BRACKET 4W5178 - Caterpillar

Illustration 1 g01732015
Schematic of the "Rear Axle Cooling Fan" Solenoid
This diagnostic code is associated with the "Rear Axle Cooling Fan" Solenoid. The FMI 05 diagnostic code means that the Brake ECM has determined that the current for the solenoid is below normal. An open may exist in the circuit for the solenoid. Some possible causes of this diagnostic code are listed below:
The energize circuit of the solenoid is open.
The return circuit of the solenoid is open.
The solenoid has failed.
The ECM has failed. This is unlikely. System Response:When the CID 0796 FMI 05 diagnostic code is active, the machine response can be:
The differential cooling fan will operate at the minimum speed or the fan will not operate.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0796 FMI 05 is active before performing this procedure.Test Step 1. CHECK THE SOLENOID
Disconnect the solenoid from the machine harness.
At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire G736-PK(Pink)) to contact 2 (wire P997-BR(Brown)).
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Observe the status of the CID 0796 FMI 05 diagnostic code. Expected Result:The CID 0796 FMI 05 diagnostic code remains active.Results:
YES - The diagnostic code remains active. The jumper wire does not affect the diagnostic code. Proceed to Test Step 2.
NO - The diagnostic is no longer active. The solenoid has failed.Repair: The solenoid has failed. Repeat this Test Step "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid. Verify that the new solenoid corrects the problem.STOPTest Step 2. CHECK THE HARNESS FOR AN OPEN
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector of the ECM J2 from the Brake ECM.
The jumper wire that was installed in the previous Test Step remains in place.
At the machine harness connector J2 for the ECM, measure the resistance from contact J1-59 (wire G736-PK(Pink)) to contact J2-8 (wire P997-BR(Brown)). Expected Result:The resistance is less than 5 ohms.Results:
OK - The resistance is less than 5 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - The resistance is greater than 5000 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness. A resistance measurement that is much greater than 5 ohms but less than 5000 ohms could indicate that one of the connection points in the circuit is not an open connection but the connection is not good.Repair: The open or a possible bad connection is in wire G736-PK(Pink) or in wire P997-BR(Brown) of the machine harness. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the contacts of the harness connectors that are used in the solenoid circuit. Ensure that the contacts are secure. Clean all of