ELBOW AS 1488389 - Caterpillar

Ensure that the keyswitch is in the OFF position.
Remove the valve cover.
Disconnect each of the injectors that indicate an "OPEN" from the wiring harness. Ensure that each of the connectors from the disconnected injector harness does not touch other components and short to ground.
Attach a jumper wire to both terminals of the injector harness for the two injectors that share a supply line.
Turn the keyswitch to the ON position.
Perform the injector solenoid test at least two times.
Turn the keyswitch to the OFF position.Expected Result:The cylinders with the short in place indicate an "OPEN".Results:
OK - The problem appears to be in the engine harness under the valve cover.Repair: Perform the following repair:
Replace the engine harness under the valve cover.
Run the injector solenoid test in order to check the installation of the new harness before installing the valve covers.
Verify that the repair eliminates the problem.STOP
Not OK - Both injectors indicate "SHORT".Repair: Replace both injectors.Verify that the repair eliminates the problem.STOPTest Step 10. Check the Harness under the Valve Cover for an Open Circuit in the Supply Circuit
Illustration 11 g01147088
Connector terminals for the solenoid connector
Electrical shock hazard. The electronic unit injector system uses 90-120 volts.
Ensure that the keyswitch is in the OFF position.
Remove the valve cover.
Disconnect each of the injectors that indicate an "OPEN" from the wiring harness. Ensure that each of the connectors from the disconnected injector harness does not touch other components and short to ground.
Attach a jumper wire to both terminals of the injector harness for the two injectors that share a supply line.
Turn the keyswitch to the ON position.
Perform the injector solenoid test at least two times.Expected Result:The cylinders with the short in place indicate an "OPEN".Results:
OK - The problem appears to be in the engine harness under the valve cover.Repair: Perform the following repair:
Replace the engine harness under the valve cover.
Run the injector solenoid test in order to check the installation of the new harness before installing the valve covers.
Verify that the repair eliminates the problem.STOP
Not OK - Both injectors indicate "SHORT".Repair: Replace both injectors.Verify that the repair eliminates the problem.STOPTest Step 11. Check the Engine Harness Under the Valve Cover for Short Circuits in the Injector Wires
Electrical shock hazard. The electronic unit injector system uses 90-120 volts.
Ensure that the keyswitch is in the OFF position.
Remove the valve cover.
Disconnect each of the injectors that indicate a "SHORT" from the wiring harness. Ensure that each of the connectors from the disconnected injector harness does not touch other components and short to ground.
Turn the keyswitch to the ON position.
Perform the injector solenoid test at least two times.
Turn the keyswitch to the OFF position.Expected Result:Both cylinders indicate an "OPEN".Results:
OK - Neither of the injector wires are shorted to the engine.Repair: Leave the injector wires disconnected. Proceed to Test Step 12.
Not OK - There is a short in the injector harness under the valve cover.Repair: Replace the injector harness under the valve cover.Verify that the repair eliminates the problem.STOPTest Step 12. Check for a Short Circuit in the Supply Line to