Indicated on display | Possible fault cause | Fault elimination |
No fault recognized! | The self-diagnosis is finished If “No fault recognized” appears after completing repairs. |
00546 | | |
Data wiring defective. | | |
| Implausible signal. | No signal or implausible signal on the “W” wiring between the immobilizer control unit and the engine control unit or the fuel shut-off valve control unit. | –
| Check wiring for open circuit or short circuit. |
|
| | The baud rate (data transmission rate) of the immobilizer control unit is incorrect. | –
| Code the control unit and input the correct baud rate → Chapter. |
|
| | Incorrect operation: The ignition was immediately switched back on after stopping the engine (i.e. during the shutdown phase). | –
| Switch ignition off, wait at least 10 seconds, switch ignition back on and then select function 02 “Read fault memory” again → Chapter. |
|
| | Immobilizer control unit -J362- defective. | –
| Replace immobilizer control unit -J362- if necessary. |
|
01128 | | |
Immobilizer reading coil -D2-. | 3-pin connector not connected at control unit or reader coil and wiring defective. | –
| Check connector, reader coil and wiring (visual check), if necessary renew reader coil. |
|
| | Immobilizer control unit -J362- defective. | –
| Replace immobilizer control unit -J362- if necessary. |
|
01176 | | |
Key | | |
| Signal too low. | Reader coil or wire defective (contact resistance/loose contact). | –
| Check reader coil with wiring and connector (visual check), if necessary renew reader coil. |
|
| | Electronic component in ignition key (transponder) missing or does not work. Wrong transponder type in ignition key. | –
| Renew ignition key, perform new adaptation for all ignition keys and check operation → Chapter. |
|
| Not authorized. | Key fits mechanically, but adaptation routine has not been performed. | –
| Perform new adaptation for all ignition keys and check operation → Chapter. |
|
01177 | | |
Engine control unit. | | |
| Not authorized. | Adaptation routine not performed for engine control unit or fuel shut-off valve control unit. W-wire between the components is OK. | –
| Perform adaptation routine for engine control unit or fuel shut-off valve control unit → Chapter. |
|
01179 | | |
Key programming incorrect. | Ignition key adaptation is faulty. | –
| Re-match all ignition keys and check operation → Chapter. |
|
| | Electronic component in ignition key (transponder) missing or does not work. Wrong transponder type in ignition key. | –
| Renew ignition key, perform new adaptation for all ignition keys and check operation → Chapter. |
|
01181 | | |
Initialisation: only 2 keys learned. | During initial adaptation the ignition was switched on a third time with one of the ignition keys for longer than 1 second . Only two ignition keys can be adapted during initial adaptation. | |
01202 | | |
Diagnosis lead. | | |
| Short circuit. | Short circuit between wires of connector, 6-pin, chambers 2 and 3 (“W” and “K”) on immobilizer control unit -J362-. | –
| Check connection and, if necessary, rectify fault referring to current flow diagram. |
|
| | Short circuit between wires of connector, 8-pin, chambers 7 and 8 (“W” and “K”) on immobilizer control unit -J362-. | –
| Check connection and, if necessary, rectify fault referring to current flow diagram. |
|
| | Short circuit between wires of connector, 10-pin, chambers 7 and 8 (“W” and “K”) on immobilizer control unit -J362-. | –
| Check connection and, if necessary, rectify fault referring to current flow diagram. |
|
| | Immobilizer control unit -J362- defective. | –
| Replace immobilizer control unit -J362- if necessary. |
|
01237 | | |
Fuel shut-off valve -N109-. | | |
| Defective. | Fuel shut-off valve control unit or fuel shut-off valve defective. | –
| Remove fuel shut-off valve control unit and disconnect electric wiring. |
–
| Temporarily apply battery voltage (term. 30) to fuel shut-off valve (use measuring tool set -V.A.G 1594/C-): |
t
| Fuel shut-off valve clicks audibly ⇒ renew fuel shut-off valve control unit. |
t
| Fuel shut-off valve does not click ⇒ renew fuel shut-off valve. |
|
01312 | | |
Powertrain data bus. | | |
| Defective. | Fault in data wiring. Powertrain data bus in Bus off mode. | –
| Check control unit coding. |
–
| Read fault memories of all control units connected to powertrain data bus and rectify any faults. |
–
| Check data bus referring to current flow diagram. |
|
01314 | | |
Engine control unit. | | |
| No communications. | Data received from engine control unit via powertrain data bus not OK. | –
| Read fault memory of engine control unit and rectify any faults. |
–
| Check data bus to engine control unit referring to current flow diagram. |
|
65535 | | |
Control unit. | | |
| Defective. | Short circuit between wires of connector, 6-pin, chambers 2 and 3 (“W” and “K”). | –
| Rectify fault referring to current flow diagram. |
|
| | Short circuit between wires of connector, 8-pin, chambers 7 and 8 (“W” and “K”). | –
| Rectify fault referring to current flow diagram. |
|
| | Short circuit between wires of connector, 10-pin, chambers 7 and 8 (“W” and “K”). | –
| Rectify fault referring to current flow diagram. |
|
| | The immobilizer control unit -J362- does not recognise the correct Baud rate (data transfer speed). | –
| Replace immobilizer control unit -J362-. |
|
| | Immobilizer control unit -J362- cannot communicate via data bus. | –
| Replace immobilizer control unit -J362-. |
|
| | Immobilizer control unit -J362- defective. | –
| Replace immobilizer control unit -J362-. |
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