AIR COMPRESSOR GP 2466719 - Caterpillar

Illustration 1 g00749813
Schematic For The Temperature Sender (Torque Converter Oil)This diagnostic code is recorded when the main display module reads a low sender signal. When this diagnostic code occurs, the gauge indicates an abnormally high value. The following symptoms could cause the diagnostic code:
The sender has failed.
The signal circuit in the machine harness is shorted to ground.
The main display module has failed.Note: The main display module is unable to determine when a sender is open. Also, the main display module is unable to determine when a sender signal harness is open. This condition is recognized when the gauge constantly indicates a value at the far left side of the scale.Service Notes: Ensure that the desired diagnostic code is on hold. Ensure that the diagnostic code indicator shows "SERV CODE". The schematic that is shown above represents a typical installation of the component. Verify the connector contact and wire numbers by using the Electrical System Schematic for the machine that is being serviced. Test Step 1. CHECK THE MAIN DISPLAY MODULE AND THE HARNESS.
Turn the disconnect switch and the key start switch to the ON position.
The diagnostic code indicator should show "SERV CODE".
Disconnect the machine harness from the sender that is causing the diagnostic code.
Observe the diagnostic code indicator.Expected Result:The diagnostic code indicator is ON.Results:
YES - The diagnostic code indicator stays ON. The harness wiring or the main display module has failed. Proceed to test step 2.
NO - The diagnostic code indicator turns OFF. The sender has failed.Repair: Replace the sender. Stop.Test Step 2. CHECK THE SIGNAL WIRE FOR A SHORT TO GROUND.
The disconnect switch and the key start switch remain in the ON position.
At the machine harness for the sender, measure the voltage between the frame ground and the sender signal wire.Expected Result:The voltage that is measured is within one of the following specifications.Results:
6.0 0.5 DCV - The voltage is 6.0 0.5 DCV. The voltage is correct. Verify that the diagnostic code remains.Repair: It is unlikely that the main display module has failed. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code indicator is illuminated for this diagnostic code. If the cause of the diagnostic code is not found, replace the main display module. See Testing and Adjusting, "Module - Replace". Stop.
LESS THAN 0.5 DCV - The voltage is less than 0.5 DCV. The harness wiring has failed. There is an open circuit or a