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| Illustration 1 | g02153076 |
Schematic of the "Hoist Lower" solenoid | |
This diagnostic code is associated with the "Hoist Lower" solenoid. The FMI 05 diagnostic code means that the ECM has determined that an open in the circuit exists.
The 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 Chassis ECM has failed. A failure of the ECM 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 0725 FMI 05 is active before performing this procedure.
Note: Use a Digital Multimeter for the measurements in this procedure.
Test Step 1. CHECK THE SOLENOID.
- Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
- Disconnect the solenoid with the active diagnostic code from the machine harness.
- At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire G705-GN) to contact 2 (wire H803-BU).
- Observe the status of the CID 0725 FMI 05 diagnostic code.
Expected Result:
The diagnostic code is active. Then, the diagnostic code changes from an FMI 05 to an FMI 06 diagnostic code as the jumper wire is installed.
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- NO - The diagnostic is no longer active.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. Replace the solenoid. Verify that the new solenoid corrects the problem.
STOP
Test 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 connectors from the Chassis 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 J1-66 (wire G705-GN) to contact J1-55 (wire H803-BU).
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: Repair the machine harness or replace the machine harness.
STOP
Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
- Inspect the harness connectors. Clean the contacts of the harness connectors. Check the wires for damage to the insulation that is 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 circuit.
- Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe that the clips for each connector are fastened securely.
- Turn the disconnect switch and the key start switch to the ON position.
- Operate the machine.
- Check the status of the CID 0725 FMI 05 diagnostic code.
Expected Result:
The CID 0725 FMI 05 diagnostic code is active.
Results:
- YES - The CID 0725 FMI 05 diagnostic code is active. The diagnostic code has not been corrected.
Repair: Check the circuit again. Use the Cat ET service tool in order to perform a "Wiggle Test" on the machine wiring harness. The "Wiggle Test" can detect shorts and opens in the machine wiring harness that are momentary or intermittent. A failure of the ECM is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - The CID 0725 FMI 05 diagnostic code is not active. The diagnostic code does not exist at this time.
Repair: The initial diagnostic code was probably caused by a poor electrical connection at one of the harness connectors. Resume normal machine operation.
STOP