RENR5042-02 159 Troubleshooting Section B. Disconnect the connector from the valve cover base. Repair the engine harness or replace the engine harness, as required. Clear all diagnostic codes after completing this test step. C. Turn the key switch to the ON position. Verify that the repair eliminates the problem. D. Perform the “Injector Solenoid Test” at least two times. STOP. Expected Result: Not OK All cylinders do not indicate when the P2 connector is disconnected. There may be a problem with the ECM. All cylinders indicate “Open”. Results: Repair: Perform the following procedure: OK All cylinders indicate “Open”. Proceed to Test Step 10. 1. Reconnect the P2 ECM connector.
Not OK – One or more cylinders indicate “Short”. Note the cylinders that indicate “Short”. Proceed to Test Step 9. 2. Temporarily connect a test ECM. 3. Perform the “Injector Solenoid Test”. Test Step 9. Check the ECM for a Short Circuit If the test ECM fixes the problem, reconnect the suspect ECM. If the problem returns with the suspect ECM, replace the ECM. Verify that the repair eliminates the problem. STOP. Electrical shock hazard. The electronic unit injec- tor system uses 90-120 volts. Test Step 10. Check the Engine Harness under the Valve Cover for a Short Circuit A. Turn the key switch to the OFF position.
A strong electrical shock hazard is present if the key switch is not turned off. Electrical shock hazard. The electronic unit injec- tor system uses 90-120 volts. B. Disconnect the P2 connector. Check the P2 and J2 connectors for evidence of moisture entry. C. Turn the key switch to the ON position. A. Turn the key switch to the OFF position. A strong electrical shock hazard is present if the key switch is not turned off. D. Perform the “Injector Solenoid Test” at least two times. B. Remove the valve cover. Expected Result: C. Disconnect each of the injectors that indicate a “Short” from the wiring harness.
Ensure that the disconnected connectors do not touch other components and create a short circuit. All cylinders indicate “Open” when the P2 connector is disconnected. Note: When the engine harness is disconnected, all of the diagnostic codes for supply voltage to the sensors will be active. This is normal. Clear all of these diagnostic codes after completing this test step. D. Turn the key switch to the ON position. E. Perform the “Injector Solenoid Test” at least two times. Results: Expected Result: OK All cylinders indicate when the P2 connector is disconnected. The short circuit is in the engine harness. All of the injectors that were disconnected indicate “Open”. Results: Repair:
The problem is most likely in the common wire to the injector. Inspect the connectors for moisture and for corrosion. Also, check the common wire for exposed wires. OK All of the injectors that were disconnected indicate “Open”. The common wire is not shorted to the engine.