VALVE AS-PRESSURE REDUCING 1958697 - Caterpillar

Illustration 1 g01186728
Schematic Of The "Travel Alarm" relay
This diagnostic code is associated with the "Travel Alarm" relay.This diagnostic code is recorded when the Machine ECM reads the voltage of the circuit for the relay as above normal.The possible causes of this diagnostic code are listed below:
The harness is shorted.
The Machine ECM has failed. This is unlikely.Test Step 1. CHECK THE SIGNAL CIRCUIT FOR A SHORT
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the relay.
Disconnect the machine harness connectors C1 and C2 from the Machine ECM.
At machine harness connector C2, measure the resistance from the signal contact C2-15 (wire 331-OR(Orange)) to all other C1 and C2 connector contacts. Expected Result:Each resistance should be greater than 5000 ohms.Results:
YES - Each resistance is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 2.
NO - There is a short in the machine harness. Repair: The short is between the signal contact C2-15 (wire 331-OR(Orange)) and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the contacts of the harness connectors. Clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Clear all inactive diagnostic codes.
Check if the diagnostic code for the relay is present. Expected Result:The diagnostic code for the relay is no longer present.Results:
YES - The diagnostic code is not present. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.STOP
NO - The diagnostic code has not been corrected.Repair: It is unlikely that the Machine ECM is faulty. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code is active. If the cause of the diagnostic code is not found, replace the ECM. See Testing And Adjusting, "Electronic Control Module (ECM) - Replace".STOP