P1916

P1916

Additional Water Pump Relay Output Stage - Below Limit

NOTE: In naturally aspirated V8 engines, the relay for the additional water pump is only activated by the air-conditioning control module.

Diagnostic conditions
- Battery voltage between 10 V and 16 V
- Time after the engine is started longer than 10 seconds

Possible cause of fault
- Short circuit to ground in triggering wire for additional water pump relay
- Short circuit to ground in activation voltage supply
- DME control module faulty

Affected pins
DME control module connector A, pin 48, and additional water pump relay connector, pin 2

Diagnosis/troubleshooting

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.
- 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.