SCREW-STOP 1197060 - Caterpillar

Illustration 1 g02799148
Schematic of the "T/C Oil Temperature" senderThis diagnostic code is recorded when the ECM reads the signal voltage of the "torque converter oil temperature" sender and the voltage is too low. This diagnostic code is recorded when the ECM reads the signal voltage of the "Transmission Sump Temperature" sender and the voltage is too low. The operating range for the output voltage of the sensor is approximately 0 DCV to 5.0 DCV.The possible causes of this diagnostic code are listed here:
The sender has failed.
The signal circuit in the machine harness is shorted to ground.
The ECM has failed. ECM failure is unlikely.Test Step 1. CHECK THE SENDER.
Disconnect the machine harness from the sender. Expected Result:The diagnostic code changes from a CID 0826 FMI 04 diagnostic code to a CID 0826 FMI 03 diagnostic code.Results:
OK - The diagnostic code changed from a CID 0826 FMI 04 diagnostic code to a CID 0826 FMI 03 diagnostic code. The code indicates that the failure is no longer present. The sender has failed. Repair: Replace the senderSTOP
NOT OK - The diagnostic code remains. The failure remains present. The sender is not causing the failure. Proceed to test step 2.Test Step 2. CHECK THE HARNESS.
The sender remains disconnected from the machine harness.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the J1 machine harness connector from the ECM.
At the machine harness connector for the sender, measure the resistance between the signal contact 1 and frame ground. Expected Result:The resistance is greater than 5000 ohms. Results:
OK - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. The ECM may have failed. Repair: ECM failure is unlikely. Exit this procedure, and perform this procedure again. If the failure is not found, replace the ECM. See Troubleshooting, "Electronic Control Module (ECM) - Replace". STOP
NOT OK - The resistance is less than 5000 ohms. The machine harness has failed. There is a short between frame ground and the signal circuit in the machine harness. Repair: Repair the machine harness or replace the machine harnessSTOP