COUPLING-SHAFT 1417920 - Caterpillar

Electrical shock hazard. The electronic unit injector system uses 67-73 volts.
Turn the keyswitch to the OFF position. A strong electrical shock hazard is present if the keyswitch is not turned OFF.
Disconnect the connectors from the valve cover base.
Turn the keyswitch to the ON position.
Perform the "Injector Solenoid Test" at least two times. Expected Result:All cylinders indicate "Current Below Normal".Results:
OK - All cylinders indicate "Current Below Normal". Proceed to Test Step 10.
Not OK - One or more cylinders indicate "Current Above Normal". Note the cylinders that indicate "Current Above Normal". Proceed to Test Step 9.Test Step 9. Check the ECM for a Short Circuit
Electrical shock hazard. The electronic unit injector system uses 67-73 volts.
Turn the keyswitch to the OFF position. A strong electrical shock hazard is present if the keyswitch is not turned OFF.
Disconnect the P2 connector from the ECM and check for evidence of moisture entry.
Turn the keyswitch to the ON position.
Perform the "Injector Solenoid Test" at least two times. Expected Result:All cylinders indicate "Current Below Normal" when connector P2 is disconnected from the ECM.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 the logged diagnostic codes after completing this test step.Results:
OK - The short circuit is in the engine harness.Repair: The fault is most likely to be in one of the wires to the injector. Inspect the connectors for moisture and for corrosion. Also, check the wire insulation for damage and for strands that are exposed.Repair the engine harness or replace the engine harness, as required. Clear all diagnostic codes after completing this test step.Verify that the repair eliminates the fault.STOP
Not OK - There may be a fault with the ECM.Repair: Perform the following repair:
Make sure that the latest flash file for the application is installed in the ECM. Refer to Troubleshooting, "Flash Programming".
Contact the Technical Communicator. Note: This consultation can greatly reduce the repair time.
If the Technical Communicator recommends the use of a test ECM, install a test ECM. Refer to Troubleshooting, "Replacing the ECM".
Remove the jumper wire from the P2 connector and reinstall the injector wires.
Perform the "Injector Solenoid Test".
If the fault is eliminated with the test ECM, reconnect the suspect ECM.
If the fault returns with the suspect ECM, replace the ECM.
Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault. STOPTest Step 10. Check the Engine Harness Under the Valve Cover for a Short Circuit
Electrical shock hazard. The electronic unit injector system uses 67-73 volts.
Turn the keyswitch to the OFF position. A strong electrical shock hazard is present if the keyswitch is not turned OFF.
Remove the valve cover.
Disconnect each of