heating
|
|
16705
|
|
|
|
|
Engine speed sender
-G28
|
|
|
|
|
|
Implausible signal
|
- Engine speed sender -G28 loose
- Sender wheel loose
|
- Engine misfires
|
- Test engine speed sender -G28
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16706
|
|
|
|
|
Engine speed sender
-G28
|
|
|
|
|
|
No signal
|
- Open circuit or short to positive or earth in signal wiring
|
- Engine will not start
|
- Rectify open circuit or short circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Open circuit or short to positive in earth wiring
|
- Engine cuts out
|
|
|
|
|
- -G28 loose or defective
|
|
- Test -G28
|
|
|
|
- Open circuit in connection to screening for -G28
|
|
|
|
|
|
- Faulty signal input in
- engine control unit
- (control unit defective)
|
|
- Fit a new engine control unit
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16711
|
|
|
|
|
Knock sensor 1 -G61
|
|
|
|
|
|
Signal too small
|
- Knock sensor loose or
- corrosion on plug
|
- High fuel consumption
|
- Tightening torque for knock sensor: 20 Nm
|
|
|
- Open circuit in sender earth wiring between knock sensor and engine control unit
|
- Poor performance
|
|
|
16716
|
|
|
|
|
Knock sensor 2 -G66
|
|
|
|
|
|
Signal too small
|
- Open circuit or short to earth or screening in signal wire between knock
- sensor and engine control unit
|
|
- Read measured value block, Display Group 016
=> Page 01-132
|
|
|
|
- Knock sensor defective
|
|
- Test knock sensor
=> Page 28-18
|
|
|
|
- Faulty signal input in
- engine control unit
- (control unit defective)
|
|
- Fit a new engine control unit
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16885
|
|
|
|
|
Vehicle speed signal
|
|
|
|
|
|
Implausible signal
|
- Vehicle speed sender
- defective
|
- Air conditioner compressor does not cut out at full throttle in 1st gear
|
- Test road speed signal
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Open circuit or short circuit between vehicle speed sender and speedometer
|
- Idling speed deviates briefly from specified speed
|
- Read measured value block, Display Group 011, display zone 3
=> Page 01-127
|
|
|
|
- Open circuit or short circuit between dash panel insert and engine control unit
|
- Poor load change
- performance
|
- Rectify open circuit or short circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Speedometer defective
|
- Malfunction in systems which use road speed
- signal
|
- Test road speed signal
=> Page 24-95
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16989
|
|
|
|
|
Control unit defective
|
|
|
|
|
|
|
- Engine control unit
- defective
|
- Engine will not start
|
- Fit a new engine control unit => Page 24-10
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17733
|
|
|
|
|
Knock control Cyl. 1
|
|
|
|
|
|
Control limit reached
|
- Poor-quality fuel (less than RON 91)
|
- High fuel consumption
|
- Fill up with petrol (at least RON 91)
|
|
|
|
- Abnormal engine noise
- (ancillaries loose)
|
- Poor performance
|
- Test knock sensor
=> Page 28-18
|
|
|
- Open circuit in screening for knock sensor 1 or 2
|
- Engine runs unevenly
|
- Rectify open circuit or short circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Loose contact in connector
|
- Vehicle will not reach top speed
|
- Read measured value block, Display Groups 014 and 015 => Page 01-130
|
|
|
|
- Wrong tightening torque on knock sensor
|
|
- Tighten knock sensor (20Nm)
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17734
|
|
|
|
|
Knock control Cyl. 2
|
|
|
|
|
|
Control limit reached
|
=> Knock control Cyl. 1
Fault code 17733
|
=> Knock control Cyl. 1
Fault code 17733
|
=> Knock control Cyl. 1
Fault code 17733
|
|
17735
|
|
|
|
|
Knock control Cyl. 3
|
|
|
|
|
|
Control limit reached
|
=> Knock control Cyl. 1
Fault code 17733
|
=> Knock control Cyl. 1
Fault code 17733
|
=> Knock control Cyl. 1
Fault code 17733
|
|
17736
|
|
|
|
|
Knock control Cyl. 4
|
|
|
|
|
|
Control limit reached
|
=> Knock control Cyl. 1
Fault code 17733
|
=> Knock control Cyl. 1
Fault code 17733
|
=> Knock control Cyl. 1
Fault code 17733
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17913
|
|
|
|
|
Idling speed switch -F60
|
|
|
|
|
|
Does not close/open circuit
|
- Throttle valve sticking
|
- Load change jolt when easing off accelerator
|
- Test idling speed switch
=> Page 24-68
|
|
|
|
- Accelerator cable setting
- Floor mat pressing down on accelerator
|
- Idling speed not within the specified range
|
- Adjust accelerator cable
|
|
|
|
- Open circuit or short to positive between idling speed switch -F60 and
- engine control unit
|
- Air conditioner compressor only cuts in at high engine speed
|
- Rectify short circuit or open circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- -F60 defective
|
|
|
|
|
|
- Faulty signal input in
- engine control unit
- (control unit defective)
|
|
- Fit a new engine control unit
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17914
|
|
|
|
|
Idling speed switch -F60
|
|
|
|
|
|
Does not open / short to earth
|
- Moisture in throttle valve connector
|
- Idling speed closed-loop control switches to open-loop control
|
- Test idling speed switch
=> Page 24-68
|
|
|
|
- Short to earth between
- idling speed switch -F60 and engine control unit
- -F60 defective
|
- Idling speed not within the specified range
- Load change jolt when easing off accelerator
|
|
|
|
|
|
- Air conditioner compressor only cuts in at high engine speed
|
- Rectify short circuit or open circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Faulty signal input in
- engine control unit
- (control unit defective)
|
|
- Fit a new engine control unit
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17915
|
|
|
|
|
Idling system learned value
|
|
|
|
|
|
Lower limit attained
|
- Unmetered air entering system upstream of throttle valve control part
|
- High idling speed
|
- Rectify leak
|
|
17916
|
|
|
|
|
Idling system learned value
|
|
|
|
|
|
Upper limit attained
|
- Intake system obstructed (air cleaner or intake
- passage)
|
- No power
|
- Check intake system
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17920
Intake manifold
changeover valve -N156
|
|
|
|
|
|
Short circuit to
positive
|
- Short to positive in wiring between intake manifold change-over valve -N156 and engine control unit
|
- -N156 does not open (loss of power above 4700 rpm)
|
- Test -N156
=> Page 24-50
|
|
|
|
- -N156 defective
|
|
|
|
|
|
- Faulty signal input in
- engine control unit
- (control unit defective)
|
|
- Fit a new engine control unit
|
|
|
|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17923
Intake manifold
changeover valve -N156
|
|
|
|
|
|
Short circuit to earth
|
- Short to earth in wiring
- between intake manifold changeover valve -N156 and engine control unit
|
- -N156 does not open (loss of power above 4700 rpm)
|
- Test -N156
=> Page 24-50
|
|
|
|
- -N156 defective
|
|
|
|
|
|
- Faulty signal input in
- engine control unit
- (control unit defective)
|
|
- Fit a new engine control unit
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17924
Intake manifold
changeover valve -N156
|
|
|
|
|
|
Open circuit
|
- Open circuit in wiring
- between intake manifold changeover valve -N156 and engine control unit
|
- -N156 does not open (loss of power above 4700 rpm)
|
- Test -N156
=> Page 24-50
|
|
|
|
- Fault in power supply
- to -N156
|
|
|
|
|
|
- -N156 defective
|
|
|
|
|
|
- Faulty signal input in
- engine control unit
- (control unit defective)
|
|
- Fit a new engine control unit
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17934
|
|
|
|
|
Bank 1, camshaft adjustment valve =>-N205
|
|
|
|
|
|
Short circuit to
positive
|
- Short to positive between camshaft adjustment valve -N205 and engine control unit
|
|
- Rectify open circuit or short circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Valve -N205 defective
|
- Loss of torque at low
- engine speeds
- (1300-3600 rpm)
|
- Test -N205
=> Page 28-31
|
|
|
|
- Fuse defective
|
|
- Test fuse
|
|
|
|
- Faulty signal input in
- engine control unit
- (control unit defective)
|
|
- Fit a new engine control unit
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17935
|
|
|
|
|
Bank 1, camshaft adjustment valve =>-N205
|
|
|
|
|
|
Short circuit to earth
|
- Short to earth between camshaft adjustment valve -N205 and engine control unit
|
|
- Rectify open circuit or short circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Valve -N205 defective
|
- Loss of torque at low
- engine speeds
- (1300-3600 rpm)
|
- Test -N205
=> Page 28-31
|
|
|
|
- Fuse defective
|
|
- Test fuse
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17936
|
|
|
|
|
Bank 1, camshaft adjustment valve =>-N205
|
|
|
|
|
|
Open circuit
|
- Open circuit between
- camshaft adjustment valve -N205 and engine control unit
|
- Loss of torque at low
- engine speeds
- (1300-3600 rpm)
|
- Rectify open circuit or short circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
Test -N205
=> Page 28-31
|
|
|
|
- Fuse defective
|
|
- Test fuse
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17953
|
|
|
|
|
Throttle valve control
|
|
|
|
|
|
Malfunction
|
- Fault in power supply or earth connection for throttle valve potentiometer -G69 and throttle valve positioner sender
- -G127
|
- Increased idling speed
- Load change jolt when easing off accelerator
|
- Read measured value block, Display Group 023
=> Page 01-140
|
|
|
|
- Open circuit in signal wire for -G69 and -G127
|
|
- Test throttle valve control part -J338
=>Page24-62
|
|
|
|
- -G69 and -G127 defective
|
|
- Test throttle valve control part (procedure for
vehicles with cruise
control) => Page 24-73
|
|
|
|
- Throttle valve stiff or dirty
|
|
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17967
|
|
|
|
|
Throttle valve control part -J338
|
|
|
|
|
|
Fault in basic setting
|
- Idling speed switch open
- Minimum stop not reached (jamming)
|
|
- Perform adaption of throttle valve control part => Page 01-114
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17972
|
|
|
|
|
Throttle valve control part -J338
|
|
|
|
|
|
Low voltage at basic setting
|
- Voltage less than 10V
- during basic setting
|
|
- Test voltage and read measured value block,
Display Group 003, display zone 2=> Page 01-111
|
Note on fault code 17978:
If an attempt is made to start the car with an unmatched key, the control unit will register a static fault. If the car is then started with a correctly matched key, the fault will be re-classified as a sporadic fault.
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18010
|
|
|
|
|
Voltage supply
terminal 30
|
|
|
|
|
|
Voltage too low
|
- Battery was disconnected
|
|
- Test power supply to
engine control unit
=> Page 28-15
|
|
|
|
- Permanent power supply to control unit was disconnected, or open circuit
|
|
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18020
|
|
|
|
|
Engine control unit
incorrectly coded
|
|
|
|
|
|
|
- Engine control unit
- incorrectly coded
|
- Loss of performance
- Increased emissions
- Various faults in fault
- memory
|
- Code control unit
=> Page 01-79
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18034
|
|
|
|
|
CAN-Bus
|
|
|
|
|
|
No message from gearbox CU
|
- Fault in data transmission wires to gearbox control unit
|
- Automatic gearbox switches to emergency running mode
- Engine running problems (jerky gearshifts, load change jolts)
|
- Test data exchange
between Motronic, ABS and gearbox (CAN bus)
=> Page 24-98
|
|
18259
|
|
|
|
|
CAN-Bus
|
|
|
|
|
|
No message from ABS CU
|
- Fault in data transmission wires to ABS control unit
|
- Electronic stability program (ESP) not functioning
|
- Test data exchange
between Motronic, ABS and gearbox (CAN bus)
=> Page 24-98
|
|
