BRACKET 3072139 - 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 power is not removed.
Disconnect the connectors for the valve cover base.
Turn the keyswitch to the ON position.
Fabricate a jumper wire 100 mm (4 inch) long with Deutsch pins on both ends of the wire.
Insert one end of the jumper wire into the terminal for the suspect injector's supply wire. Insert the other end of the jumper wire into the terminal for the suspect injector's return wire.
Perform the "Injector Solenoid Test" at least two times.
Repeat this test for each suspect injector. Stop the "Injector Solenoid Test" before handling the jumper wire.Expected Result:Cat ET displays "Open" for the cylinder with the jumper wire.Results:
OK - Cat ET displays "Open" for the cylinder with the jumper wire. There is a problem in the wiring between the ECM and the valve cover base. There may be a problem with the ECM. Proceed to Test Step 8.
Not OK - Cat ET displays "Short" for the cylinder with the jumper wire. The harness between the ECM and the valve cover base does not have an open circuit. Proceed to Test Step 7.Test Step 6. Check the Harness between the ECM and the Valve Cover Base 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 power is not removed.
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 "Open" on Cat ET.Results:
OK - All cylinders indicate "Open" on Cat ET. Proceed to Test Step 7.
Not OK - One or more cylinders indicate "Short" on Cat ET. Note the cylinders that indicate "Short". Proceed to Test Step 8.Test Step 7. Check the Injector Harness Under the Valve Cover for an Open Circuit or 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 power is not removed.
Remove the valve cover.
Disconnect the harness connector for each injector solenoid that indicates a "Short" on Cat ET. Ensure that each disconnected connector does not touch other components and create a short circuit.
Turn the keyswitch to the ON position.
Perform the "Injector Solenoid Test" at least two times.Expected Result:All of the injector solenoids that were disconnected indicate "Open" on Cat ET.Results:
OK - All of the injector solenoids that were disconnected indicate "Open" on Cat ET.Repair: Replace the faulty injector.Perform the "Injector Solenoid Test".Verify that the problem is resolved.STOP
Not OK - At least one of the injector solenoids that were disconnected still indicate "Short" on Cat ET. There is a problem with the wiring harness inside the valve cover. There may be a problem with a connector.Repair: Inspect the connectors for moisture and for corrosion. Repair the wiring and/or the connector, when possible. Replace