PRESS GP-PORT 2425360 - Caterpillar

Illustration 1 g01728535
Schematic diagram of the "Engine Cooling Fan" solenoid
This diagnostic code is associated with the "Engine Cooling Fan". The FMI 05 means that the 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 0291 FMI 05 diagnostic code is active, the machine response can be found in the list below:
The engine cooling fan will operate at the minimum speed or the fan will not operate.
The engine coolant temperature may increase.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 0291 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 J816-GN(Green)) to contact 2 (wire J806-BK(Black)).
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Observe the status of the CID 0291 FMI 05 diagnostic code. Expected Result:The CID 0291 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NO - The diagnostic is no longer active.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 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 J1-51 (wire J816-GN(Green)) to contact J1-50 (wire J807-BK(Black)). 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 open an open connection but the connection is not a good connection.Repair: The open or the possible bad connection is in wire J816-GN(Green) or in wire J807-BK(Black) 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