Test Description

Test Number 1)  This procedure applies direct voltage to run the fuel pump. If the pump runs, it may be a fuel pump relay circuit problem which the following steps will locate.

Test Number 2)  This step checks voltage from the battery and the ground circuit to the relay.

Test Number 3)  This test determines if there is voltage from the ECM, terminal "A1", to terminal "D" on the relay connector.

Test Number 4)  This completes the fuel pump relay circuit but if this diagnosis was used because the engine would not run then oil pressure switch should also be diagnosed.