42 Fuel Pump Relay Control Circuit

42 FUEL PUMP RELAY CONTROL CIRCUIT





Operation of the fuel pump relay is controlled by the Powertrain Control Module (PCM) which supplies a ground path for the relay's coil at pin 38. The relay is energized at the initial key-on for a brief amount of time, and when the PCM recognizes an engine RPM signal from the crankshaft position sensor.

The DTC is stored in memory when the PCM recognizes high voltage at pin 38 when the fuel pump relay is energized, or low voltage at pin 38 when the fuel pump relay is de-energized.

This malfunction could possibly be caused by problems with any of the following components:

- Fuel pump relay
- Fuel pump relay electromagnet wiring and related connectors (open or short)
- PCM