Injector Solenoid Circuit - Test. Use this procedure for the following conditions. Inspect the Electrical Connectors and the Wiring, страница 4

Test Step 4. Perform the "Injector Solenoid Test"

1. Start the engine.

2. Allow the engine to warm up to normal operating temperature 77 °C (171 °F).

3. Stop the engine.

4. Restore the electrical power to the ECM.

5. Access the "Injector Solenoid Test" by accessing the following display screens:
• "Diagnostics"
• "Diagnostic Tests"
• "Injector Solenoid Test"

6. Activate the "Injector Solenoid Test".

7. As each solenoid is energized by the ECM, an audible click can be heard at the valve cover. Allow the "Injector Solenoid Test" to continue until each cylinder is activated at least two times.

Expected Result:

All cylinders indicate "OK" on Cat ET.

Results:

• OK - There is not an electronic problem with the injectors at this time.

Repair: The problem appears to be resolved. There may be an intermittent problem in the harness. The problem may have been caused by a poor electrical connection in a connector.If the codes continue to be logged, refer to Troubleshooting, "Electrical Connectors - Inspect".If the engine is misfiring or if the engine has low power, refer to Troubleshooting, "Engine Misfires, Runs Rough or Is Unstable" or Troubleshooting, "Low Power/Poor or No Response to Throttle".

STOP

• Not OK - "Open" - Note the cylinder that indicates "Open". Proceed to Test Step 5.
• Not OK - "Short" - Note the cylinder that indicates "Short". Proceed to Test Step 6.

Test Step 5. Check the Harness between the ECM and the Valve Cover Base for an Open Circuit

1. Remove the electrical power from the ECM.

2. Disconnect the appropriate P300 connector at the valve cover base.

3. Restore the electrical power to the ECM.

4. Fabricate a jumper wire that will be long enough to short circuit two terminal locations at the P300 connector. Crimp connector pins to both ends of the jumper wire.

5. Insert one end of the jumper wire into the P300 connector socket for the suspect injector's supply wire. Insert the other end of the jumper wire into the P300 connector socket for the suspect injector's return wire. This will replace the injector solenoid with a short circuit.