Audi Workshop Service and Repair Manuals

Fault table: fault codes 00513...00628   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
00513
Engine speed sender -G28-
	Implausible signal	This fault message is stored if the sequence of pulses from the engine speed sender changes more rapidly than would be possible as a result of a change in engine speed.
		t  Sender rotor on flywheel or sender pins on torque converter plate are damaged	t  Glow period warning lamp flashes t  Loss of power (torque reduction)	–  Check sender rotor
		t  -G28- defective		–  Check engine speed sender → Chapter
	No signal	This fault message is stored if the engine speed sender and the injector pump speed sender have registered different speeds.
		t  -G28- defective t  Open circuit or short circuit in wiring	t  Glow period warning lamp flashes t  Loss of power (torque reduction)	–  Check engine speed sender → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00519
Intake manifold pressure sender -G71-
	Short to positive	This fault message is stored if the voltage of the signal from the intake manifold pressure sender is greater than 4.8 V.
		t  Open circuit or short to positive in wiring t  -G71- defective	t  Loss of power	–  Check intake manifold pressure sender → Rep. Gr.21
	Open circuit/short to earth	This fault message is stored if the voltage of the signal from the intake manifold pressure sender is less than 0.8 V.
		t  Open circuit or short to earth in wiring t  -G71- defective	t  Loss of power	–  Check intake manifold pressure sender → Rep. Gr.21

Table continued on next page

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00519
Intake manifold pressure sender -G71-
	Voltage supply	This fault message is stored if the voltage supply to the intake manifold pressure sender is less than 4.76 V or greater than 5.2 V.
		t  Open circuit or short circuit t  Intake manifold pressure sender -G71 defective	t  Loss of power	–  Check intake manifold pressure sender → Rep. Gr.21
	Implausible signal	This fault message is stored if the difference between the ambient air pressure and the charge pressure is greater than 400 mbar for about 3 seconds at engine speeds lower than 1000 rpm.
		t  Ice on intake manifold pressure sender -G71- t  Intake manifold pressure sender -G71 defective	t  Loss of power	–  Check intake manifold pressure sender → Rep. Gr.21

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00522
Coolant temperature sender -G62-
	Short to earth	This fault message is stored if the voltage of the signal from the coolant temperature sender is less than 0.4 V.
		t  -G62- defective t  Short to earth in wiring	t  Black exhaust smoke when starting t  Glow plugs always operate for about 20 seconds	–  Check coolant temperature sender → Chapter
	Open circuit/short to positive	This fault message is stored if the voltage of the signal from the coolant temperature sender is greater than 4.7 V.
		t  -G62- defective t  Open circuit or short to positive in wiring	t  Black exhaust smoke when starting t  Glow plugs always operate for about 20 seconds	–  Check coolant temperature sender → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00523
Intake air temperature sender -G42-
	Short to earth	This fault message is stored if the voltage of the signal from the intake air temperature sender is less than 0.4 V.
		t  -G42- defective t  Short to earth in wiring	t  Fixed substitute value	–  Check intake air temperature sender → Chapter
	Open circuit/short to positive	This fault message is stored if the voltage of the signal from the intake air temperature sender is greater than 4.7 V.
		t  -G42- defective t  Open circuit or short to positive in wiring	t  Fixed substitute value	–  Check intake air temperature sender → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00532
Voltage supply
	Signal too low	This fault message is stored if the voltage supply at the engine control unit is less than 9 V for a period of 60 seconds.
		t  Battery discharged t  Faulty wiring connection to engine control unit	t  Engine will not start t  Engine running problems, possibly including engine cut-out	–  Check voltage supply for diesel direct injection system → Chapter
	No fault type identified	This fault message is stored if the engine control unit has an internal defect.
		t  Engine control unit defective	t  Engine will not start	–  Renew engine control unit → Chapter
	Implausible signal	This fault message is stored if the engine control unit does not receive a constant voltage supply when the ignition is switched on.
		t  Intermittent open circuit (loose contact)	t  Engine will not start	–  Check voltage supply for diesel direct injection system → Chapter

Table continued on next page

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00532
Voltage supply
	Short to positive	This fault message is stored if the engine control unit has completed its self-test (sustained voltage phase) but the voltage supply has not been disconnected. (When the ignition is switched off the engine control unit continues to receive voltage for between 4 and 10 minutes. This is the self-test phase.)
		t  Diesel direct injection system relay defective (contacts sticking) t  Short to positive in wiring	t  Battery discharges	–  Check voltage supply for diesel direct injection system → Chapter
	Input open	This fault message is stored if the voltage supply to the engine control unit is cut during the self-test phase. (At the end of the self-test phase, i.e. after 4...10 minutes, the engine control unit shuts off the diesel direct injection system relay and thus cuts its own voltage supply)
		t  Battery was disconnected within 10 minutes of switching off ignition	t  Glow period warning lamp flashes	–  Erase fault memory
		t  Diesel direct injection system relay incorrectly connected		–  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
00534
Oil temperature sender -G8-
	Short to earth	This fault message is stored if the voltage of the signal from the oil temperature sender is less than 0.45 V.
		t  -G8- defective t  Short to earth in wiring	t  Fixed substitute value t  Reduced power output (engine protection)	–  Check oil temperature sender → Chapter
	Implausible signal	This fault message is stored if the coolant temperature is greater than 70 °C but the oil temperature is less than 20 °C.
		t  -G8- defective t  Open circuit or short to positive in wiring	t  Fixed substitute value t  Reduced power output (engine protection)	–  Check oil temperature sender → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00539
Fuel temperature sender -G81-
	Signal outside tolerance	This fault message is stored if the temperature of the fuel in the injection pump is greater than 100 °C.
		t  Full throttle at extremely high outside temperature	t  Reduced power output (engine protection)	–  Allow vehicle to cool down
		t  Blocked fuel filter or pipes		–  Check fuel system
	Defective	This fault message is stored if the fuel temperature sender is supplying a false signal or no signal at all.
		t  -G81- defective		–  Renew injection pump → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00542
Needle lift sender -G80
	Short to earth	This fault message is stored if the voltage of the signal from the needle lift sender is less than 0.1 V.
		t  -G80- defective t  Open circuit or short circuit	t  Glow period warning lamp flashes	–  Check needle lift sender → Chapter
	Open circuit/short to positive	This fault message is stored if the voltage of the signal from the needle lift sender is greater than 0.6 V.
		t  -G80- defective t  Open circuit or short circuit	t  Glow period warning lamp flashes	–  Check needle lift sender → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00546
Data wiring defective
	(Display blank)	This fault message is stored if there is a malfunction in the CAN bus between the engine control unit and the injection pump.
		t  Data wire to injection pump defective t  Short in CAN bus	t  Engine will not start t  Engine running problems, possibly including engine cut-out	–  First interrogate all control units capable of CAN communication and eliminate all faults indicated –  Read measured value block 18: voltage supply to injection pump in display zone 1 should be at least 10.5 Volt and the value of all bits in display zone 3 should be 0. –  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 start engine and interrogate fault memory again. –  Check CAN matching resistor in injection pump → Chapter –  Test sequence continued in table on next page

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
		t  Data wire to injection pump defective t  Short in CAN bus	t  Engine will not start t  Engine running problems, possibly including engine cut-out	–  Check data wiring between engine control unit and injection pump → Chapter
	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  CAN bus overloaded		Trace open circuit in CAN bus between the various control units

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00550
Injection commencement regulation
	Control difference	This fault message is stored if the actual crankshaft angle at the start of delivery differs from the specified angle by more than 3°. The specification is transmitted by the engine control unit to the injection pump. The comparison between specification and actual value is carried out in the injection pump.
		t  Tank filled with petrol or biodiesel t  Water in fuel t  Air in fuel system t  Start of delivery not OK.	t  Loss of power at high engine speeds t  Engine will not start easily t  Gearbox in emergency running mode t  Fault 00575 is stored	–  Check tank for petrol or biodiesel; if this is the case: drain tank and fill with diesel, erase fault memory and perform road test, then interrogate fault memory again –  Check fuel filter for blockage –  Check fuel supply and return lines for blockage or kinks

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
				–  Drain fuel filter → Chapter –  Check fuel system for leaks → Chapter –  Eliminate air in fuel system → Chapter –  Check electrical fuel pump → Rep. Gr.20 –  Check injection timing control range → Chapter –  Erase fault memory and perform road test, then interrogate fault memory again

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00550
Injection commencement regulation
	Regulating limit not reached Regulating limit exceeded	This fault message is stored if the actual crankshaft angle at commencement of injection differs from the specified angle by more than 3°. The actual commencement of injection is transmitted by the needle lift sender to the engine control unit. The comparison between specification and actual value is carried out in the engine control unit.
		t  Start of delivery not OK.	t  Loss of power at high engine speeds t  Engine will not start easily	–  Check and adjust commencement of injection → Chapter –  Check needle lift sender → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00550
Injection commencement regulation
	Implausible signal	This fault message is stored if the injection timing control in the injection pump “jumps”
		t  Tank filled with petrol or biodiesel t  Fuel filter blocked t  Fuel lines kinked or clogged t  Air in fuel system	t  Loss of power at high engine speeds t  Loud combustion noise t  Rattling noises in pump (injection timing control) t  Starting problems when engine is cold	–  Check tank for petrol or biodiesel; if this is the case: drain tank and fill with diesel, erase fault memory and perform road test, then interrogate fault memory again –  Check fuel filter for blockage –  Check fuel supply and return lines for blockage or kinks –  Test sequence continued in table on next page

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
				–  Drain fuel filter → Chapter –  Check fuel system for leaks → Chapter –  Eliminate air in fuel system → Chapter –  Check electrical fuel pump → Rep. Gr.20 –  Erase fault memory and perform road test, then interrogate fault memory again

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00553
Air mass meter -G70-
	Implausible signal	This fault message is stored if the intake air mass is less than 200 mg/stroke at engine speeds of more than 3100 rpm.
		t  Air cleaner blocked t  Vacuum hose system for exhaust gas recirculation incorrectly connected, or mechanical exhaust gas recirculation valve constantly open	t  Rough idling, loss of power	–  Check intake system –  Check vacuum hoses → Rep. Gr.26.
		t  Air mass meter defective	t  Loss of power, jolting	–  Check air mass meter → Chapter
	Open circuit/short to earth	This fault message is stored if the voltage of the signal from the air mass meter is less than 0.16 V.
		t  Open circuit or short to earth in wiring t  -G70- defective	t  Reduced power t  Black exhaust smoke possible when accelerating from low speeds	–  Check air mass meter → Chapter

Table continued on next page

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00553
Air mass meter -G70-
	Short to positive	This fault message is stored if the voltage of the signal from the air mass meter is greater than 4.8 V
		t  Open circuit or short to positive in wiring t  -G70- defective	t  Reduced power t  Black exhaust smoke possible when accelerating from low speeds	–  Check air mass meter → Chapter
	Voltage supply	This fault message is stored if the voltage supply from the air mass meter is less than 4.76 V or greater than 5.2 V.
		t  Open circuit or short circuit t  -G70- defective	t  Reduced power t  Black exhaust smoke possible when accelerating from low speeds	–  Check air mass meter → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00560
Exhaust gas recirculation, control difference
	Regulating limit not reached	This fault message is stored if the intake air mass is a certain amount less than specified air mass for approx. 10 seconds
		t  Exhaust gas recirculation valve -N18- defective t  Hoses wrongly connected, blocked or leaking t  Mechanical EGR valve defective	t  Reduced power t  Black exhaust smoke	–  Check exhaust gas recirculation system → Rep. Gr.26
	Regulating limit exceeded	This fault message is stored if the intake air mass exceeds the specified air mass by a certain amount for approx. 10 seconds
		t  Exhaust gas recirculation valve -N18- defective t  Hoses not connected, wrongly connected, blocked or leaking		–  Check exhaust gas recirculation system → Rep. Gr.26

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00575
Intake manifold pressure
	Regulating limit not reached	This fault message is stored if the measured charge pressure is 800 mbar lower than the specified value for about 4 seconds above a certain engine speed and injection quantity.
		t  Hoses not connected, wrongly connected, blocked or leaking t  Turbocharger defective	t  Charge pressure too low t  Reduced power	–  Basic setting, measured value block 11, refer to → Chapter –  Check charge pressure → Rep. Gr.21
	Regulating limit exceeded	This fault message is stored if the measured charge pressure is 200 mbar higher than the specified value for about 4 seconds above a certain engine speed and injection quantity.
		t  Charge pressure control solenoid valve -N75- defective t  Turbocharger defective (charge pressure control mechanism sticking)	t  Charge pressure too high t  Sudden loss of power t  Reduced power	–  Basic setting, measured value block 11, refer to → Chapter –  Check charge pressure → Rep. Gr.21

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00625
Speed signal
	Implausible signal	This fault message is stored if, for a period of about 10 seconds, the engine speed is greater than 2800 rpm, the injection quantity is greater than 20 mg/stroke and the measured road speed is less than 5 km/h.
		t  Open circuit between speedometer sender -G22 and dash panel insert t  -G22- defective t  Speedometer -G21- defective t  Open circuit between dash panel insert and engine control unit	t  Cruise control system not working t  Air conditioner not working t  Load change shocks	–  Check vehicle speed signal → Chapter –  Check speedometer sender → Rep. Gr.90
	Signal too high	This fault message is stored if the measured road speed is greater than 290 km/h.
		t  Signal interference t  -G22- defective	t  Cruise control system not working t  Air conditioner not working t  Load change shocks	–  Check vehicle speed signal → Chapter –  Check speedometer sender → Rep. Gr.90

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00626
Glow period warning lamp -K29-
	Open circuit/short to earth	This fault message is stored if the engine control unit fails to activate the glow period warning lamp and there is no voltage at the control unit input.
		t  Open circuit in wiring t  Bulb defective	t  Glow period warning lamp not working	–  Check glow period warning lamp → Chapter
		t  Short to earth	t  Glow period warning lamp permanently lit
	Output does not sw./short to pos.	This fault message is stored if the engine control unit is activating the glow period warning lamp and too much current is flowing at the control unit input
		t  Short to positive	t  Glow period warning lamp not working	–  Check glow period warning lamp → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00628
Control element setting monitoring
	Implausible signal	This fault message is stored if the engine control unit has sent a cut-out signal to the injection pump, the injection pump confirms receipt, but the engine keeps running
		t  Injection pump defective	t  Engine stops (safety cut-out)	–  Read measured value block 18, display zone 3; check cut-out signal if display indicates 00100000; erase fault memory, start engine and interrogate fault memory again if display indicates 00000000 –  Check cut-out signal → Chapter; if wiring is OK, renew injection pump → Chapter

Output on printer of -V.A.G 1551-		Possible cause of fault	Possible effects	Fault remedy
00628
Control element setting monitoring
	Open circuit/short to earth	This fault message is stored if the engine control unit has sent a cut-out signal to the injection pump but the injection pump has not received it
		t  Open circuit or short to earth in wiring	t  Engine cuts out (safety cut-out via data wire)	–  Check cut-out signal → Chapter
	Short to positive	This fault message is stored if the injection pump has received a cut-out signal but no cut-out signal has been sent by the engine control unit.
		t  Open circuit or short to positive in wiring	t  Engine cuts out	–  Check cut-out signal → Chapter