Code 54, Fuel Pump Circuit

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Suburban, 1994 GMC Rally Camper Special, and 1994 GMC Rally. However, it is still accessible from the selected car via links, so may be relevant.

The status of fuel pump signal is monitored by the control module and is used to compensate fuel delivery based on system voltage. Signal is also used to store Code 54 if fuel pump relay is defective or if relay voltage is lost after engine is running. Voltage should be present at fuel pump signal terminal of control module the first 2 seconds after ignition is turned on and anytime reference (RPM) pulses are being received by control module.

Fig 1: Code 54 Schematic ("G" Series) Fuel Pump Circuit

Fig 2: Code 54 Schematic ("P" Series A/T) Fuel Pump Circuit

Fig 3: Code 54 Schematic ("P" Series M/T) Fuel Pump Circuit

Fig 4: Code 54 Flow Chart Fuel Pump Circuit