P1674

P1674

497 Engine compartment purge fan output stage - open circuit

Diagnosis conditions
- Engine running
- Battery voltage greater than 7 V
- Engine compartment purge fan switched on once
- Engine compartment temperature greater than 75 °C
- Front and rear lids closed

NOTE: The triggering wire for relay terminal 85 is monitored.

The rear lid may be opened to speed up the warming process. In order to proceed with the diagnosis, the rear lid must then be closed.

Possible fault cause
- Open circuit
- Relay faulty
- DME control module faulty

Affected terminals
Terminal II/20

Diagnosis/troubleshooting

Part 1:

Part 2:

497 Engine compartment purge fan output stage - short circuit to ground

Diagnosis conditions
- Engine running
- Battery voltage greater than 7 V
- Engine compartment purge fan switched on once
- Engine compartment temperature greater than 75 °C
- Front and rear lids closed

NOTE: The triggering wire for relay terminal 85 is monitored.

The rear lid may be opened to speed up the warming process. In order to proceed with the diagnosis, the rear lid must then be closed.

Possible fault cause
- Short circuit to ground
- Relay faulty
- DME control module faulty

Affected terminals
Terminal II/20

Diagnosis/troubleshooting







497 Engine compartment purge fan output stage - short circuit to B+

Diagnosis conditions
- Engine running
- Battery voltage greater than 7 V
- Engine compartment purge fan switched on once
- Engine compartment temperature greater than 75 °C
- Front and rear lids closed

NOTE: The triggering wire for relay terminal 85 is monitored.

The rear lid may be opened to speed up the warming process. In order to proceed with the diagnosis, the rear lid must then be closed.

Possible fault cause
- Short circuit to B+
- Relay faulty
- DME control module faulty

Affected terminals
Terminal II/20

Diagnosis/troubleshooting