Fuel Injector Circuit Diagnosis

Fuel Injector Circuit Diagnosis

Refer to Engine Controls Schematics Fuel Injectors .

Diagnostic Aids

* The PCM has integrated circuits that are fault protected. Therefore, if a circuit has failed, the integrated circuits may not be damaged. If this is the case, the IC will keep the circuit open until you have corrected the fault in the circuit.
* When you have corrected the fault, reinstall the PCM.
* Inspect the circuit.
* Replace the PCM only if the circuit is still inoperative.

Test Description

The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the ignition feed circuit to the injectors are OK.
6. This step determines if the injector control circuits are OK.
8. This step determines if there is an internal PCM short to ground for an injector control circuit.