S10/T10 P/U 2WD V6-262 4.3L VIN Z TBI (1995)
Fuel Pump Relay: Testing and Inspection
With Vehicle Control Module (VCM)
Diagnostic Trouble Code (DTC) P1222 indicates a failure in the fuel pump circuit.
The relay has a terminal to test the fuel pump operation which is a separate terminal located near the fusible 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 TBI 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: 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).
