Powertrain Controls - ECM/PCM

DTC 54 Fuel Pump Relay Chart:

DTC 54 - Fuel Pump Relay (Low Voltage):

CIRCUIT DESCRIPTION
The status of the fuel pump CKT 120 is monitored by the Powertrain Control Module (PCM) at terminal "B12" and is used to compensate fuel delivery based on system voltage. This signal is also used to store a Diagnostic Trouble Code (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 WHEN
The voltage at terminal "B12" 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 the diagnosis of an engine that "Cranks But Will Not Run."

ACTION TAKEN (PCM WILL DEFAULT TO)
The PCM will enable the Malfunction Indicator Lamp (MIL).

DTC 54 WILL CLEAR WHEN
Conditions for fault are no longer present and TECH 1 scan tool "clear DTCs" function is used, 50 ignition switch keycycles have passed with no further faults, or ignition switch is turned "OFF" and ECM "B" fuse is removed for 10 seconds.

DIAGNOSTIC AIDS
Refer to Diagnosis By Symptom / Intermittents. - Intermittent Malfunctions