SENSOR GP-POS 2160281 - Caterpillar

Electrical shock hazard. The electronic unit injector system uses 90-120 volts.
Remove the electrical power from the ECM.
Disconnect the appropriate valve cover entry connector at the valve cover base.
Restore the electrical power to the ECM.
Fabricate a jumper wire that will be long enough to short circuit two terminal locations at the valve cover entry connector. Crimp connector pins to both ends of the jumper wire.
Insert one end of the jumper wire into the appropriate connector socket for the supply wire for the suspect injector. Insert the other end of the jumper wire into the connector socket for the return wire for the suspect injector. The jumper wire replaces the injector solenoid with a short circuit. Refer to Illustrations 4 and 5 to identify the correct terminals.
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 circuit that is jumpered.Results:
OK - Cat ET displays "Short" for each circuit that was jumpered. The harness between the ECM and the P300 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 entry connector. There may be a problem with the ECM. 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 the electrical power from the ECM.
Disconnect the appropriate valve cover entry connector.
Restore the electrical power to the ECM.
Perform the "Injector Solenoid Test" at least two times. Expected Result:All of the cylinders in the appropriate bank indicate "Open" on Cat ET.Results:
OK - All cylinders indicate "Open" on Cat ET. The ECM and the engine harness are OK. 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 90-120 volts.
Remove the electrical power from the ECM.
Remove the valve cover in order to gain access to the suspect injector.
Disconnect the harness connector from the suspect injector.
Illustration 6 g01147088
Connector terminals for the injector solenoid
Thoroughly clean the terminals on the injector solenoid and on the harness connector.
Use a jumper wire to short circuit the connector terminals for the suspect injector. The jumper wire will effectively replace the injector solenoid with a short circuit.
Restore the electrical power to the ECM.
Perform the "Injector Solenoid Test" at least two times. Note: The injector solenoid that shares the supply wire of the injector that is short circuited may indicate a false test result. Disregard this test result.
Remove the electrical power from the ECM.
Remove the jumper wire from the injector