Audi Workshop Service and Repair Manuals

Fault table: fault codes 00668...65535   Note t  If faults occur in the monitored sensors or components, these are stored in the fault memory together with an indication of the type of fault. t  The fault table is arranged according to the 5-digit fault codes in the left-hand column. t  Sporadically occurring faults (intermittent faults) will be indicated on the -V.A.G 1551- display as “SP” (sporadic). t  The components shown to be defective by the fault reader should not be replaced immediately. Start by using the current flow diagram to check the wiring and connectors to these components. Also test the earth connections using the current flow diagram. This is particularly important in the case of sporadic faults (indicated by the letters “SP” on the fault reader display). t  Erase fault memory after rectifying faults.

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00668
Vehicle voltage terminal 30
	Voltage supply too low	This fault message is stored if the voltage supply to the injection pump is less than 6 V or greater than 24 V.
		t  Voltage supply to injection pump too low (battery discharged) t  Poor wiring connection to injection pump	t  Engine will not start t  Engine running problems, possibly including engine cut-out	–  Check battery voltage –  Check voltage supply for diesel direct injection system → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00671
CCS switch -E45-
	Undefined switch position	t  E45 defective t  Open circuit or short circuit in wiring	t  Cruise control system switched off	–  Check cruise control system, read measured value block 6 → Chapter –  Check cruise control system → Electrical system; Rep. Gr.01 Checking cruise control system (CCS) - diesel engine

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00741
Brake pedal monitoring
	Implausible signal	This fault message is stored if the brake light switch signals “brake pedal pressed” but the brake pedal switch does not detect a pressed brake pedal, or vice versa
		t  Both brake lights defective t  Fuse defective t  Switch incorrectly set t  Open circuit in wiring t  Brake light switch -F or brake pedal switch -F47- defective	t  No throttle response at times, complete loss of power t  Glow period warning lamp flashes	–  Check brake light –  Check fuse –  Check brake light switch -F and brake pedal switch -F47- → Chapter –  Adjust brake light switch → Brake system; Rep. Gr.45

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00777
Accelerator pedal position sender -G79-
	Implausible signal	This fault message is stored if the idling speed switch indicates that the engine is idling but the potentiometer indicates that the accelerator is depressed (or vice versa)
		t  Open circuit in wiring t  -G79- defective	t  Increased idling speed t  No throttle response	–  Check accelerator position sender → Chapter
	Short to positive	This fault message is stored if the voltage of the signal from the accelerator position sender is greater than 4.7 V
		t  Open circuit or short to positive in wiring t  -G79- defective	t  Increased idling speed t  No throttle response	–  Check accelerator position sender → Chapter
	Voltage supply	This fault message is stored if the voltage supply to the accelerator position sender is less than 4.76 V or greater than 5.2 V
		t  Open circuit or short circuit in wiring t  -G79- defective	t  Increased idling speed t  No throttle response	–  Check accelerator position sender → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01028
Blower relay -J323-
	Open circuit/short to earth	This fault message is stored if the engine control unit is not activating the blower relay and there is no voltage at the control unit input
		t  Open circuit in wiring t  Relay defective	t  No radiator fan run-on	–  Rectify open circuit or short circuit → Current flow diagrams, Electrical fault finding and Fitting locations
		t  Short to earth	t  Radiator fan runs continuously
	Output does not sw./short to pos.	This fault message is stored if the engine control unit is activating the blower relay and too much current is flowing at the control unit input
		t  Short to positive	t  No radiator fan run-on	–  Rectify open circuit or short circuit → Current flow diagrams, Electrical fault finding and Fitting locations

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01044 Control unit incorrectly coded
		This fault message is stored if the engine control unit has an invalid coding
		t  Invalid control unit coding	t  Glow period warning lamp flashes	–  Code engine control unit → Chapter
01117 Load signal for alternator terminal DF
	Implausible signal	This fault message is stored if the load on the alternator remains at 0% for 10 minutes.
		t  Open circuit in wiring	t  Supplementary heater does not work	–  Rectify open circuit or short circuit → Current flow diagrams, Electrical fault finding and Fitting locations

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01126
Engine speed signal
	Signal outside tolerance	This fault message is stored if the impulses from the engine speed sender are not received by the injection pump within a specified period.
		t  Start of delivery from injection pump incorrect t  Open circuit in wiring	t  Engine will not start t  Engine cuts out	–  Check commencement of injection → Chapter –  Check engine speed signal → Chapter
	No signal	This fault message is stored if the injection pump is not receiving any impulses from the engine speed sender.
		t  Open circuit in wiring t  Injection pump defective	t  Engine will not start t  Engine cuts out	–  Check engine speed signal → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01180
Engine / AC compressor cut-off: electrical connection
	Short to positive	This fault message is stored if there is too much current along the wiring from the air conditioner operating and display unit.
		t  Short circuit in wiring	t  Slower acceleration when air conditioner is on	–  Check AC compressor signal and AC compressor shut-off → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01259
Fuel pump relay -J17-
	Open circuit/short to earth	t  Short circuit in wiring t  Short to earth	t  Misfiring t  Engine cuts out	–  Rectify open circuit or short circuit
	Output does not sw./short to pos.	t  Short to positive		→ Current flow diagrams, Electrical fault finding and Fitting locations

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01262 Charge pressure control solenoid valve -N75-
	Open circuit/short to earth	This fault message is stored if the engine control unit fails to activate the solenoid valve for boost pressure (charge pressure) control and there is no voltage at the control unit input.
		t  Open circuit in wiring t  Solenoid valve defective	t  Reduced power t  Charge pressure too low	–  Basic setting, block 11, refer to → Chapter –  Check solenoid valve for charge pressure control
		t  Short to earth	t  Reduced power t  Charge pressure too high	→ Rep. Gr.21

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01262 Charge pressure control solenoid valve -N75-
	Output does not sw./short to pos.	This fault message is stored if the engine control unit is activating the charge pressure control solenoid valve and too much current is flowing at the control unit input.
		t  Short to positive	t  Reduced power t  Charge pressure too low	–  Basic setting, block 11, refer to → Chapter –  Check solenoid valve for charge pressure control → Rep. Gr.21

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01265
Exhaust gas recirculation valve -N18-
	Open circuit/short to earth	This fault message is stored if the engine control unit does not activate the exhaust gas recirculation valve and there is no voltage at the control unit input
		t  Open circuit in wiring t  Solenoid valve defective	t  No exhaust gas recirculation	–  Basic setting, block 3, refer to → Chapter –  Check exhaust gas recirculation valve
		t  Short to earth	t  Too much exhaust gas recirculation t  Reduced power, black exhaust smoke	→ Rep. Gr.26

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01265
Exhaust gas recirculation valve -N18-
	Output does not sw./ short to pos.	This fault message is stored if the engine control unit is activating the exhaust gas recirculation valve and too much current is flowing at the control unit input.
		t  Short to positive	t  No exhaust gas recirculation	–  Basic setting, block 3, refer to → Chapter –  Check exhaust gas recirculation valve → Rep. Gr.26

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01266
Glow plug relay -J52
	Open circuit/short to earth	This fault message is stored if the engine control unit fails to activate the glow plug relay and there is no voltage at the control unit input.
		t  Open circuit in wiring t  Relay defective	t  Glow plug system not working	–  Rectify open circuit or short circuit → Current flow diagrams, Electrical fault finding and Fitting locations
		t  Short to earth	t  Glow plug system remains on constantly
	Output does not sw./ short to pos.	This fault message is stored if the engine control unit is activating the glow plug relay and too much current is flowing at the control unit input.
		t  Short to positive	t  Glow plug system not working	–  Rectify open circuit or short circuit → Current flow diagrams, Electrical fault finding and Fitting locations

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01268
Metering adjuster -N146-
	Defective	This fault message is stored if the metering solenoid valve or the activation (in the injection pump) is defective
		t  Metering adjuster defective t  Voltage supply to injection pump too low t  Fault entry relating to the CAN bus t  Sporadic short circuit in wiring harness	t  Reduced power output (engine protection) t  Engine stops (safety cut-out)	–  Test sequence if engine does start: –  Read measured value block 18, check that voltage in display zone 1 is at least 11 Volt and the value of all bits in display zone 3 must be 0. If both readings are as specified, erase fault memory and perform road test, then interrogate fault memory again. –  Test sequence continued in table on next page

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01268
Metering adjuster -N146-
				–  Check data wiring between engine control unit and injection pump → Chapter –  If 00000010 is indicated in display zone 3, renew injection pump → Chapter –  Test sequence if engine does not start: –  Select measured value block 18 (with ignition switched on) and check voltage supply in display zone 1: specification at least 11 Volt. –  Test sequence continued in table on next page

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01268
Metering adjuster -N146-
				–  First interrogate all control units capable of CAN communication and eliminate all faults indicated –  Detach connector from injection pump and check pins for corrosion and correct seating. Re-attach connector and erase fault memory, then interrogate fault memory again. –  If the fault is entered again, renew injection pump → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01282 Variable intake manifold flap change-over valve -N239-
	Output does not sw./ short to pos.	This fault message is stored if the engine control unit is activating the changeover valve for the intake manifold flap and too much current is flowing at the control unit input.
		t  Short to positive	t  Engine starts but cuts out again immediately	–  Check intake manifold flap changeover valve → Chapter
	Open circuit/short to earth	This fault message is stored if the engine control unit fails to activate the changeover valve for the intake manifold flap and there is no voltage at the control unit input.
		t  Open circuit in wiring t  Short to earth		–  Check intake manifold flap changeover valve → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01318
Injection pump control unit -J399-
	Defective	This fault message is stored if the injection pump has detected a fault during the self-test. (The injection pump control unit is part of the injection pump.)
		t  Injection pump defective	t  Reduced power output (engine protection) t  Engine stops (safety cut-out)	–  Renew injection pump → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01318
Injection pump control unit -J399-
	No communication	This fault message is stored if signal transmission along the data wiring between the engine control unit and the injection pump is interrupted.
		t  Open circuit in data wire to injection pump	t  Engine will not start t  Engine cuts out	–  Erase fault memory after performing compression test. –  First interrogate all control units capable of CAN communication and eliminate all faults indicated –  Read measured value block 18, check that voltage in display zone 1 is at least 10.5 Volt, charge battery if necessary, then erase fault memory and interrogate fault memory again. –  Test sequence continued in table on next page

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
				–  Detach connector from injection pump and check pins for corrosion and correct seating. Re-attach connector and erase fault memory, then interrogate fault memory again. –  Check CAN matching resistor in injection pump → Chapter –  Check data wiring between engine control unit and injection pump → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01375
Engine mounting valves stage 1
	Open circuit/short to earth	This fault message is stored if the engine control unit fails to activate the engine mounting valves and there is no voltage at the control unit input.
		t  Open circuit in wiring t  Engine mounting -N144- or -N145 defective	t  Electro-hydraulic engine mountings permanently hard	–  Rectify open circuit or short circuit
		t  Short to earth	t  Electro-hydraulic engine mountings permanently soft	→ Rep. Gr.10
	Output does not sw./ short to pos.	This fault message is stored if the engine control unit is activating the engine mounting valves and too much current is flowing at the control unit input.
		t  Short to positive	t  Electro-hydraulic engine mountings permanently hard	–  Rectify open circuit or short circuit → Current flow diagrams, Electrical fault finding and Fitting locations

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01376
Rev signal for injection pump
	No signal	This fault message is stored if impulses are being transmitted by the engine speed sender but not by the the sender in the injection pump.
		t  Injection pump not turning t  Toothed belt for injection pump broken	t  Engine cuts out	–  Check toothed belt and toothed belt sprocket
	Defective	This fault message is stored if the speed sender in the injection pump is transmitting false signals or no signal at all.
		t  Injection pump defective	t  Engine stops (safety cut-out)	–  Renew injection pump → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01440
Fuel level signal
	Open circuit/short to positive	This fault message is stored if there is a short to battery positive in the wiring to the dash panel insert.
		t  Open circuit or short to positive in wiring	t  Glow period warning lamp flashes	–  Check fuel level signal → Chapter
	Short to earth	This fault message is stored if there is an open circuit or short to battery negative in the wiring to the dash panel insert.
		t  Short to earth in wiring	t  Glow period warning lamp flashes	–  Check fuel level signal → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01441
Low fuel level sender -G210-
	Open circuit/short to positive	This fault message is stored if the voltage of the signal from the sender for low fuel level is greater than 2.65 V.
		t  Open circuit or short to positive in wiring t  -G210- defective	t  Glow period warning lamp flashes	–  Check fuel level signal → Chapter –  Check sender for low fuel level -G210- → Rep. Gr.20.
	Short to earth	This fault message is stored if the voltage of the signal from the sender for low fuel level is less than 0.5 V.
		t  Short to earth in wiring t  -G210- defective	t  Glow period warning lamp flashes	–  Check fuel level signal → Chapter –  Check sender for low fuel level -G210- → Rep. Gr.20.

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01441
Low fuel level sender -G210-
	Implausible signal	This fault message is stored if the sender for low fuel level indicates “no fuel” but the fuel level signal in the dash panel insert does not indicate that the tank needs filling.
		t  Fuel pump not supplying fuel, baffle housing empty t  -G210- defective	t  Glow period warning lamp flashes t  Engine cuts out due to air in fuel system	–  Check fuel pump –  Check that baffle housing is filled → Rep. Gr.20 –  Eliminate air in fuel system → Chapter
		t  -G210- defective t  Fault in fuel level signal		–  Check fuel level signal → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01442
Misfiring due to lack of fuel		This fault message is stored if the fuel tank is empty.
		t  Vehicle has been driven until tank is empty	t  Fault “01441 Implausible signal” certainly not stored t  Misfiring t  Engine cuts out because vehicle has been driven until tank is empty	–  Put fuel in fuel tank
		t  Baffle housing is not filled with fuel even though there is sufficient fuel in tank	t  Fault “01441 Implausible signal” stored t  Engine cuts out due to air in fuel system	–  Check fuel pump –  Check that baffle housing is filled → Rep. Gr.20 –  Eliminate air in fuel system → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01613
Fuel cooling pump relay
	Output does not sw./short to pos.	This fault message is stored if the engine control unit is activating the fuel cooling pump relay and too much current is flowing at the control unit input.
		t  Short to positive	t  Loss of power	–  Check wiring → Current flow diagrams, Electrical fault finding and Fitting locations
	Open circuit/short to earth	This fault message is stored if the engine control unit fails to activate the fuel cooling pump relay and there is no voltage at the control unit input.
		t  Open circuit in wiring	t  Loss of power	–  Check wiring
		t  Short to earth t  Fuel cooling pump relay defective		→ Current flow diagrams, Electrical fault finding and Fitting locations

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
01695
Fuel temperature sender 2 -G248-
	Short to earth	This fault message is stored if the voltage of the signal from the sender 2 for fuel temperature is less than 4.1 V.
		t  Short to earth	t  No noticeable effects	–  Check wiring
		t  Fuel temperature sender 2 defective		→ Current flow diagrams, Electrical fault finding and Fitting locations
	Open circuit/short to positive	This fault message is stored if the voltage of the signal from the sender 2 for fuel temperature is greater than 4.7 V.
		t  Open circuit in wiring	t  No noticeable effects	–  Check wiring
		t  Short to positive		→ Current flow diagrams, Electrical fault finding and Fitting locations

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
17978
Engine control unit Blocked		This fault message is stored if the ignition was switched on but the engine control unit did not receive a starting signal from the immobilizer.
		t  Attempted tampering t  Immobilizer not adapted t  Immobilizer defective	t  Engine starts but cuts out again immediately	–  Adapt electronic immobilizer to engine control unit –  Adapt electronic immobilizer to injection pump using vehicle diagnosis and service information system -VAS 5052-.

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
18034
Drive train data bus
	No message from gearbox CU	This fault message is stored if signal transmission along the data wire (CAN bus) between the engine control unit and the gearbox control unit is malfunctioning.
		t  Data wire to gearbox control unit defective	t  Gearbox in emergency running mode	–  Check data wire (CAN bus) between engine control unit and gearbox control unit → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
18259
Drive train data bus
	No message from ABS CU	This fault message is stored if signal transmission along the data wire (CAN bus) between the engine control unit and the ABS control unit is malfunctioning.
		t  Wrong engine control unit and/or ABS control unit fitted	t  ASR warning lamp lights up t  Traction control system does not work	–  Check Part Nos.
		t  Fault in data wire to ABS control unit		–  Check data wire between engine control unit and ABS control unit → Chapter
65535
Control unit defective		t  Internal fault in control unit	t  Engine running problems t  Engine cuts out	–  Renew engine control unit → Chapter