SPOOL 1390193 - Caterpillar

Turn the keyswitch to the OFF position. A strong electrical shock hazard is present if the keyswitch is not turned OFF.
Disconnect connector P2 from the ECM.
Remove the supply wire and the return wire for the suspect injector from connector P2. Install a jumper wire into connector P2 in order to provide a short between the supply and the return of the suspect injector.
Reinstall connector P2 to the ECM.
Turn the keyswitch to the ON position.
Perform the "Injector Solenoid Test" at least two times. Expected Result:The electronic service tool displays "Current Above Normal" for the cylinder with the jumper wire.Note: Shorting a shared supply will affect the status of three injectors. Ignore the status of the other injectors that are on the shared shared supply.Results:
OK - The ECM is OK.Repair: If three injectors that share a supply indicate "Open Circuit" fault codes, the open circuit is probably caused by a faulty ECM. Repair the engine harness or replace the engine harness, as required.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOP
Not OK - There may be a fault with the ECM.Repair: Perform the following repair:
Make sure that the latest flash file for the application is installed in the ECM. Refer to Troubleshooting, "Flash Programming".
Contact the technical communicator at the Caterpillar dealer. Note: This consultation can greatly reduce the repair time.
If the technical communicator recommends the use of a test ECM, install a test ECM. Refer to Troubleshooting, "Replacing the ECM".
Remove the jumper wire from connector P2 and reinstall the injector wires.
Perform the "Injector Solenoid Test".
If the fault is resolved with the test ECM, reconnect the suspect ECM.
If the fault returns with the suspect ECM, replace the ECM.
Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault. STOPTest Step 8. 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 keyswitch is not turned OFF.
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 "Current Below Normal".Results:
OK - All cylinders indicate "Current Below Normal". Proceed to Test Step 10.
Not OK - One or more cylinders indicate "Current Above Normal". Note the cylinders that indicate "Current Above Normal". Proceed to Test Step 9.Test Step 9. Check the ECM 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 keyswitch is not turned OFF.
Disconnect connector P2 from the ECM and check for evidence of moisture entry.
Turn the keyswitch to the ON position.
Perform the "Injector Solenoid Test" at least two times. Expected Result:All cylinders indicate "Current Below Normal" when connector P2 is disconnected from