Powertrain Controls - ECM/PCM

DTC 54:

Fuel Pump Wiring Schematic:

CIRCUIT DESCRIPTION
The status of the fuel pump circuit 120 is monitored by the Powertrain Control Module (PCM) at terminal "A6." The voltage signal is used by the PCM to determine actual fuel pump speed and therefore fuel pressure. This information aids in determining correct injector pulse width for fuel delivery. Diagnostic Trouble Code (DTC) 54 enables the technician to determine if a circuit or relay error has occurred in the fuel pump circuit. This diagnostic trouble code occurs any time a voltage less than the calibrated minimum value has been sensed on circuit 120. Diagnosing extended crank time or "Cranks But Won't Run" is aided with this DTC.

DTC 54 WILL SET WHEN
Fuel pump voltage at terminal "A6" is above 14 volts or below 7 volts for 3 seconds.

ACTION TAKEN (PCM) WILL DEFAULT TO
The oil pressure switch will provide a current path for the fuel pump when oil pressure becomes great enough to close the contacts. The Malfunction Indicator Lamp (MIL) will become illuminated.

DTC 54 WILL CLEAR WHEN
A current DTC 54 will clear when voltage at the fuel pump monitor is sensed within the calibrated voltage threshold. A History DTC 54 will clear after 50 consecutive ignition key cycles without a current DTC 54 being stored.