|
Interrogating and erasing fault memory
Fault codes 16514 - 18259
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16514
|
|
|
|
|
Bank1 - Probe1
|
|
|
|
|
|
Electrical fault in 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 wire for lambda probe and reference earth wire for lambda probe
|
- Rough idling
|
- Test lambda control
|
|
|
|
- Amplitude in signal wire too small (lambda probe
- -G39 contaminated or probe slits blocked/dirty)
|
- Emission levels not OK
- Increased fuel
- consumption
|
- Read measured value block, Display Group 009
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16515
|
|
|
|
|
Bank 1 - Probe 1
|
|
|
|
|
|
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
|
|
|
|
|
|
Voltage too high
|
- Short to positive in signal wire
|
- Lambda closed-loop
- control switches to
- open-loop control
- Increased fuel
- consumption
- Emission values not OK
- Spark plugs become
- covered with soot
|
- Rectify short circuit or open circuit
=> Current Flow Diagrams, Electrical Fault-Finding & Fitting Locations
|
|
|
|
- Lambda probe defective
|
- Rough idling
|
- Test lambda control
|
|
|
|
|
|
- Read measured value block, Display Group 021
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16518
|
|
|
|
|
Bank 1 - Probe 1
|
|
|
|
|
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No activity
|
- Lambda probe defective (dirty)
|
- Lambda closed-loop
- control switches to
- open-loop control
- Increased fuel
- consumption
- 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
|
- Rough idling
|
- Test lambda probe heating
|
|
|
|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16534
Bank 2 - Probe 1
|
|
|
|
|
|
Electrical fault in
circuit
|
=>Bank 1, Lambda probe 1
fault code 16514
|
=>Bank 1, Lambda probe 1
fault code 16514
|
=>Bank 1, Lambda probe 1
fault code 16514
|
|
16535
Bank 2 - Probe 1
|
|
|
|
|
|
Voltage too low
|
=>Bank 1, Lambda probe 1
fault code 16515
|
=>Bank 1, Lambda probe 1
fault code 16515
|
=>Bank 1, Lambda probe 1
fault code 16515
|
|
16536
Bank 2 - Probe 1
|
|
|
|
|
|
Voltage too high
|
=>Bank 1, Lambda probe 1
fault code 16516
|
=>Bank 1, Lambda probe 1
fault code 16516
|
=>Bank 1, Lambda probe 1
fault code 16516
|
|
16538
Bank 2 - Probe 1
|
|
|
|
|
|
No activity
|
=>Bank 1, Lambda probe 1
fault code 16518
|
=>Bank 1, Lambda probe 1
fault code 16518
|
=>Bank 1, Lambda probe 1
fault code 16518
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16705
|
|
|
|
|
Engine speed sender
-G28
|
|
|
|
|
|
Implausible signal
|
- Engine speed sender -G28 loose
- Sender wheel loose
|
- Engine misfires
|
- Test engine speed sender -G28
|
Note on fault code 16705:
-
◆ When the number of signals per crankshaft rotation starting from the reference mark gap is incorrect (60 signals), the fault "Implausible signal" will be set.
-
◆ To obtain a specific gap between G28 and sender wheel, G28 has a spacer washer.
If the speed sender is fitted without the spacer washer the sender wheel will be severely damaged.
-
◆ Metal particles can cause additional signals to be generated.
-
◆ Signals may not be generated or be too small and therefore not recognised if the sender gap to sender wheel is too large or the sender wheel is damaged.
-
◆ The signals can be irregular if the sender wheel is loose.
-
◆ Interference signals can cause additional signals to be recognised.
|
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
|
- Read measured value block, Display Group 001
|
|
|
|
- -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
|
|
|
|
- Knock sensor defective
|
|
- Test knock sensor
=> Page 28-27
|
|
|
|
- Open circuit or short to earth in signal wire (or short circuit to screening for signal wire) between knock sensor and engine control unit
|
|
- Read measured value block 017 and 018
=> Page 01-140
|
|
|
|
- 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
|
|
16712
|
|
|
|
|
Knock sensor 1 -G61
|
|
|
|
|
|
Signal too great
|
- Knock sensor loose or
- corrosion on plug
|
- High fuel consumption
|
- Tightening torque for knock sensor: 20 Nm
|
|
|
|
- Knock sensor defective
|
|
- Test knock sensor
=> Page 28-27
|
|
|
|
- Possible engine damage
|
- Loss of power
|
|
|
16716
|
|
|
|
|
Knock sensor 2 -G66
|
|
|
|
|
|
Signal too small
|
=> Knock sensor 1 -G61
fault code 16711
|
=> Knock sensor 1 -G61
fault code 16711
|
=> Knock sensor 1 -G61
fault code 16711
|
|
16717
|
|
|
|
|
Knock sensor 2 -G66
|
|
|
|
|
|
Signal too great
|
=> Knock sensor 1 -G61
fault code 16712
|
=> Knock sensor 1 -G61
fault code 16712
|
=> Knock sensor 1 -G61
fault code 16712
|
|
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 value
|
- Read measured value block, Display Group 011, display zone 3
=> Page 01-135
|
|
|
|
- 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 24-107
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
16989
|
|
|
|
|
Control unit defective
|
|
|
|
|
|
|
- Open circuit in earth
- connections to control unit
|
- Engine will not start
|
- Check earth connections using current flow diagram
|
|
|
|
- Engine control unit
- defective
|
|
- Fit a new engine control unit => Page 24-26
|
|
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 28-27
|
|
|
- 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 017 and 018 => Page 01-140
|
|
|
|
- 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
|
|
17737
|
|
|
|
|
Knock control Cyl. 5
|
|
|
|
|
|
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
|
|
17738
|
|
|
|
|
Knock control Cyl. 6
|
|
|
|
|
|
Control limit reached
|
=> Knock control Cyl. 1
fault code 17733
|
=> Knock control Cyl. 1
fault code 17733
|
=> Knock control Cyl. 1
fault code 17733
|
|
17745
Bank 1, Camshaft pos. sensor -G163
|
|
|
|
|
|
Short circuit to earth
|
- Short to earth in wiring
- between Hall sender
- -G163 and engine
- control unit
|
- No power at full throttle
- Emission values not OK
- High fuel consumption
|
- Rectify short using current flow diagram
|
|
|
|
- -G163 defective
- Faulty signal input in
- engine control unit (engine control unit defective)
|
(Effects only likely to occur if -G40 and -G163 both fail at the same time)
|
- Test -G163
|
Note on fault code 17745:
If fault "17799" is also stored in the fault memory with fault "17745", the fault "17799" could be a knock-on fault. In this case begin the fault finding with fault "17745".
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17746
Bank 1, Camshaft pos. sensor -G163
|
|
|
|
|
|
Open/short circuit to positive
|
- Open circuit or short to positive in signal wire
- between Hall sender
- -G163 and engine
- control unit
|
- No power at full throttle
- Emission values not OK
- High fuel consumption
|
- Rectify open circuit or short using current flow diagram
|
|
|
|
- Fault in power supply or earth connection to -G163
- -G163 defective
|
(Effects only likely to occur if -G40 and -G163 both fail at the same time)
|
- Test -G163
|
|
|
|
- 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
|
|
17799
Bank 2, Camshaft pos. sensor -G40
|
|
|
|
|
|
Short circuit to earth
|
- Short to earth in wiring
- between Hall sender -G40 and engine control unit
|
- No power at full throttle
- Emission values not OK
- High fuel consumption
|
- Rectify short using current flow diagram
|
|
|
|
- -G40 defective
- Faulty signal input in
- engine control unit
- (control unit defective)
|
(Effects only likely to occur if -G40 and -G163 both fail at the same time)
|
- Test -G40
|
Note on fault code 17799:
If fault "17745" is also stored in the fault memory with fault "17799", the fault "17799" could be a knock-on fault. In this case begin the fault finding with fault "17745".
|
|
|---|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17800
Bank 2, Camshaft pos. sensor -G40
|
|
|
|
|
|
Open/short circuit to positive
|
- Open circuit or short to positive in signal wire
- between Hall sender -G40 and engine control unit
|
- No power at full throttle
- Emission values not OK
- High fuel consumption
|
- Rectify open circuit or short using current flow diagram
|
|
|
|
- Fault in power supply or earth connection to -G40
- -G40 defective
|
(Effects only likely to occur if -G40 and -G163 both fail at the same time)
|
- Test -G40
|
|
|
|
- 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
|
|
17829
Secondary air inlet valve
-N112
|
|
|
|
|
|
Short circuit to earth
(Fault only occurs on vehicles with secondary air system)
|
- Short to earth in wiring
- between secondary air inlet valve -N112 and
- engine control unit
|
|
- Test secondary air system
=> Final control diagnosis, Page 01-79
|
|
|
|
- -N112 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
|
|
17830
Secondary air inlet valve
-N112
|
|
|
|
|
|
Short circuit to
positive
(Fault only occurs on vehicles with secondary air system)
|
- Short to positive in wiring between secondary air inlet valve -N112 and
- engine control unit
|
|
- Test secondary air system
=> Final control diagnosis, Page 01-79
|
|
|
|
- -N112 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
|
|
17840
Secondary air inlet valve
-N112
|
|
|
|
|
|
Open circuit
(Fault only occurs on vehicles with secondary air system)
|
- Open circuit in wiring
- between secondary air inlet valve -N112 and
- engine control unit
|
|
- Test secondary air system
=> Final control diagnosis, Page 01-79
|
|
|
|
- Fault in power supply to
- -N112
|
|
|
|
|
|
- -N112 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
|
|
17841
Relay for secondary air pump -J299
|
|
|
|
|
|
Open circuit
(Fault only occurs on vehicles with secondary air system)
|
- Open circuit in wiring
- between secondary air pump relay -J299 and
- engine control unit
|
|
- Test secondary air system
=> Final control diagnosis, Page 01-79
|
|
|
|
- Fault in power supply to
- -J299
|
|
|
|
|
|
- -J299 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
|
|
17842
Relay for secondary air pump -J299
|
|
|
|
|
|
Short circuit to
positive
(Fault only occurs on vehicles with secondary air system)
|
- Short to positive in wiring between secondary air pump relay -J299 and
- engine control unit
|
|
- Test secondary air system
=> Final control diagnosis, Page 01-79
|
|
|
|
- -J299 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
|
|
17843
Relay for secondary air pump -J299
|
|
|
|
|
|
Short circuit to earth
(Fault only occurs on vehicles with secondary air system)
|
- Short to earth in wiring
- between secondary air pump relay -J299 and
- engine control unit
|
|
- Test secondary air system
=> Final control diagnosis, Page 01-79
|
|
|
|
- -J299 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
|
|
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 24-94
|
|
|
|
- Throttle cable setting
- Floor mat is pressing down on accelerator pedal
|
- Idling speed is outside the specified range
|
- Adjust throttle 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 plug
|
- Idling speed closed-loop control switches to
- open-loop control
|
- Test idling speed switch
=> Page 24-94
|
|
|
|
- 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
|
|
17920
Intake manifold change-over 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 24-54
|
|
|
|
- -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 change-over valve -N156
|
|
|
|
|
|
Short circuit to earth
|
- Short to earth in wiring
- between intake manifold change-over valve -N156 and engine control unit
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- -N156 does not open (loss of power above 4700 rpm)
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- Test -N156
=> Page 24-54
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- -N156 defective
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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
|
Fault remedy
|
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17924
Intake manifold change-over valve -N156
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Open circuit
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- Open circuit in wiring
- between intake manifold change-over valve -N156 and engine control unit
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- -N156 does not open (loss of power above 4700 rpm)
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- Test -N156
=> Page 24-54
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- Fault in power supply to
- -N156
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- -N156 defective
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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
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
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17953
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Throttle valve control
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Faulty
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- Fault in power supply or earth connection for throttle valve potentiometer -G69 and throttle valve positioner sender
- -G127
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- Increased idling speed
- Load change jolt when easing off accelerator
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- Read measured value block, Display Group 023
=> Page 01-145
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- Open circuit in signal wire for -G69 and -G127
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- Test throttle valve control part -J338
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- -G69 and -G127 defective
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- Throttle valve stiff or dirty
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Note on fault code 17953:
If other faults are stored in the fault memory which affect the throttle valve control part, e.g. the fault "00670", the fault "17953" could be a knock-on fault. In this case begin fault finding with the other faults.
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V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
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17967
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Throttle valve control part -J338
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Fault in basic setting
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- Voltage at engine control unit dropped below 10 V during adaption of throttle valve control part -J338 to engine control unit
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- Read measured value block, Display Group 003, display zone 2
=> Page 01-115
Test voltage supply to
engine control unit
=>Page 28-24
Check battery charge level
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Notes:
-
◆ Important: Before attempting to repair the above fault, check the notes on the next page. On vehicles with control units programmed with software version D08 or higher (Part No. 4D0 907 551) the possible causes of this fault are different.
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◆ To find out what software version the control unit has, check the control unit identification.
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17967
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Throttle valve control part -J338
|
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Fault in basic setting
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- Conditions for basic setting (i.e. adaption of throttle valve control unit) were
- violated during adaption process:
Driver applied throttle
during adaption process (idling speed switch opened)
Driver started engine
during adaption process (engine speed signal
detected)
|
- The engine control unit cannot learn the limit stop positions of the throttle valve control part because the basic setting (adaption) conditions were violated.
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- Ensure that conditions for basic setting (adaption of throttle valve control part) have been met; check learning requirement
display =>Page 01-145
Repeat adaption of throttle valve control part
=>Page 24-91
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Notes:
-
◆ Check the control unit identification to find out what software version the control unit has.
-
◆ Control units with software versions up to D08 will store the fault "Throttle valve control part -J338; Fault in basic setting" if the voltage at the engine control unit falls below 10 V during the adaption of the throttle valve control part. (Further notes=>next page.)
Continued:
-
◆ Control units with software version D08 or higher will store the fault if the conditions for the basic setting (adaption of throttle valve control part) are violated during the adaption process (see previous page).
-
◆ The software has now been updated to include a new fault code which will appear if the voltage falls below 10 V during the adaption process. This makes it easier to identify the exact cause of the problem.
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
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17972
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|
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Throttle valve control part -J338
|
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Low voltage at basic setting
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- Voltage at engine control unit fell below 10 V during adaption of throttle valve control part -J388
|
- The engine control unit cannot learn the limit stop positions of the throttle valve control part.
|
- Test voltage supply to
engine control unit
=>Page 28-24
Check battery charge level
Repeat adaption of throttle valve control part
=>Page 24-91
|
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V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
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17973
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Throttle valve control part -J338
|
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Lower stop is not
reached
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- Throttle cable incorrectly set
- Throttle valve dirty or stiff
- Floor mat pressing down on accelerator pedal
- Throttle valve control part defective
|
- The engine control unit cannot learn the limit stop positions of the throttle valve control part.
|
- Check and adjust throttle cable setting
|
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V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
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17978
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Engine control unit blocked
|
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- Attempted tampering
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- Engine starts but cuts out again immediately
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- Check that keys are
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- Short circuit in signal wire
- Immobilizer control unit
- defective/missing
|
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- Interrogate fault memory
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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
|
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18010
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Voltage supply
terminal 30
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Voltage too low
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- Battery was disconnected
|
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- Test power supply to
engine control unit
=> Page 28-24
|
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- Permanent power supply to control unit was
- disconnected, or open
- circuit
|
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|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
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18020
|
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Engine control unit
incorrectly coded
|
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- Engine control unit
- incorrectly coded
|
- Engine running problems
- Increased emissions
- Various faults stored in fault memory
|
- Code control unit
=> Page 01-90
|
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- Vehicle has front-wheel drive with ASR but control unit is coded for four-wheel drive
|
- ASR not working
- ASR warning lamp lights up
|
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
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18034
|
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CAN-Bus
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Message missing 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 CAN bus
=> Page 24-121
|
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18259
|
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CAN-Bus
|
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Message missing from ABS CU
|
- Fault in data transmission wires to ABS control unit
|
- Electronic stability program (ESP) not functioning
|
- Test CAN bus
=> Page 24-121
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