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Additional heater fault table
Additional heater fault table
Notes:
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◆ Listed below on the basis of fault codes are all the faults which can be detected by the -J162 additional heater control unit and displayed on VAS 5051.
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◆ The fault memory can store a maximum of 3 faults. If a further fault occurs the fault that occurred first is erased. The ambient conditions under which each fault occurred are stored and can be interrogated using the "Read measured value block 08, display group 005 to 007" function .
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◆ If faults only occur sporadically or if the fault memory is not erased after fault remedy, these faults are displayed as "sporadic faults" (display "/SP"). (The content of the fault memory is retained until it is erased, "non-volatile memory").
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◆ An indication of the type of fault may also appear in the fault table (a display marked * appears, as well as the component concerned or the "info" display).
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◆ Once repairs have been completed, the fault memory must always be interrogated again with fault reader VAS 5051 and erased.
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◆ Before replacing components, always use the current flow diagram to check the relevant positive and earth connections (terminals 30 and 31) and all connectors (between -J162 and the component indicated as being faulty).
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◆ With all sporadic faults, it is particularly important to check the connectors for possible loose contacts.
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◆ After replacing an additional heater component, always read out the fault memory, rectifying any faults that are indicated and erase them from the memory (functions 02 and 05).
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◆ If no fault is detected despite complaints about the additional heater, the functions "Final control diagnosis 03" and "Read measured block 08" should be performed.
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◆ If a fault occurs several times in a row (e.g. fault "loss of flame") the additional heater is locked after a fault has occurred 6 times and switching it on is only possible after erasing the fault memory.
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◆ Check additional heater function
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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00000
No faults detected
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Self-diagnosis is complete when "No fault detected" appears after repairs have been made and additional heater functionality has been checked.
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00532
Power supply
*Signal too high /SP
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- Vehicle voltage too high with engine running.
Battery charged using charging unit with excessively high charging voltage.
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- Check alternator and voltage regulator.
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01044
Control unit incorrectly encoded
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- A newly installed additional heater has not been encoded.
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- Encode additional heater
Delete fault memory.
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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01406
No flame formation
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- Constriction or leakage in air intake or in exhaust system.
Fault in fuel supply to additional heater.
Combustion air blower -V6 defective.
Glow plug with flame detector -Q8 defective.
Metering pump -V54 defective.
Leak in additional heater.
Deposits on burner element (only when running additional heater on vegetable oil methyl ester)
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- Check additional heater air intake and exhaust system.
Check fuel delivery
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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01407
Loss of flame
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- Constriction or leakage in air intake or in exhaust system.
Fault in fuel supply to additional heater.
Combustion air blower -V6 defective.
Glow plug with flame detector -Q8 defective.
Metering pump -V54 defective.
Leak in additional heater.
Deposits on burner element (only when running additional heater on vegetable oil methyl ester)
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- Check additional heater air intake and exhaust system.
Check fuel delivery
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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01408
Undervoltage cut-off (fixed value)
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- Voltage falling below specified minimum voltage during additional heater operation.
Contact resistance in wiring to -J162.
Battery not sufficiently charged or defective.
Fixed value for undervoltage cut-off was entered too high.
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- Check alternator and voltage regulator.
=> Electrical System; Repair group 0101-88
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Notes:
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◆ The fixed value for undervoltage cut-off is active with code "00002" or "00012". It can be entered or altered in the "Adaption" function => Page 01-67.
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◆ The fixed value for the undervoltage cut-off is also active with coding "00001" or "00011" but is not displayed. If the voltage value was altered in a control unit encoded to "00002" or "00012" and the control unit is then recoded to "00001" or "00011" this fault can also be displayed in control units that are coded to automatic undervoltage cut-off. The automatic undervoltage cut-off is not provided for the additional heater.
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◆ This fault can only be displayed for vehicles with additional heater in the event of e.g. contact resistance in the connection between additional heater and vehicle battery (the additional heater only operates with the engine running).
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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01409
Repeated loss of flame
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- Constriction or leakage in air intake or in exhaust system.
Fault in fuel supply to additional heater.
Combustion air blower -V6 defective.
Glow plug with flame detector -Q8 defective.
Metering pump -V54 defective.
Leak in additional heater.
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- Check additional heater air intake and exhaust system.
Check fuel delivery
Dismantle additional heater and check gaskets.
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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01410
Heater overheating
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- Air in coolant circuit
Constriction in coolant circuit
Engine coolant pump displacement insufficient
-V55 recirculating pump is not running (only additional heaters with recirculating pump).
Fault at temperature sensor in additional heater control unit -J162.
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- Bleed coolant circuit as specified.
Eliminate constriction in coolant circuit.
Check displacement and coolant circuit.
Perform final control diagnosis => Page 01-106
Replace additional heater.
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Notes:
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◆ The Audi A2 currently has no -V55 recirculating pump for the additional heater installed.
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◆ On vehicles without the recirculating pump for the additional heater, the coolant flow through the additional heater is determined by the engine coolant pump displacement. If this is too low e.g. during engine idling, then this fault may be stored.
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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01411
Temperature sensor -G18
*Defective
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- Fault in additional heater control unit -J162.
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- Replace additional heater.
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01412
Glow plug with flame detector -Q8.
*Implausible signal
*Open circuit
*Short to positive
*Short to earth
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- Fault in wiring between heater control unit -J162 and glow plug with flame detector -Q8.
Glow plug with flame detector -Q8 defective.
Fault in additional heater control unit -J162.
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- Perform final control diagnosis
Replace additional heater.
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Notes:
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◆ If a -Q8 glow plug with flame detector fault is displayed together with the faults "misfire" or "repeated misfire", then first eliminate the cause for these faults.
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◆ Should this fault be displayed also check the connector between control unit -J162 and the glow plug -Q8 for contact resistance (the glow plug is also the flame detector). As a very low current is flowing during interrogation of the flame monitor even a low contact resistance (e.g. due to contact pressure too low) can cause the storing of this fault.
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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01413
Metering pump -V54
*Short to earth
*Open circuit
*Short to positive
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- Fault in wiring between heater control unit -J162 and metering pump -V54.
Metering pump -V54 defective.
Fault in additional heater control unit -J162.
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- Locate and eliminate fault in wiring between -J162, engine control unit, and -V54.
Perform final control diagnosis
Replace additional heater.
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01414
Combustion air blower -V6
*Open circuit
*Short to positive
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- Fault in wiring between heater control unit -J162 and combustion air blower -V6.
Combustion air blower -V6 defective.
Fault in additional heater control unit -J162.
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- Locate and eliminate fault in wiring between -J162 and -V6.
Perform final control diagnosis
Replace additional heater.
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Note:
Contact 6 of connector B is also connected to the engine control unit on the Audi A2 with diesel engine. Engine control unit uses clock signal to metering pump to incorporate fuel consumption of additional heater into consumption signal when engine is running.
=> Relevant Workshop Manual, Diesel Direct Injection and Glow Plug System; Repair group 01
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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01415
Recirculating pump -V55
*Open circuit
*Short to positive
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- -J162 additional heater control unit incorrectly encoded.
Fault in wiring between heater control unit -J162 and recirculating pump -V55.
Recirculating pump -V55 defective.
Fault in additional heater control unit -J162.
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- Check -J162 control unit encoding
Replace additional heater.
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Notes:
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◆ The Audi A2 currently has no -V55 recirculating pump for the additional heater installed.
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◆ If on a vehicle without -V55 recirculating pump the -J162 control unit is encoded for a version with recirculating pump, then this fault is displayed.
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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01416
Fresh air blower actuation signal
*Short to earth
*Open circuit
*Short to positive
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- -J162 additional heater control unit incorrectly encoded.
Fault in wiring to -J162 control unit
Fault in additional heater control unit -J162.
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- Check -J162 control unit encoding
Replace additional heater.
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01443
Not adapted to battery.
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- -J162 additional heater control unit incorrectly encoded.
The basic setting was not performed for auxiliary/additional heater with code "00001" or "00011" after the last coding (currently not provided for on the Audi A2).
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- Check -J162 control unit encoding
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Notes:
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◆ The signal for fresh air blower actuation is intended for the version with auxiliary heater. At present, installation of an auxiliary heater in the Audi A2 is not envisaged.
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◆ The fault "not adapted to battery" is provided for the auxiliary heater version of the -J162 control unit. At present, installation of an auxiliary heater in the Audi A2 is not envisaged.
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◆ The battery voltage drop during auxiliary heater operation is learned and stored in memory via battery adaption.
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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01444
Undervoltage cut-off (automatic)
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- -J162 additional heater control unit incorrectly encoded.
Voltage falling below specified minimum voltage during additional heater operation.
Contact resistance in wiring to -J162.
Battery not sufficiently charged or defective.
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- Check -J162 auxiliary heater control unit encoding => Page
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Notes:
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◆ The cut-off due to undervoltage (Automatic) is intended for the version as auxiliary heater. At present, installation of an auxiliary heater in the Audi A2 is not envisaged.
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◆ The "automatic" value for undervoltage cut-off is active with code "00001" or "00011". It is adapted in function "Basic setting" => Page 01-67.
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◆ If further faults are displayed together with the fault "cut-off due to undervoltage (automatic)" first eliminate the cause for fault "cut-off due to undervoltage (automatic)".
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Display on VAS 5051 and output at printer
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Possible causes of fault
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Fault remedy
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65535
Control unit defective (-J162)
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- Open circuit, contact resistance or loose contact in wiring (terminal 30 or 31) to -J162.
Fault in additional heater control unit -J162.
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- Use current flow diagram to determine and rectify fault in wiring to -J162.
Replace additional heater.
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