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Fuel Injector Circuit Diagnosis



FUEL INJECTOR CIRCUIT DIAGNOSIS

DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection






CIRCUIT/SYSTEM DESCRIPTION
The control module enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The control module controls each fuel injector by grounding the control circuit via a solid state device called a driver.

CIRCUIT/SYSTEM TESTING
1. Remove the air cleaner outlet resonator.
2. Disconnect a fuel injector.
3. With the ignition ON, engine OFF, probe the ignition 1 voltage circuit of the fuel injector with a test lamp that is connected to a good ground. The test lamp should illuminate.
- If the test lamp does not illuminate, repair the open in the ignition 1 voltage circuit between the fuse and the splice.
4. Remove the INJ IGN MOD fuse.
5. Measure the resistance between the INJ IGN MOD fuse to the ignition 1 voltage circuit terminal of a fuel injector with a DMM. All wire circuit resistance should measure less than 2 ohms.
- If the resistance is more than 2 ohms, repair the high resistance in the ignition 1 voltage circuit.
6. Connect the J 44603 into each fuel injector connector one at a time. Crank the engine.
- If the test lamp flashes for each injector, perform the Fuel Injector Diagnosis. Refer to Fuel Injector Diagnosis. Fuel Injector Diagnosis
- If the test lamp does not flash for each injector, test for an open or a short to voltage in the control circuit of the fuel injector, an intermittent or poor connection at the engine control module (ECM), or a faulty ECM.
- If the test lamp remains illuminated at all times for any injector circuit, test for a short to ground in the control circuit of the fuel injector, or a faulty ECM.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Control Module References
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