Typhoon V6-262 4.3L Turbo (1993)
Fuel Pump Relay: Description and Operation
Fuel Pump Relay Circuit Operation
DTC 54 indicates a failure in the fuel pump circuit.
The fuel pump relay has a terminal to test the fuel pump operation. This is either a separate terminal located near the relay or along the ECM harness or
at terminal "G" in the DLC connector. By applying voltage at this terminal, it can be determined if the fuel pump will operate.
Refer to Testing and Inspection for diagnosis of the fuel pump relay circuit.
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).
