MANIFOLD & VALVE GP 3100122 - Caterpillar

Illustration 1 g01804520
Schematic of the Hydraulic Oil Temperature SenderThis diagnostic code is recorded when the signal voltage of the hydraulic oil temperature sender and the voltage is too low. The Machine ECM records this diagnostic code after the information is received from the monitoring system through the Cat Data Link.The possible causes of this diagnostic code are listed below:
The sender has failed.
The signal circuit in the machine harness is shorted to ground.
The ECM has failed, however a failure of the ECM is unlikely. Note: The Machine ECM is equipped with LED indicators that serve as a self-diagnostic check. With the key start switch ON, the following can be determined by the ECM indicator lights:
If all of the LED lights are Off, voltage is not being supplied to the Machine ECM. Check for power to the ECM.
If the yellow LED is Flashing, a communication error exists on the "CAN" data-link circuit.
If the yellow LED is constantly On, the Machine ECM software may be missing / not loaded.
If the red LED is Flashing, the Machine ECM has failed and may need replacement. The diagnostic code of CID 0600 FMI 04 will be logged in the internal memory of the ECM.Note: Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, that all connections are secure and that all connections are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the problem has been corrected.Test Step 1. CHECK THE SENDER.
Turn the disconnect switch and the key start switch to the ON position.
Disconnect the machine harness from the sender.Expected Result:The diagnostic code CID 0600 FMI 04 is no longer present.Results:
OK - The diagnostic code CID 0600 FMI 04 is no longer present (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 CN-2 machine harness connector from the Monitoring System.
At the machine harness connector for the sender, measure the resistance between the signal contact (wire 491-PK) 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 machine ECM may have failed.Repair: A failure of the Machine ECM is unlikely. Exit this procedure, and perform this procedure again. If the failure is not found, replace the Machine ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP
NOT OK - The resistance is