SHOE-TRACK 7T5968 - Caterpillar

Illustration 3 g01151140
Breakout T
(3) Sensor common
(15) Secondary fuel tank level
(26) Primary fuel tank level
Turn the key switch to the OFF/RESET position.
Disconnect the J1/P1 ECM connector. Thoroughly inspect both halves of the J1/P1 ECM connector for signs of corrosion or moisture.
Install a 140-2266 Cable (Seventy-Pin Breakout) between the J1 and P1 ECM connectors.
Turn the key switch to the ON position. Monitor the "Active Diagnostic Code" screen on Cat ET. Wait at least 15 seconds for activation of the code. An open circuit diagnostic code 03 should be active for the suspect sensor.
Fabricate a jumper wire 150 mm (6 inch) long. Crimp a Deutsch Socket to both ends of the wire.
Install the jumper wire at the breakout T. Insert the jumper wire between the terminal for the suspect sensor supply and the common connection for the sensor. A short circuit diagnostic code 04 should be active when the jumper wire is installed.Refer to Illustration 3 for the breakout T.Expected Result:An open circuit diagnostic code 03 is active when the jumper wire is removed. A short circuit diagnostic code 04 is active when the jumper wire is installed.Results:
OK - The ECM is operating properly. There may be an intermittent problem in the wiring between the ECM and the suspect sensor. Proceed to Test Step 8.
Not OK - One of the following conditions exists: The open circuit diagnostic code 03 is not active when the harness is disconnected. The short circuit diagnostic code 04 is not active when the jumper wire is installed.Repair: Perform the following repair:
Temporarily connect a test ECM.
Remove all jumpers and replace all connectors.
Recheck the system for active diagnostic codes.
Repeat the Test Step.
If the problem is resolved with the test ECM, reconnect the suspect ECM.
If the problem returns with the suspect ECM, replace the ECM.
Verify that