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Self-diagnosis
Fault table
Notes:
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◆ If faults occur in the sensors and components being monitored, they will be stored in the fault memory together with an indication of the type of fault.
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◆ The fault table is arranged according to the 5-digit fault codes in the left-hand column.
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◆ Sporadically occurring faults (temporary faults) will be indicated on the V.A.G 1551 display as "SP".
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◆ If a fault is stored in the fault memory and then does not occur again during the next 50 engine warm-up phases, the fault code will be automatically erased.
-
◆ 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.
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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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16485 P0101
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Air mass meter -G70
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Implausible signal
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- Air mass meter defective
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- Loss of power, jolting
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- Test air mass meter
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- Engine has been stalled (within the last 50 starts)
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- Erase fault memory and continue to monitor vehicle
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- Battery low
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- Loss of power
- Constant air mass readout in measured value block
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- Test battery
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- Sporadic open circuit in wiring to needle lift sender -G80 (break in wiring)
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- Misfiring, jolting
- Fault reading: Needle lift sender open circuit/short to positive might be displayed
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- Test needle lift sender => Page 23-71
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- Air cleaner blocked
- Vacuum hose system for exhaust gas recirculation incorrectly connected, or mechanical exhaust gas recirculation valve constantly open
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- Rough idling, loss of power
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- Test intake system
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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 P0321
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Engine speed sender -G28
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Implausible signal
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- Sender disc bent or loose
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- Engine stops
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- Remove sump and check sender disc
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- -G28 defective
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- Engine stops
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- Test engine speed sender => Page 23-64
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- Open circuit in screening
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16706P0322
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Engine speed sender -G28
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No signal
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- -G28 defective
- Open circuit or short
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- Check engine speed sender => Page 23-64
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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 P0501
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Road speed signal
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Implausible signal
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- Open circuit between speedometer sender -G22 and dash panel insert
- -G22 defective
- Speedometer -G21 defective
- Open circuit between dash panel insert and engine control unit
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- Cruise control not working
- Air conditioner not working
- Load change jolts
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- Test speed signal
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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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16955 P0571
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Brake light switch -F
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Implausible signal
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- Switch incorrectly set
- Open circuit
- -F or -F47 defective
- Fuse defective
- Both brake lights defective
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- No throttle response at times, complete loss of power
- Glow period warning lamp flashes
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- Test and adjust -F and -F47
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16989 P0605
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Control unit defective
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- Internal fault in control unit
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- Engine running problems
- Engine will not run
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- Fit a new control unit
=> Page 23-49
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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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17552 P1144
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Air mass meter -G70
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Open/short circuit to earth
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- -G70 defective
- Open circuit or short to earth
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- Loss of power
- Black exhaust smoke possible when accelerating from low engine speeds
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- Test air mass meter
=> Page 23-66
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17553 P1145
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Air mass meter -G70
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Short circuit to positive
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- -G70 defective
- Short circuit to positive
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- Loss of power
- Black exhaust smoke possible when accelerating from low engine speeds
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- Test air mass meter
=> Page 23-66
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17554 P1146
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Air mass meter -G70
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Voltage supply
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- Open circuit or short circuit
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- Loss of power
- Black exhaust smoke possible when accelerating from low engine speeds
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- Test air mass meter
=> Page 23-66
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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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17563 P1155
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Intake manifold pressure sender -G71
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Short circuit to positive
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- Open circuit or short
- -G71 defective
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- Loss of power
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- Test intake manifold pressure sender
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17564 P1156
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Intake manifold pressure sender -G71
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Open/short circuit to earth
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- Open circuit
- -G71 defective
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- Loss of power
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- Test intake manifold pressure sender
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17565 P1157
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Intake manifold pressure sender -G71
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Voltage supply
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- Open circuit or short
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- Loss of power
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- Test intake manifold pressure sender
=>4-Cyl. Diesel direct injection engine (TDI), Mechanics; Repair group 21
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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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17568P1160
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Intake manifold temperature sender -G72
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Short circuit to earth
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- -G72 defective
- Short to earth
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- Engine pre-heating not working
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- Test intake manifold temperature sender
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17569 P1161
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Intake manifold temperature sender -G72
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Open/short circuit to positive
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- -G72 defective
- Open circuit or short to positive
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- Engine pre-heating not working
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- Test intake manifold temperature sender
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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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17570 P1162
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Fuel temperature sender -G81
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Short circuit to earth
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- -G81 defective
- Short circuit to earth
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- Reduced power
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- Test fuel temperature sender
=> Page 23-56
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17571 P1163
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Fuel temperature sender -G81
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Open/short circuit to positive
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- -G81 defective
- Open circuit or short to positive
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- Reduced power
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- Test fuel temperature sender
=> Page 23-56
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- Plug for injection pump disconnected
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- Several faults recorded
- Engine stops
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- Check injection pump connection
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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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17653 P1245
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Needle lift sender -G80
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Short circuit to
earth
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- -G80 defective
- Short circuit
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- Glow period warning lamp lights up
- Engine running rough
- Reduced power
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- Test needle lift sender
=> Page 23-71
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17654 P1246
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Needle lift sender -G80
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Implausible signal
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- Fuel feed interrupted (intermittently); tank was run dry, supply pipe or filter blocked, air entering fuel system
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- Fault 17656 (Commencement of injection control; Control difference) may be recorded
- Misfiring, jolting
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- Check fuel system
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- (Sporadic) open circuit in wiring to fuel cut-off valve
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- Engine stops
- Misfiring
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- Check wiring and plug connections to injection pump
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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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17654 P1246
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Needle lift sender -G80
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Implausible signal
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- Sender disc of engine speed sender is bent or loose
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- Misfiring at exactly 3000 rpm
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- Remove sump and check sender disc
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- -G80 defective
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- Misfiring, jolting (especially at high engine speeds)
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- Fit a new needle lift sender
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- Injection pump defective
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- Fault 17969 recorded (Quantity adjuster; Control difference)
- Engine running rough, misfiring
- No throttle response after overrun
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- Fit a new injection pump
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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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17655 P1247
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Needle lift sender -G80
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Open/short circuit to positive
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- -G80 defective
- Open circuit or short circuit
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- Glow period warning lamp lights up
- Engine running rough
- Reduced power
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- Test needle lift sender
=> Page 23-71
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- Sporadic open circuit (break in wiring)
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- Misfiring, jolting
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17656 P1248
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Injection commencement regulation
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Regulating difference
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- Start of delivery not OK
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- Loss of power at high engine speeds
- Engine difficult to start
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- Check and adjust commencement of injection
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- Control range of injection pump blocked (dirt, metal particles)
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- Loss of power at high engine speeds
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- Check control range of injection timing control
=> Page 23-51
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- Engine has been stalled (within the last 50 starts)
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- Erase fault memory and continue to monitor vehicle
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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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17656 P1248
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Injection commencement regulation
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Control difference
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- Fuel feed interrupted (intermittently); tank was run dry, supply pipe or filter blocked, air entering fuel system
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- Fault 17654 (implausible signal for needle lift sender) may be have been recorded
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- Check fuel system
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- Open circuit in wiring to commencement of injection valve -N108
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- Engine knocks when idling because commencement of injection is constantly advanced
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- Test commencement of injection valve => Page 23-53
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- Several faults may have been recorded
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- Test 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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17659 P1251
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Commencement of injection valve -N108
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Short circuit to positive
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- Short circuit to positive
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- Engine knocks when idling because commencement of injection is constantly advanced
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- Test commencement of injection valve
=> Page 23-53
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17660 P1252
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Commencement of injection valve -N108
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Open/short circuit to earth
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- Open circuit (fuse)
- Valve defective
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- Engine knocks when idling because commencement of injection is constantly advanced
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- Test commencement of injection valve => Page 23-53
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- Several faults may be recorded
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- Test fuse
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- Short circuit to earth
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- Loss of power because commencement of injection is constantly retarded
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- Test commencement of injection valve => Page 23-53
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V.A.G 1551 print-out
|
Possible causes of fault
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Possible effects
|
Fault remedy
|
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17663 P1255
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Coolant temperature sender -G62
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Short circuit to earth
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- -G62 defective
- Short to earth
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- Black exhaust smoke when starting
- Engine pre-heating not functioning
- Glow period always approx. 20 seconds
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- Test coolant temperature sender
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17664 P1256
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Coolant temperature sender -G62
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Open/short circuit to positive
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- -G62 defective
- Open circuit or short to positive
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- Black exhaust smoke when starting
- Engine pre-heating not functioning
- Glow period always approx. 20 seconds
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- Test coolant temperature sender
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V.A.G 1551 print-out
|
Possible causes of fault
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Possible effects
|
Fault remedy
|
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17762 P1354
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Modulating piston movement sender -G149
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- Connector for injection pump disconnected
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- Several faults recorded
- Engine will not run
|
- Check connector for injection pump
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- Injection pump defective
- Open circuit or short circuit
|
- Engine running problems
- Engine will not run
|
- Test modulating piston movement sender
=> Page 23-77
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17795 P1387
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Control unit defective
|
- Internal fault in control unit
|
- Engine running problems
- Engine will not run
|
- Fit a new control unit
=> Page 23-49
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
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17810 P1402
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Exhaust gas recirculation valve -N18-
|
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Short circuit to positive
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- Short circuit to positive
|
- No exhaust gas recirculation
|
- Test exhaust gas recirculation valve
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17849 P1441
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Exhaust gas recirculation valve -N18-
|
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Open/short circuit to earth
|
- Open circuit
- Solenoid defective
|
- No exhaust gas recirculation
|
- Test exhaust gas recirculation valve
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- Short circuit to earth
|
- Too much exhaust gas recirculation
- Reduced power, black exhaust smoke
|
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17911 P1503
|
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Load signal for alternator terminal DF
|
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Implausible signal
|
- Open circuit or short circuit
|
- Engine pre-heating not working
|
- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations binder
|
|
17931 P1523
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Crash signal from airbag CU
|
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Implausible signal
|
- Open circuit or short circuit
|
|
- Test crash signal =>Carry out final control diagnosis in airbag control unit
Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations binder
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17945 P1537
|
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Fuel cut-off valve -N109
|
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Mechanical fault
|
- N109 defective, leaking or sticking
|
- Reduced output
- Engine will not start
|
- Check N109
, Final control diagnosis
|
|
17946 P1538
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Fuel cut-off valve -N109
|
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Open/short circuit to earth
|
- -N109 defective
- Open circuit in wiring or short circuit to earth
|
- Engine stops
|
- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17948 P1540
|
|
|
|
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Road speed signal
|
|
|
|
|
|
Signal too high
|
- -G22 defective
- Speedometer -G21 defective
|
- Cruise control not working
- Air conditioner not working
- Load change jolts
|
- Test speed signal
|
|
17954 P1546
|
|
|
|
|
Charge pressure control solenoid valve -N75
|
|
|
|
|
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Short circuit to positive
|
- Short circuit to positive
|
- Reduced power
- Boost pressure too low
|
- Test charge pressure control solenoid valve
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17957 P1549
|
|
|
|
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Charge pressure control solenoid valve -N75
|
|
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Open/short circuit to earth
|
- Open circuit
- Solenoid defective
|
- Reduced power
- Boost pressure too low
|
- Test charge pressure control solenoid valve
|
|
|
|
- Short circuit to earth
|
- Reduced power
- Boost pressure too high
|
|
|
17964 P1556
|
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|
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|
Charge pressure control
|
|
|
|
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|
Regulating limit not reached
|
- Hoses wrongly connected, disconnected, blocked or leaking
- Pressure unit for turbocharger defective
- Solenoid valve for charge pressure control -N75 defective
|
- Sudden complete loss of power
- Reduced power
|
- Test charge pressure
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17965 P1557
|
|
|
|
|
Charge pressure control
|
|
|
|
|
|
Regulating limit surpassed
|
- Hoses wrongly connected, disconnected, blocked or leaking
- Pressure unit for turbocharger defective
- Solenoid valve for charge pressure control -N75 defective
|
- Sudden complete loss of power
- Reduced power
|
- Test charge pressure
|
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17969 P1561
|
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|
|
|
Metering device -N146
|
|
|
|
|
|
Regulating difference
|
- Injection pump defective
- Open circuit or short circuit
|
- Engine running problems
- Engine stops
|
- Test quantity adjuster
Fit a new injection pump
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17970 P1562
|
|
|
|
|
Metering device -N146
|
|
|
|
|
|
Upper stop value
|
- Quantity adjuster incorrectly set
|
- Engine stops (safety cut-out)
|
- Test quantity adjuster
Replace injection pump
|
|
17971 P1563
|
|
|
|
|
Metering device -N146
|
|
|
|
|
|
Lower stop value
|
- Quantity adjuster incorrectly set
|
- Engine stops (safety cut-out)
|
- Test quantity adjuster
Replace injection pump
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
17977 P1569
|
|
|
|
|
CCS Switch -E45
|
|
|
|
|
|
Implausible signal
|
- Cruise control system switch -E45 defective
- Open circuit or short in wiring
|
- Cruise control system switched off
|
- Test cruise control system
|
|
17978
|
|
|
|
|
Engine control unit blocked
|
|
|
|
|
|
- Attempted tampering
|
- Engine starts but cuts out again immediately
|
- Adapt control unit for engine electronics to electronic immobilizer
|
|
|
|
- Short in the communication wire
|
|
- Check electronic immobilizer:
=> Repair group 96; Servicing electronic immobilizer
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18008 P1600
|
|
|
|
|
Voltage supply,
terminal 15
|
|
|
|
|
|
Voltage too low
|
- Control unit was connected while ignition was switched on
|
|
- Erase fault memory and continue to monitor vehicle
|
|
|
|
- Open circuit or short
|
- Engine will not start
- Engine stops
|
- Test power supply to diesel direct injection system
|
|
18009 P1601
|
|
|
|
|
Vehicle voltage
terminal 30
|
|
|
|
|
|
Implausible signal
|
- Relay for diesel direct injection system -J322 sticking
|
- Engine will not start (safety cut-out)
|
- Check power supply to diesel direct injection system
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18020 P1612
|
|
|
|
|
Engine control unit
|
|
|
|
|
|
Wrong coding
|
- Invalid control unit coding
|
- Glow period warning lamp flashes
|
- Code control unit
=> Page 01-58
|
|
18026 P1618
|
|
|
|
|
Glow plug relay -J52
|
|
|
|
|
|
Short circuit to positive
|
- Short circuit to positive
|
- Glow plug system not working
|
- Test wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18027 P1619
|
|
|
|
|
Glow plug relay -J52
|
|
|
|
|
|
Open/short circuit to earth
|
- Open circuit
- Relay defective
|
- Glow plug system not working
|
- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations
|
|
|
|
- Short circuit to earth
|
- Glow plug system remains on constantly
|
|
|
18034 P1626
|
|
|
|
|
Drive train data bus
|
|
|
|
|
|
No message from gearbox CU
|
- Open circuit in wiring to gearbox CU
|
- Gearbox in emergency running mode
|
- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18039 P1631
|
|
|
|
|
Accelerator position sender -G79
|
|
|
|
|
|
Signal too high
|
- Open circuit or short circuit to positive
- -G79 defective
|
- Safety governing at approx. 1100 rpm
- No throttle response
|
- Test accelerator position sender
|
|
18040 P1632
|
|
|
|
|
Accelerator position sender -G79
|
|
|
|
|
|
Voltage supply
|
- Open circuit or short circuit
|
- Safety governing at approx. 1100 rpm
- No throttle response
|
- Test accelerator position sender
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18044 P1636
|
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Drive train data bus
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No message from airbag CU
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- Open circuit in wiring to airbag CU
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- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations binder
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18047 P1639
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Accelerator position sender -G79 + G185
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Implausible signal
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- Open circuit
- -G79 defective (idling speed switch)
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- Safety governing at approx. 1100 rpm
- No throttle response
|
- Test accelerator position sender
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V.A.G 1551 print-out
|
Possible causes of fault
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Possible effects
|
Fault remedy
|
|
18048 P1640
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Control unit defective
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- Internal fault in control unit
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- Engine running problems
- Engine will not run
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- Fit a new control unit
=> Page 23-49
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18050 P1642
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Please interrogate fault memory of airbag CU
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- Fault in airbag system
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- Investigate and eliminate cause of fault in airbag system
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18056 P1648
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Drive train data bus
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Hardware defective
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- Open circuit or short circuit to earth/positive
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- Engine running problems
|
- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations binder
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18057 P1649
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Drive train data bus
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Message from ABS control unit missing
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- Open circuit in wiring to ABS control unit
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- ASR warning lamp (traction control system) lights up
- Traction control system (ASR) not working
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- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations binder
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18058 P1650
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Drive train data bus
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Message from combi-instrument missing
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- Open circuit in wiring to combi-instrument (dash panel insert)
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|
- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations binder
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18062 P1654
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|
Please interrogate fault memory of combi-instrument
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- Fault in combi-instrument (dash panel insert)
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- Investigate and eliminate cause of fault in combi-instrument (dash panel insert)
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18067 P1659
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Activation 1 for radiator fan
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Short to positive
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- Short to positive
|
- Fan run-on not working
|
- Test radiator fan run-on control unit -J138
=> Current flow diagrams, Electrical fault-finding and Fitting locations binder
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
18080 P1672
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|
|
|
|
Activation 1 for radiator fan
|
|
|
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Open /short circuit to earth
|
- Open circuit
- Relay defective
|
- Fan run-on not working
|
- Test radiator fan run-on control unit -J138
=> Current flow diagrams, Electrical fault-finding and Fitting locations binder
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- Short circuit to earth
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- Radiator fan remains on constantly
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18090 P1682
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|
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Drive train data bus
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|
|
|
|
|
Implausible signal from ABS CU
|
- Signal malfunction
|
- ASR warning lamp (traction control system) glows
- Traction control system (ASR) not working
|
- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations binder
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
19458 P3002
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|
|
|
|
Kick-down switch -F8
|
|
|
|
|
|
Implausible signal
|
- Open circuit
- -G79 defective (kick-down switch)
|
|
- Test accelerator position sender
|
|
19459 P3003
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|
|
|
|
Low heating output relay -J359
|
|
|
|
|
|
Short circuit to positive
|
- Short circuit to positive
|
- Engine pre-heating not working
|
- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations binder
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
19460 P3004
|
|
|
|
|
Low heating output relay -J359
|
|
|
|
|
|
Open/short circuit to earth
|
- Open circuit in wiring
- Low heating output relay -J359 defective
|
- Engine pre-heating not working
|
- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations
|
|
|
|
- Short circuit to earth
|
- Engine pre-heating remains on constantly
|
|
|
19461 P3005
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|
|
|
|
High heating output relay -J360
|
|
|
|
|
|
Short circuit to positive
|
- Short circuit to positive
|
- Engine pre-heating not working
|
- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations
|
|
V.A.G 1551 print-out
|
Possible causes of fault
|
Possible effects
|
Fault remedy
|
|
19462 P3006
|
|
|
|
|
High heating output relay -J360
|
|
|
|
|
|
Open/short circuit to earth
|
- Open circuit
- High heating output relay -J360 defective
|
- Engine pre-heating not working
|
- Check wiring
=> Current flow diagrams, Electrical fault-finding and Fitting locations
|
|
|
|
- Short circuit to earth
|
- Engine pre-heating remains on constantly
|
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|
