P1657
P1657Overrun Recirculating Air Solenoid Valve Output Stage - Open Circuit
Diagnostic conditions
- Time after the engine is started longer than 10 seconds
- Battery voltage between 10 V and 16 V
Possible cause of fault
- Open circuit in control line
- Open circuit in B+ supply
- Disconnection point KE7 - no connection
- Disconnection point K - no connection
- Fuse FE11 faulty (fuse carrier in E-box, radiator tank)
- Overrun recirculating air solenoid valve faulty
- DME control module faulty
Affected terminals
DME control module connector A, pin 9, and overrun recirculating air solenoid valve connector, pin 1
Diagnosis/troubleshooting
NOTE:
- The wiring for DME control module connector A, pin 9, and overrun recirculating air solenoid valve connector, pin 1, is routed via the K plug connection, pin 7.
- The wiring for fuse FE11 and overrun recirculating air solenoid valve connector, pin 2, is routed via the KE7, pin 1, plug connection.
NOTE: If connector A is disconnected from the DME control module and the ignition is or was switched on, the 'DME Control Module TIMEOUT' fault is recorded in many control modules.
NOTE: If control module connector A was disconnected from the DME in the course of troubleshooting or if the voltage supply was interrupted elsewhere (battery, fuse), the throttle adjusting unit must be adapted.
