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| Illustration 1 | g00935979 |
Schematic of the Brake Charging solenoid | |
This diagnostic code is associated with the Brake Charging solenoid. An FMI 04 means the machine ECM has determined the voltage of the Brake Charging solenoid circuit is above normal.
Possible causes for this diagnostic code are:
- The energize circuit of the solenoid is shorted to ground.
- The solenoid has failed.
- The ECM may have failed, but 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 1231 FMI 04 is active before performing this procedure.
Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.
System Response:
The diagnostic code of CID 1231 FMI 04 will be logged in the internal memory of the ECM.
When this diagnostic code occurs, the solenoid return for the cooling fan and brake charging is disabled. Both systems go to 'fail safe' mode.
Test Step 1. CHECK THE SOLENOID.
- Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
- Observe the status of the diagnostic code.
- Disconnect the solenoid with the active diagnostic code from the machine harness.
Expected Result:
CID 1231 FMI 04 changes to CID 1231 FMI 05 when the solenoid is disconnected.
Results:
- YES - CID 1231 FMI 04 changes to CID 1231 FMI 05 when the solenoid is disconnected. The circuit is correct.
Repair: The solenoid has failed. Repeat this test "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid.
STOP
- NO - CID 1231 FMI 04 remains active. Proceed to Test Step 2.
Test Step 2. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO GROUND.
- Turn the key start switch and the disconnect switch to the OFF position.
- The solenoid remains disconnected from the machine harness.
- Disconnect the J1 and J2 harness connectors from the ECM.
- At the J1 harness connector, measure the resistance from the signal contact J1-68 (wire C881-BU) to all contacts that are used in both the machine harness connectors for the ECM.
Expected Result:
Each resistance measurement is greater than 5000 ohms.
Results:
- OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
- NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between J1-68 (wire C881-BU) and the circuit with the low resistance measurement.
Repair: Repair the machine harness or replace the machine harness.
STOP
Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
- Inspect the harness connectors and clean the contacts of 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 1231 FMI 04.
Expected Result:
The CID 1231 FMI 04 is active.
Results:
- YES - The CID 1231 FMI 04 is active. The diagnostic code has not been corrected. The ECM may have failed.
Repair: Is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. See Troubleshooting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - The CID 1231 FMI 04 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 that was resolved when a connector was disconnected and reconnected. Resume normal machine operation.
STOP