Chart A-4 Injector Circuit Diagnosis

Chart A-4 Injector Circuit Diagnosis:

Wiring Diagram For Chart A-4 Injector Circuit Diagnosis:

CHART A-4 - INJECTOR CIRCUIT DIAGNOSIS


CIRCUIT DESCRIPTION:

This chart should only be used if diagnosis in CHART A-3 indicated an injector circuit problem. If both injector circuits fail to blink when tested, diagnose one injector circuit at a time.


TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. This test will determine if the ignition module is generating a reference pulse, if the wiring is at fault or if the PCM is at fault. By touching and removing a test light, connected to 12 volts, to CKT 430, a reference pulse should be generated. If injector test light blinks, the PCM and wiring are OK.


2. This step tests for 12 volts to the injector. It will also determine if there is a short to voltage on the PCM side of the circuit.

3. This test checks for continuity to the PCM.