S10/T10 P/U 2WD L4-2.2L VIN 4 (1995)
Fuel Pump Relay: Testing and Inspection
Diagnostic Trouble Code (DTC) 54 indicates a failure in the fuel pump circuit.
Two types of fuel pump relays are used. The Utility series uses one type while the Pickup series uses the other type. The relays have the same
function, but terminal arrangement is different. The relays have a terminal to test the fuel pump operation.
The fuel pump prime is a separate terminal located near the relay or in the drivers fenderwell near the fuseable link cluster. By applying voltage at
this terminal, it can be determined if the fuel pump will operate. This terminal will also prime the fuel line to the fuel injection unit.
Refer to CHART A-5 for diagnosis of the fuel pump relay circuit. Refer to A Charts. Under Computer and Controls/System
Diagnosis/Procedures. See: Powertrain Management/Computers and Control Systems/Testing and Inspection
An inoperative fuel pump will cause a "no start" condition. A fuel pump which does not provide enough pressure can result in poor performance.
An inoperative fuel pump relay can result in long cranking times, particularly if the engine is cold. The oil pressure switch will turn "ON" the fuel
pump, as soon as oil pressure reaches about 28 kPa (4 psi).
