SUPPORT AS 4742903 - Caterpillar

Illustration 6 g01409177
Terminal locations at the valve cover connector (Terminal 1) Injector 1 supply (Terminal 2) Injector 2 supply (Terminal 3) Injector 3 supply (Terminal 4) Injector 4 supply (Terminal 5) Injector 5 supply (Terminal 6) Injector 6 supply (Terminal 8) Injector 5 & 6 return (Terminal 10) Injector 3 & 4 return (Terminal 12) Injector 1 & 2 return
Insert one end of the jumper wire into the connector socket for the suspect injector's supply wire. Insert the other end of the jumper wire into the connector socket for the suspect injector's return wire. This will replace the injector solenoid with a short circuit.
Restore electrical power to the ECM.
Perform the "Injector Solenoid Test" at least two times.
Repeat this test for each suspect circuit. Stop the "Injector Solenoid Test" before handling the jumper wire. Restore the wiring to the original configuration.Expected Result:Cat ET displays "Short" for each of the circuits that were jumpered.Results:
OK - Cat ET displays "Short" for each circuit that was jumpered. The harness between the ECM and the valve cover connector does not have an open circuit. Proceed to Test Step 7.
Not 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 connector. Proceed to Test Step 8.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 90-120 volts.
Remove