COLLAR AS-BOTTOM 9R2955 - Caterpillar

Illustration 1 g02677141
Schematic of the rear axle oil temperature sender
Table 1
SENDER TEMERATURE RANGE     TEMP     OHMS    
HIGH    
150° C (302° F)     18    
MID POINT    
95° C (203° F)     80    
LOW    
−40° C (−40° F)     34000    Note: Results will vary due to sender temperatureThis diagnostic code is recorded when the ECM reads the signal voltage of the temperature sender and the voltage is too low. The possible causes of this failure are listed here:
The sender has failed.
The signal circuit in the machine harness is shorted to ground.
The ECM has failed. The ECM failing is unlikely. Test Step 1. CHECK THE SENDER.
Disconnect the machine harness from the sender. Expected Result:The diagnostic code changes from CID 0428 FMI 04 to CID 0428 FMI 03.Results:
OK - The diagnostic code changed from CID 0428 FMI 04 to CID 0428 FMI 03. This indicates that the failure is no longer present. The sender has failed. Repair: Replace the sender.STOP
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 machine harness connector from the ECM.
At the machine harness connector for the sender, measure the resistance between the signal contact 1 (wire J854-YL) 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 has failed. Repair: It is unlikely that the ECM has failed. Exit this procedure, and perform this procedure again. If the failure is not found, replace the ECM. See Testing and Adjusting, " 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 harness. STOP