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Fault table, fault codes 16486...18034
Fault table, fault codes 16486...18034
Notes on fault table
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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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16486
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Air mass meter -G70
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Signal too small
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- Unmetered air between G70 and engine
- Fault in the voltage supply to G70
- Wiring open circuit or short to earth in the signal wire between G70 and engine control unit (J220)
- G70 defective
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- Emergency running (replacement value from throttle valve angle and engine speed), therefore the driving characteristics will not change noticeably
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- Locate and eliminate leaks
Check G70
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- Signal input in engine control unit defective (control unit defective)
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- Air cleaner blocked
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- Renew air filter element
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- Fuse 14 defective
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- Check fuse
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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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16487
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Air mass meter -G70
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Signal too great
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- Short to positive in the signal wire between G70 and engine control unit (J220)
- Fault in the earth for G70
- G70 defective
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- Emergency running (replacement value from throttle valve angle and engine speed), therefore the driving characteristics will not change noticeably
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- Check G70 => Page 24-25
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- Signal input in engine control unit defective (control unit defective)
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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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16496
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Intake air temperature sender -G42
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Signal too small
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- Short to earth in the wiring between G42 and engine control unit (J220)
- G42 defective
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- Emergency running (replacement value constant 19.5 °C)
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- Check G42
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- Signal input in engine control unit defective (control unit defective)
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Note on fault code 16496:
The fault "Signal too small" will be stored at idling speed approx. 3 minutes after starting.
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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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16497
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Intake air temperature sender -G42
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Signal too large
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- Wiring open circuit or short to positive in the wiring between G42 and engine control unit (J220)
- G42 defective
- Fault in earth to G42
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- Emergency running (replacement value constant 19.5 °C)
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- Check G42
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- Signal input in engine control unit defective (control unit defective)
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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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16500
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Coolant temperature sender -G62
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Implausible signal
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- G62 supplies an implausible signal due to loose contact or corrosion caused by moisture in connector
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- Cold starting problems at very low temperatures
- Handling problems in warm-up phase
- Increased fuel consumption
- Increased exhaust gas emissions
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- Check G62
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- Signal input in engine control unit defective (control unit defective)
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- Coolant thermostat defective
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- Check coolant thermostat:
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Note on fault code 16500:
A comparison is carried out in the range from 20 °C to 60 °C with a model path which is stored in the control unit. The model path increases slower than the real value. If the real values are too slow because of a fault at some time the real value and the model value will correspond with each other. The engine control unit will recognise this fault at not plausible.
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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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16501
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Coolant temperature sender -G62
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Signal too small
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- Short to earth in the wiring between G62 and engine control unit (J220)
- G62 defective
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- Cold starting problems at very low temperatures
- Handling problems in warm-up phase
- Increased fuel consumption
- Increased exhaust gas emissions
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- Check G62
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- Signal input in engine control unit defective (control unit defective)
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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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16502
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Coolant temperature sender -G62
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Signal too great
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- Wiring open circuit or short to positive in the wiring between G62 and engine control unit (J220)
- G62 defective
- Fault in earth to G62
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- Cold starting problems at very low temperatures
- Handling problems in warm-up phase
- Increased fuel consumption
- Increased exhaust gas emissions
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- Check G62
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- Signal input in engine control unit defective (control unit defective)
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Note on fault codes 16500, 16501 and 16502:
The engine control unit will take the intake air temperature as a replacement value for starting engine (start temperature-replacement value) as soon as there is a fault in the fault memory and calculates the engine temperature according to a predetermined model (an increase of 5.25 °C every 65 seconds). After a certain period a fixed replacement value will be adopted when the engine has reached operating temperature. This fixed replacement value is also dependent on the intake air temperature.
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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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16505
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Throttle valve potentiometer -G691)
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Implausible signal
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- Moisture or corrosion in connector on G69
- G69 defective
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- Minor misfiring when accelerating
- Idling control characteristics unstable
- Load change jolt when decelerating
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- Check G69
, check throttle valve control part
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16506
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Throttle valve potentiometer -G691)
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Signal too small
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- Short to earth in signal wire between G69 and engine control unit (J220)
- Fault in voltage supply system for G69
- G69 defective
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- Minor misfiring when accelerating
- Load change jolt when decelerating
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- Check G69
, Checking throttle valve control part
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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
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Possible causes of fault
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Possible effects
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Fault remedy
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16507
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Throttle valve potentiometer -G691)
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Signal too large
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- Open circuit or short to positive in signal wire between G69 and engine control unit (J220)
- Fault in the earth for G69
- G69 defective
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- Minor misfiring when accelerating
- Load change jolt when decelerating
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- Check G69
, check throttle valve control part
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1) The throttle valve potentiometer (G69) is a component of the throttle valve control part (J338).
Note on fault code 16505:
The air throughput (air mass) is compared at the particular speed with the throttle valve angle.
Notes on fault codes 16505, 16505 and 16507:
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◆ As soon as a fault is recognised the control unit will use a replacement value worked out from the speed (rpm) and the air mass drawn in.
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◆ If a throttle valve potentiometer and air mass meter fault occur at the same time, an emergency running function is not possible. Result: Engine stops.
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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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16514
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Bank 1, probe 1
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Electrical fault in current circuit
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- Corrosion caused by moisture in the probe heating connector or Lambda probe (G39)
- Short between Lambda probes signal wire and Lambda probes earth wire
- Signal voltage amplitude too small (G39 contaminated or probe slots blocked, soiled)
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- Lambda regulation goes onto fixed settings
- Poor idling
- Exhaust emissions not OK.
- Increased fuel consumption
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- Check Lambda regulation
Rectify short or wiring open circuit using current flow diagram
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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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16515
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Bank 1, probe 1
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Voltage too low
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- Short to earth or screening in the Lambda probes signal wire
- Short to earth or screening in Lambda probes earth wire or to screening
- Lambda probe (G39) defective
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- Lambda regulation goes onto fixed settings
- Poor idling
- Emission figures not OK
- Increased fuel consumption
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- Check Lambda regulation
Rectify short or wiring open circuit using current flow diagram
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16516
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Bank 1, probe 1
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Voltage too great
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- Short to positive in the Lambda probes signal wire
- Short to positive in the Lambda probes earth wire
- Lambda probe (G39) defective
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- Lambda regulation goes onto fixed settings
- Poor idling
- Increased fuel consumption
- Spark plugs coke-up
- Emission figures not OK.
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- Check Lambda regulation
Rectify short or wiring open circuit using current flow diagram
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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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16518
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Bank 1, probe 1
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No activity
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- Corrosion caused by moisture in the probe heating connector or Lambda probe (G39)
- Wiring open circuit on Lambda probes signal wire
- Wiring open circuit in Lambda probes earth wire
- Probe heating not functioning
- Lambda probe (G39) defective
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- Lambda regulation goes onto fixed settings
- Poor idling
- Increased fuel consumption
- Emission figures not OK
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- Check Lambda regulation
Rectify short or open circuit using current flow diagram
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16519
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Bank 1, probe 1
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Electrical fault in heater current circuit
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- Wiring open circuit or short to earth
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- Lambda probe heating not functioning
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- Check Lambda probe heating
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- Fuse 14 defective
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- Check fuse
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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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16705
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Engine speed sender -G28
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Implausible signal
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- Metal particles on G28
- Gap from G28 to sender wheel larger than 2.3 mm
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- Engine misfires
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- Check G28
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Note on fault code 16705:
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◆ 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.
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◆ Metal particles can cause additional signals to be generated.
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◆ 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.
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◆ The signals can be irregular if the sender wheel is loose.
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◆ Interference signals can cause additional signals to be recognised.
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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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16706
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Engine speed sender -G28
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No signal
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- G28 defective
- Wiring to control unit has an:
- Open circuit
- Short to earth
- Short to positive
- Wiring open circuit in screening from G28
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- Engine will not start
- Engine stops
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- Check G28
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- Signal input in engine control unit defective (control unit defective)
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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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16711
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Knock sensor 1 -G61
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Signal too small
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- Knock sensor loose or corrosion on connector
- Wiring open circuit or short to positive or to signal wire screening between knock sensor and engine control unit (J220)
- Wiring open circuit in the sender earth wire between knock sensor and engine control unit (J220)
- Knock sensor defective
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- Too high fuel consumption
- Performance problems
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- Loosen G61 and tighten again to 20 Nm
Check knock sensor
=> Page 28-17
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- Signal input in engine control unit defective (control unit defective)
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16716
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Knock sensor 2 -G66
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Signal too small
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see fault code 16711, as per G66
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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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16885
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Vehicle speed signal
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Implausible signal
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- Speedometer sender (G22) defective
- Wiring open circuit or short between (G22) and speedometer (G21)
- G21 defective
- Wiring open circuit or short between dash panel insert and engine control unit (J220)
- Short in the signal wire between speedometer and another control unit which uses this speed signal
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- No air conditioner compressor switch-off in 1st gear at full throttle
- Idling speed briefly deviates from the specified revolutions
- Systems which use the speed signal not functioning correctly
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- Check speed signal => Page 24-117
Rectify wiring open circuit or short using current flow diagram
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- Signal input in engine control unit defective (control unit defective)
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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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16989
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Control unit defective
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- Open circuit in earth wiring to control unit (J220)
- Engine control unit defective
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- Engine will not start
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- Check earth connections according to current flow diagram
Renew engine control unit (J220) => Page 24-106
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17733
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Knock control No. 1 Cyl.
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Control limit reached
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- Poor fuel quality (less than 91 RON)
- Abnormal noises when engine is running (ancillaries loose, brackets/bolts broken/sheared)
- Wiring open circuit in screening from knock sensor 1
- Loose contacts in connectors
- Knock sensor tightened to incorrect torque
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- Higher fuel consumption
- Performance problems
- Engine runs rough
- Maximum speed cannot be reached
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- Fill tank with fuel of at least 91 RON
Rectify cause of abnormal noises when engine is running
Check knock sensor
=> Page 28-17
Rectify short or wiring open circuit using Current flow diagram
Loosen knock sensor and tighten again to 20 Nm
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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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17734
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Knock control No. 2 Cyl.
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Control limit reached
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see fault code 17733, for knock control No. 2 Cyl.
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17735
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Knock control No. 3 Cyl.
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Control limit reached
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see fault code 17733, for knock control No. 3 Cyl.
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17736
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Knock control No. 4 Cyl.
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Control limit reached
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see fault code 17733, for knock control No. 4 Cyl.
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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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17828
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Secondary air inlet valve -N112
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Electrical fault in current circuit
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- Secondary air inlet valve N112 defective
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- Emission figures not OK.
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- Check N112
=> Page 01-61, Final control diagnosis
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17829
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Secondary air inlet valve -N112
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Short to earth
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- Secondary air inlet valve N112 defective
- Short to earth
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- Emission figures not OK.
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- Check N112
=> Page 01-61, Final control diagnosis
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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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17830
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Secondary air inlet valve -N112
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Short to positive
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- Secondary air inlet valve N112 defective
- Short to positive
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- Emission figures OK.
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- Check N112
=> Page 01-61, Final control diagnosis
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17840
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Secondary air inlet valve -N112
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Open circuit
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- Secondary air inlet valve N112 defective
- Wiring open circuit
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- Emission figures OK.
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- Check N112
=> Page 01-61, Final control diagnosis
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- Fuse 14 defective
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- Check fuse
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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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17841
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Secondary air pump relay -J299
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Open circuit
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- Wiring open circuit
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- Emission figures not OK.
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- Check J299 => Page 01-61, Final control diagnosis
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- Fuse 14 defective
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- Check fuse
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17842
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Secondary air pump relay -J299
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Short to positive
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- Secondary air pump relay defective
- Short to positive
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- Emission figures not OK.
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- Check J299 => Page 01-61, Final control diagnosis
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17843
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Secondary air pump relay -J299
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Short to earth
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- Secondary air pump relay defective
- Short to earth
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- Emission figures not OK.
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- Check J299 => Page 01-61, Final control diagnosis
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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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17913
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Idling switch -F60
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Not closing/open circuit
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- Throttle valve sticking
- F60 defective
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- Load changes when lifting off throttle
- Idling speed not within specified range
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- Check F60
, Checking throttle valve control part
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- Throttle cable adjustment
- Floor mat pressing on accelerator pedal
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- Adjust accelerator cable
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- Wiring open circuit or short to positive between F60 and engine control unit (J220)
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- Rectify short or open circuit using current flow diagram
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- Signal input in engine control unit defective (control unit defective)
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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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17914
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Idling switch -F60
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Does not open/short to earth
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- Moisture in throttle valve control part (J338) connector
- Short to earth between F60 and engine control unit (J220)
- F60 defective
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- Idling control goes onto fixed settings
- Load change jolt when decelerating
- Idling speed is not within specifications
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- Check F60
, check throttle valve control part
Rectify short circuit using current flow diagram
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- Signal input in engine control unit defective (control unit defective)
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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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17953
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Throttle valve control
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Malfunction
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- Voltage supply or earth for throttle valve potentiometer (G69) and sender for throttle valve positioner (G127) defective
- Open circuit in the signal wire for G69 and G127
- G69 and G127 defective
- Positioner mechanics or throttle valve tight or sticking
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- Increased idling speed
- Load change jolt when decelerating
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- Check throttle valve control part=> Page 24-30
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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
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Possible causes of fault
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Possible effects
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Fault remedy
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17966
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Throttle valve drive
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Electrical fault in current circuit
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- Short to earth
- Short to positive
- Throttle valve positioner (V60) defective
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- Idling speed too high
- Air conditioner compressor will not switch in until 1520 rpm
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- Check throttle valve control part=> Page 24-30
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17967
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Throttle valve control part -J338
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Fault in the basic setting
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- The adaption of the engine control unit to the throttle valve control part has been interrupted. The cause could be e.g. that the starter or accelerator pedal was operated during the adaption procedure.
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- Idling speed not within tolerance range
- Idling speed fluctuates
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- Repeat the adaption of the engine control unit to the throttle valve control part => Page 24-111.
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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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17972
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Throttle valve control part -J338
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Insufficient voltage during basic settings
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- Less than 10 volts at engine control unit when matching engine control unit to throttle valve control part.
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- Idling speed not within tolerance range
- Idling speed fluctuates
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- Check battery charge condition
Check engine control unit voltage supply => Page 24-111.
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17973
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Throttle valve control part -J338
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Lower stop not reached
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- Throttle valve sticks
- Throttle valve positioner sticks/mechanically damaged
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- Starting problems
- Poor throttle responds
- Problems in driving off
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- Check throttle valve for damage or dirt.
Check throttle valve control part=> Page 24-30
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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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17978
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Engine control unit
blocked
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- Start attempted with a non-authorised key.
- Attempted manipulation
- Short in communication wire
- Incorrect coding
- Fault in immobilizer system
- Immobilizer control unit defective/missing
- Engine control unit has been replaced and not adapted to the immobilizer.
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- Engine starts briefly and then stops again
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- Adapt engine electronics control unit to electronic immobilizer => Page 24-114
Check electronic immobilizer:
=> Repair group 96; Servicing electronic immobilizer
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Note to fault code 17978:
If starting is attempted with a non-authorised key a statistical fault will be stored. After a subsequent start with an authorised key the fault will be converted to a sporadic fault.
Control unit for immobilizer is located behind combi instrument.
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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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18010
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Voltage supply terminal 30
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Voltage too low
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- Battery was disconnected
- Permanent voltage supply to control unit was disconnected or wiring open circuit
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- Engine control unit learnt values lost
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- Check engine control unit voltage supply => Page 24-104
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- Fuse 4 defective
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- Check fuse
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- Fuse 13 defective
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- Check fuse
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18020
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Engine control unit coding incorrect
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- Vehicles with automatic gearbox coded for manual gearbox
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- Handling problems (gearchange jerks, load change jolt)
- Increased exhaust emissions
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- Code engine control unit correctly => Page 24-108
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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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18034
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Data bus drive
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Communication from gearbox control unit missing
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- Fault in data wire to gearbox control unit
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- Driving characteristics (selector jolts, load change jolts)
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- Check data wire to engine control unit pin 29 + 41 for open or short circuit using current flow diagram:
=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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