COUNTERWEIGHT GP 4550330 - Caterpillar

Electrical shock hazard. The electronic unit injector system uses 90-120 volts.
Turn the keyswitch to the OFF position. A strong electrical shock hazard is present if the keyswitch is not turned off.
Disconnect the harness connectors for the affected cylinder at the cylinder head.
Fabricate a jumper wire that is long enough to create a test circuit across the harness connector at the cylinder head. Crimp connector pins to each end of the jumper wire.
Connect the jumper wire between terminal locations 1 (supply) and 2 (return). This will effectively create a short circuit for the cylinder.
Turn the keyswitch to the ON position.
Perform the "Injector Solenoid Test" at least two times.Expected Result:Cat ET displays "Short" for the cylinder with the jumper wire.Results:
OK - Cat ET displays "Short" for the cylinder with the jumper wire. The harness between the ECM connector and the harness connector at the cylinder head is OK. Remove the jumper wire. Connect the harness connectors. Proceed to Test Step 7.
Not OK - Cat ET displays "Open" for the cylinder with the jumper wire. The ECM did not detect the jumper wire. There is an open circuit in the wiring harness between the J2 ECM connector and the harness connector at the cylinder head.Repair: Repair the problem with the harness. Replace parts, if necessary. Start the engine. Verify that the problem is resolved.STOPTest Step 7. Check the Injector Harness under the Valve Cover for an Open Circuit
Electrical shock hazard. The electronic unit injector system uses 90-120 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.
Carefully perform a visual inspection of the wiring harness under the valve cover. Look for the following problems:
Improper routing of the wire harness
Missing clamps or other hardware
Loose connectors or damaged connectors
Damage that is caused by excessive heat
Damage that is caused by chafing
Inspect the connectors on the harness under the valve cover. Perform the following procedure on each wire that relates to the cylinder that has the code:
Inspect the seal around each wire. Verify that the seal is sealing correctly.
Pull on each wire in order to verify that the wire and the terminal are correctly installed.
Disconnect the harness connector from the suspect injector. Carefully inspect each terminal for debris, for moisture, and for corrosion. Verify that the seals and wedges are properly installed.
Connect a jumper wire across the terminals in the harness connector for the cylinder that has the code. This will effectively replace the injector solenoid with a short circuit.
Turn the keyswitch to the ON position.
Perform the "Injector Solenoid Test" at least two times.Expected Result:Cat ET displays "Short" for the cylinder with the jumper wire.Results:
OK - Cat ET displays "Short" for the cylinder with the jumper wire. The wiring is OK. There is a problem with the injector.Repair: Perform the following procedure:
Replace the faulty injector. Install the valve cover.
Load the trim file for the new injector into the ECM.
Use Cat ET to perform a Fuel System Verification Test. This will clear