Possible Causes
- Purpose of the DTC
- To detect a stuck low failure on the signal line between the engine control module and the fuel pump driver module
- Electrical Cause
- Yes
- Mechanical Cause
- No
- Control Module Signal Name
- EFPC - Output PWM signal from engine control module
- PWM - Input PWM signal to fuel pump driver module
- Monitor Description
- When the fuel pump is being controlled by the engine control module, an internal hardware check is performed on the status of the output pin. If the engine control module is requesting fuel pump duty within the range 10%-90% it is possible to detect a high/low circuit failure within 500ms
- Prioritized List of Possible Causes
- The engine control module has detected a ground measurement for a period longer than expected or has detected a ground measurement when another value was expected
- Output PWM signal from engine control module to fuel pump driver module circuit short circuit to ground, high resistance
- Connector is disconnected, connector pin is backed out, connector pin corrosion
- Fuel pump driver module failure
- Engine control module failure