Audi Workshop Service and Repair Manuals

Fault table for faults with fault code up to “01336”

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
00000 No fault detected			Self-diagnosis is over if “No fault detected” appears on completion of repair work and after checking auxiliary heater operation. –  If no fault is found despite problems with the auxiliary heater, check encoding ( → Chapter) and adaption ( → Chapter) of auxiliary heater control unit -J364- and then implement functions “Final control diagnosis 03” ( → Chapter) and “Reading measured value block 08” ( → Chapter).

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
00466
Steering column electronics control unit -J527-
	t  Read out fault memory		t  The steering column electronics control unit -J527- cannot output the required data on account of a fault and sets a fault message. t  The steering column electronics control unit -J527- cannot output the required data on account of a fault in an upstream component and sets a fault message.	–  Interrogate fault memory of steering column electronics control unit -J527-. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. –  Determine and eliminate the causes of all faults stored in the fault memory of the steering column electronics control unit -J527-.
	t  No communication / SP		t  Interruption of power supply to steering column electronics control unit -J527- with ignition switched on	–  Eliminate cause of trouble and interrogate/erase fault memories of all control units connected to convenience data bus. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
Continued in next table

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
00466 (continued)
	t  No communication / SP		t  Fault affecting data output in steering column electronics control unit -J527- or in a component connected to it	–  Interrogate fault memory of steering column electronics control unit -J527-. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
			t  No data telegram transmitted by steering column electronics control unit -J527- t  The auxiliary heater control unit -J364- cannot read the data telegram transmitted by the steering column electronics control unit -J527-.	–  Check convenience data bus system → Chapter.
			t  Open circuit in both signal wires (convenience data bus system) between steering column electronics control unit -J527- and auxiliary heater control unit -J364-	–  Use current flow diagram to locate and eliminate open circuit or loose contact at both signal wires (convenience data bus) between steering column electronics control unit -J527- and auxiliary heater control unit -J364-. –  Check convenience data bus system → Chapter.

Note t  The fault steering column electronics control unit -J527- does not result in deactivation of the auxiliary heater. t  Reception of the information is displayed in the measured value block of the auxiliary heater control unit -J364- (display group 125) → Chapter.

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
00474
Immobilizer control unit -J334-
	t  No communication (time out) / SP		t  Immobilizer adaption not performed as specified and in full t  Starting implemented using a key not released for this vehicle (e.g. by way of emergency starting function)	–  Interrogate fault memory of control unit in dash panel insert -J285-. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. –  Switch on ignition with a released ignition key, adapt ignition key used and interrogate and erase fault memory of auxiliary heater control unit -J364- → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
			t  Fault affecting data output in control unit in dash panel insert -J285- or in a component connected to it	–  Interrogate fault memory of control unit in dash panel insert -J285-. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
			t  No data telegram transmitted by control unit in dash panel insert -J285- t  The auxiliary heater control unit -J364- cannot read the data telegram transmitted by the control unit in dash panel insert -J285-.	–  Check convenience data bus system → Chapter.

Note t  The fault immobilizer control unit -J334- does not result in deactivation of the auxiliary heater. t  The immobilizer control unit -J334- is installed in the control unit in dash panel insert -J285-. t  Reception of the information is displayed in the measured value block of the auxiliary heater control unit -J364- (display group “125”) → Chapter.

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
00532
Supply voltage
	t  Signal too low / SP		t  Voltage dips in auxiliary heating/auxiliary ventilation mode to below undervoltage shutoff value stored in auxiliary heater control unit -J364-	–  Check, re-charge or replace battery -A-. → Current flow diagrams, Electrical fault-finding and Fitting locations –  Check shutoff voltage value entered in “Adaption” function → Chapter –  Use current flow diagram to check for contact resistance in positive and earth connection to auxiliary heater control unit -J364-. → Current flow diagrams, Electrical fault-finding and Fitting locations
			t  Voltage dips in vehicle electrical system to values below 9.5 V	–  Check alternator -C- and voltage regulator: → Current flow diagrams, Electrical fault-finding and Fitting locations
Continued in next table

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
00532 (continued)
Supply voltage
	t  Signal too high / SP		t  Voltage in vehicle electrical system has exceeded 15 V	–  Check alternator -C- and voltage regulator: → Current flow diagrams, Electrical fault-finding and Fitting locations
	t  Open circuit / short to positive / SP		t  Open circuit or short circuit in wiring between auxiliary heater control unit -J364- and battery -A-	–  Use current flow diagram to check for open circuit or contact resistance in positive and earth connections between auxiliary heater control unit -J364- and battery -A- (by way of auxiliary heater fuse -S62-). → Current flow diagrams, Electrical fault-finding and Fitting locations

Note t  The fault “Signal too high” may also be displayed for example if an unsuitable charging unit is used for charging the battery. t  The two wiring connections between the auxiliary heater control unit -J364- and the vehicle (contacts “9” and “4” in the vehicle connector) are used for measuring the battery voltage for the “undervoltage shutoff” function. The fault “Open circuit” is entered if a fault is found at this wiring connection. t  The fault “Supply voltage” results in deactivation of the auxiliary heater. The auxiliary heater cannot be re-started until the engine has been started at least once and the fault is no longer present (signal “Terminal 15 on” must be received at least once via convenience data bus system).

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
00664
Fuel gauge
	t  Signal too low / SP		t  The control unit in dash panel insert -J285- transmits the message “Not enough fuel in tank” by way of the convenience data bus system.	–  Check quantity of fuel in tank and re-fuel if necessary. –  Check fuel gauge sender and control unit in dash panel insert -J285-. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.

Note t  The fault “Fuel supply” results in deactivation of the auxiliary heater. The auxiliary heater cannot be re-started until the engine has been started at least once and the fault is no longer present (signal “Terminal 15 on” must be received at least once via convenience data bus system). t  To prevent the fuel tank running completely empty in auxiliary heating mode, the control unit in dash panel insert -J285- transmits the message “Signal too low” as soon as the “Tank warning” symbol is activated or the fuel gauge enters the “red zone”. The auxiliary heater control unit -J364- then does not switch on the auxiliary heater (or auxiliary ventilation). This avoids situations where the engine cannot be started on account of insufficient fuel.

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01044
Control unit incorrectly coded / SP
			t  The type of fuel (petrol or diesel) stored in the auxiliary heater control unit -J364- does not coincide with that transmitted by the control unit in dash panel insert -J285- via the convenience data bus system	t  Check adaption of auxiliary heater control unit -J364- and implement as specified if necessary → Chapter –  Check encoding and adaption of control unit in dash panel insert -J285- and correct if necessary. → Electrical system; Rep. Gr. 01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.

Note t  The auxiliary heater does not start in the event of the fault “Control unit incorrectly coded”. The auxiliary heater cannot be re-started until the engine has been started at least once and the fault is no longer present (signal “Terminal 15 on” must be received at least once via convenience data bus system). t  If the assignment of the auxiliary heater control unit -J364- (rating plate) differs from the fault reader display, check the adaption (adaption channel “05”). If the type of fuel has been altered in this channel, the setting in the auxiliary heater control unit -J364- changes the first time the ignition is switched on (the type of fuel transmitted by way of the convenience data bus system must coincide with that entered in the “Adaption” function).

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01233
Heater coolant shut-off valve -N279-
	t  Open circuit / short to positive / SP t  Short to earth / SP		t  Open circuit or short circuit in wiring between auxiliary heater control unit -J364- and heater coolant shut-off valve -N279- t  Heater coolant shut-off valve -N279- defective	–  Use current flow diagram to locate and eliminate open circuit or short circuit. → Current flow diagrams, Electrical fault-finding and Fitting locations –  Perform final control diagnosis → Chapter. –  Check auxiliary heater electrical components → Chapter.
			t  Auxiliary heater control unit -J364- not encoded in specified manner (for example, vehicles with 4-cyl. engine are not always fitted with a shut-off valve)	–  Check whether the vehicle is fitted with a shut-off valve. –  Auxiliary heater control unit -J364- not encoded in specified manner; check and if necessary correct encoding → Chapter.

Note t  The fault Heater coolant shut-off valve -N279- does not result in deactivation of the auxiliary heater. t  In the event of a fault at the heater coolant shut-off valve -N279-, the coolant circuit is not switched in auxiliary heating mode to the “small coolant circuit” and it takes longer to heat the passenger compartment.

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01317
Control unit in dash panel insert -J285-
	t  Read out fault memory		t  The control unit in dash panel insert -J285- cannot output the required data on account of a fault and sets a fault message. t  The control unit in dash panel insert -J285- cannot output the required data on account of a fault in an upstream component and sets a fault message.	–  Interrogate fault memory of control unit in dash panel insert -J285-. → Electrical system; Rep. Gr. 01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. –  Determine and eliminate the causes of all faults stored in the fault memory of the control unit in dash panel insert -J285-.
	t  No communication / SP		t  Open circuit in both signal wires (convenience data bus system) between control unit in dash panel insert -J285- and auxiliary heater control unit -J364-	–  Use current flow diagram to locate and eliminate open circuit or loose contact at both signal wires (convenience data bus system) between control unit in dash panel insert -J285- and auxiliary heater control unit -J364-. –  Check convenience data bus system → Chapter.
Continued in next table

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01317 (continued)
	t  No communication / SP		t  Control unit in dash panel insert -J285- incorrectly encoded (incorrect adaption for auxiliary heater in channel “18” and / or “61”)	–  Check encoding and adaption of control unit in dash panel insert -J285- and correct if necessary. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
			t  Fault affecting data output in control unit in dash panel insert -J285- or in a component connected to it	–  Interrogate fault memory of control unit in dash panel insert -J285-. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
			t  No data telegram transmitted by control unit in dash panel insert -J285- t  The auxiliary heater control unit -J364- cannot read the data telegram transmitted by the control unit in dash panel insert -J285-.	–  Check convenience data bus system → Chapter.
			t  Interruption of power supply to control unit in dash panel insert -J285- with ignition switched on	–  Interrogate and erase fault memories of all control units connected to the various data bus systems. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.

Note t  The fault Control unit in dash panel insert -J285- does not result in deactivation of the auxiliary heater. t  Reception of the information is displayed in the measured value block of the auxiliary heater control unit -J364 - (display group “125”) → Chapter.

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01320
Climatronic control unit -J255- –  Air conditioner operating and display unit
	t  Read out fault memory		t  The operating and display unit, Climatronic control unit -J255- cannot output the required data on account of a fault and sets a fault message. t  The operating and display unit, Climatronic control unit -J255- cannot output the required data on account of a fault in an upstream component and sets a fault message.	–  Interrogate fault memory of operating and display unit, Climatronic control unit -J255-. → Air conditioning; Rep. Gr.01 or → Heating; Rep. Gr.01 –  Determine and eliminate the causes of all faults stored in the fault memory of the operating and display unit, Climatronic control unit -J255-.
Continued in next table

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01320 (continued)
	t  No communication / SP		t  Open circuit in both signal wires (convenience data bus system) between operating and display unit, Climatronic control unit -J255- and auxiliary heater control unit -J364-	–  Use current flow diagram to locate and eliminate open circuit or loose contact at both signal wires (convenience data bus system) between operating and display unit, Climatronic control unit -J255- and auxiliary heater control unit -J364-. –  Check convenience data bus system → Chapter.
			t  Control unit in dash panel insert -J285- incorrectly encoded (incorrect adaption for auxiliary heater in channel 18 and / or 61)	–  Check encoding and adaption of control unit in dash panel insert -J285- and correct if necessary. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
			t  Fault affecting data output in control unit in dash panel insert -J285- or in a component connected to it	–  Interrogate fault memory of control unit in dash panel insert -J285-. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
Continued in next table

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01320 (continued)
	t  No terminal 30 / SP		t  The operating and display unit, Climatronic control unit -J255- cannot output the required data on account of a fault in the power supply and sets a fault message.	–  Use current flow diagram to check and repair power supply and earth connection to operating and display unit, Climatronic control unit -J255-. –  Interrogate fault memory of operating and display unit, Climatronic control unit -J255-. → Air conditioning; Rep. Gr.01 → Heating; Rep. Gr.01

Note t  The fault Climatronic control unit -J255- does not result in deactivation of the auxiliary heater. t  Reception of the information is displayed in the measured value block (display group 125) → Chapter. t  The fault location output in the fault memory for the operating and display unit, Climatronic control unit -J255- of the air conditioner / heater is the Climatronic control unit -J255- (stored as such in auxiliary heater control unit -J364-).

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01330
Convenience system central control unit -J393-
	t  Read out fault memory		t  The convenience system central control unit -J393- cannot output the required data on account of a fault and sets a fault message. t  The convenience system central control unit -J393- cannot output the required data on account of a fault in an upstream component and sets a fault message.	–  Interrogate fault memory of convenience system central control unit -J393-. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. –  Determine and eliminate the causes of all faults stored in the fault memory of the convenience system central control unit -J393-.
	t  No communication (time out) / SP		t  Open circuit in both signal wires (convenience data bus system) between convenience system central control unit -J393- and auxiliary heater control unit -J364-	–  Use current flow diagram to locate and eliminate open circuit or loose contact at both signal wires (convenience data bus system) between convenience system central control unit -J393- and auxiliary heater control unit -J364-. –  Check convenience data bus system → Chapter.
Continued in next table

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01330 (continued)
	t  No communication (time out) / SP		t  Fault affecting data output in convenience system central control unit -J393- or in a component connected to it	–  Interrogate fault memory of convenience system central control unit -J393-. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
			t  No data telegram transmitted by convenience system central control unit -J393- t  The auxiliary heater control unit -J364- cannot read the data telegram transmitted by the convenience system central control unit -J393-.	–  Check convenience data bus system → Chapter.
			t  Interruption of power supply to convenience system central control unit -J393- with ignition switched on	–  Interrogate and erase fault memories of all control units connected to the data bus system. → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.

Note t  The fault Convenience system central control unit -J393- does not result in deactivation of the auxiliary heater. t  Reception of the information is displayed in the measured value block of the auxiliary heater control unit -J364- (display group 125) → Chapter.

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01336
Group convenience data bus
	t  Internal power supply / SP t  Fault (Bus Off ) / SP		t  Open circuit or short to earth/positive in bus system signal wire t  Short circuit between bus system signal wires	–  Use current flow diagram to locate and eliminate short circuit (to earth, positive or between signal wires) or open circuit in data bus system wiring
			t  Data bus system signal wires interchanged	–  Use current flow diagram to check signal wires of data bus system (convenience data bus system).
			t  Destruction by one of the control units connected to the data bus system of data telegram transmitted.	–  Check convenience data bus system → Chapter.
Continued in next table

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01336 (continued)
	t  Internal power supply / SP t  Fault (Bus Off ) / SP		t  Control unit not designed for data bus connected to data bus system t  Open circuit or short to earth/positive in data bus system signal wire	–  Check part number of all control units connected to data bus system. → Parts List –  Use current flow diagram to locate and eliminate short circuit (to earth, positive or between signal wires) or open circuit in data bus system wiring (convenience data bus system)
			t  Open circuit in wiring, e.g. at junction of data bus system signal wires t  Open circuit in power supply to one or more control unit(s) connected to data bus system	–  Use current flow diagram to locate and eliminate open circuit in wiring in data bus system –  Use current flow diagram to locate and eliminate open circuit in power supply to one or more control unit(s) connected to data bus system. → Current flow diagrams, Electrical fault-finding and Fitting locations, → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
Continued in next table

Indicated on vehicle diagnostic, testing and information system -VAS 5051A- and output on printer			Possible cause of trouble	Fault rectification
01336 (continued)
	t  In one-wire operation / SP		t  Open circuit or short to earth/positive in data bus system signal wire	–  Use current flow diagram to locate and eliminate short circuit (to earth, positive or between signal wires) or open circuit in data bus system wiring (convenience data bus system)
			t  Destruction by one of the control units connected to the data bus system of data telegram transmitted on one of the two signal wires	–  Check convenience data bus system → Chapter.
	t  No messages (time out for several control units) / SP		t  Open circuit in wiring, e.g. at junction of data bus system signal wires t  Open circuit in power supply to one or more control unit(s) connected to data bus system	–  Use current flow diagram to locate and eliminate open circuit in wiring in bus system –  Use current flow diagram to locate and eliminate open circuit in power supply to one or more control unit(s) connected to data bus system. → Current flow diagrams, Electrical fault-finding and Fitting locations, → Electrical system; Rep. Gr.01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.

Note t  The fault “Group convenience data bus” does not result in deactivation of the auxiliary heater. However, in view of the fact that it may not be possible to receive data, auxiliary heating/auxiliary ventilation cannot always be activated. t  Reception of the information is displayed in the measured value block of the auxiliary heater control unit -J364- (display group 125) → Chapter.