DTC 54

Fuel Pump/Relay Circuit Diagram:

Code 54 Diagnostic Chart:

CIRCUIT DESCRIPTION
The PCM monitors the status of fuel pump circuit 120. The information is used to compensate fuel delivery based on system voltage. This signal is also used to determine if the fuel pump relay is defective or if fuel pump voltage is lost while engine is running. There should be about 12 volts on circuit 120 for 2 seconds after the ignition is turned "ON", and whenever ignition reference pulses are being received by the PCM.