Powertrain Controls - ECM/PCM

DTC 54 (PCM):

Fuel Pump Circuit (PCM):

Circuit Description:
The status of the fuel pump CKT 120 is monitored by the PCM at terminal "F6" and is used to compensate fuel delivery based on system voltage. This signal is also used to store a DTC if the fuel pump relay is defective or fuel pump voltage is lost while the engine is running. There should be about 12 volts on CKT 120 for at least 2 seconds after the ignition is turned "ON," or any time reference pulses are being received by the PCM.

DTC 54 will set if the voltage at "F6" is less than 2 volts for 1.5 seconds since the last reference pulse was received. This DTC is designed to detect a faulty relay, causing extended crank time, and the DTC will help diagnose an engine that "Cranks But Will Not Run."

If a fault is detected during start-up, the "Service Engine Soon" light will stay "ON" until the ignition is cycled "OFF."

Diagnostic Aids:
Refer to "Intermittents" - Intermittent Malfunctions