PULLER A. 8B7545 - Caterpillar

Illustration 1 g02028034
Schematic of the "Auxiliary Circuit Flow Combining" Solenoids
This diagnostic code is associated with the auxiliary circuit for the solenoid valves (flow combining). The FMI 05 diagnostic code means that the Machine ECM has determined that the current of the solenoids is below normal. The possible causes of this diagnostic code are listed below:
The energize circuit of the solenoids is open.
The ground circuit of the solenoids is open.
One or both solenoids has failed.
The Machine ECM has failed. This is unlikely. 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 1931 FMI 05 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.Test Step 1. CHECK THE SOLENOIDS.
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Disconnect the solenoids with the active diagnostic code from the machine harness.
At the machine harness connector for one of the solenoids, place a jumper wire from contact 1 (wire K871-WH(White)) to contact 2 (wire 235-BK(Black)).
Observe the status of the CID 1931 FMI 05 diagnostic code. Expected Result:The CID 1931 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NO - The diagnostic is no longer active. One or both solenoids have failed.Repair: A solenoid has failed. Repeat this Test Step "CHECK THE SOLENOIDS" in order to verify the solenoid failure. Replace the failed 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(s) from the Machine ECM.
The jumper wire that was installed in the previous Test Step remains in place.
At the machine harness connector, measure the resistance from signal contact J2-10 (wire K871-WH(White)) to ground (wire 235-BK(Black)). Expected Result:The resistance is less than 5.0 ohms.Results:
OK - The resistance is less than 5.0 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.Repair: The open is in wire K871-WH(White) or in wire 235-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 and clean the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the CID 1931 FMI 05 diagnostic code. Expected Result:The CID 1931 FMI 05 diagnostic code is active. Results:
YES - The CID 1931 FMI 05 diagnostic code is active. The diagnostic code has not been corrected. The Machine ECM may have failed.Repair: It is unlikely that the Machine ECM has failed. Exit this