REGULATOR-WATER TEMPERATURE 1631437 - Caterpillar

Illustration 1 g03803046
Air Conditioner Compressor Clutch solenoid connections
A CID 2671 is associated with the Air Conditioner Compressor Clutch Solenoid. An FMI 03 means that the Machine ECM has determined that the voltage in the solenoid circuit is above normal.The possible causes of this diagnostic code are listed below:
Solenoid failure.
Grounded solenoid circuit.
The relay has failed
Machine ECM failure, but is most unlikely.Note: Poor connections are often the cause of a problem in electrical circuits. Before performing this procedure, inspect all the machine harnesses and connectors involved in the circuit. Make sure to verify that all of the connections in the circuit are clean, secure, and in good condition. Correct any problems found with any of the connections. Verify the diagnostic code CID 2671 FMI 03 is still active, before continuing with this procedure.Note: The following test procedure may create other diagnostic codes. Ignore all the created diagnostic codes now, but clear all those codes after the cause for the original diagnostic code has been corrected.Test Step 1. Check The Energize Circuit Of The Solenoid For A Short
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the machine harness connector from the solenoid. Disconnect the machine harness connectors J1 from the ECM.
At the machine harness connectors for the ECM, measure the resistance from contact J1-31 (wire C510-WH(White)) to all of the other contacts that are used in the J1 connectors for the ECM.
At the AC relay connector, measure the resistance from contact 4 (wire E554-PK(Pink)) to all of the other contacts that are used in the J1 connectors for the ECM and Frame Ground. Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
YES - Each resistance measurement is greater than 5000 ohms. There are no short circuits in the harness. Proceed to Test Step 2.
NO - A resistance measurement is less than 5000 ohms. There is a short circuit in the harness. Repair: The short is from wire C510-WH(White) or wire E554-PK(Pink) to the circuit that has a low resistance.Repair or replace the harness.Proceed to Test Step 2.Test Step 2. Check The Diagnostic Code Status
Reconnect all harness connectors. Make sure all the connectors are clean, and fully seated. Make sure that the clips for each connector are securely fastened.
Turn the disconnect switch, and the key start switch, to the ON position.
Clear all inactive diagnostic codes.
Operate the machine.
Observe the status of the CID 2671 FMI 03 diagnostic code. Expected Result:The diagnostic code is no longer active.Results:
YES - The diagnostic code is no longer active and does not exist at this time. The problem has been corrected.Repair: Return machine to normal operation.STOP
NO - The diagnostic code is still active. The problem has not been corrected.Repair: If you have not inspected the harness connectors in a previous Test Step, do that now.Clean the contacts of the harness connectors. Check the wires for damage to the insulation caused by excessive heat, battery acid, or chafing.Perform a 45 N (10 lb.) pull test on each of the wires that are associated with the