P1428

P1428

Brake Booster Pump Relay Output Stage - Below Limit

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

Possible cause of fault
- Short circuit to ground in control line
- Short circuit to ground in B+ supply
- DME control module faulty

Affected terminals
DME control module connector A, pin 22, and brake booster pump relay slot, pin 2

Diagnosis/troubleshooting

NOTE:
- The pump running time shown in the 9588 Porsche System Tester II serves as an indication of the wear-and-tear of the pump.
- It can be reset again by replacing the pump; this information is still transferred into the new DME control module when the DME control module is replaced.

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.