UNDERCARRIAGE AR 2208151 - Caterpillar

Illustration 6 g01203187
P3 terminals that are associated with the injector solenoids (harness side of connector)
(P3-1) Injector 12 return
(P3-2) Injector 10 return
(P3-3) Injector 8 return
(P3-4) Injector 6 return
(P3-5) Injector 4 return
(P3-6) Injector 2 return
(P3-7) Injectors 10 & 12 supply
(P3-8) Injectors 6 & 8 supply
(P3-9) Injectors 2 & 4 supply
Illustration 7 g01161304
P4 terminals that are associated with the injector solenoids (harness side of connector)
(P4-1) Injector 1 return
(P4-2) Injector 3 return
(P4-3) Injector 5 return
(P4-4) Injector 7 return
(P4-5) Injector 9 return
(P4-6) Injector 11 return
(P4-7) Injectors 1 & 3 supply
(P4-8) Injectors 5 & 7 supply
(P4-9) Injectors 9 & 11 supply
Insert one end of the jumper wire into the P300 connector socket for the suspect injector's supply wire. Insert the other end of the jumper wire into the P300 connector socket for the suspect injector's return wire. This will replace the injector solenoid with a short circuit.
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 circuits that was 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 P300 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 P300 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