Conditions Which Generate This Code:
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| Illustration 1 | g02625575 |
Schematic of Torque Converter Lockup Clutch | |
The CID 0679 FMI 03 diagnostic code is associated with the Lockup Clutch Solenoid. The code FMI 03 means that the Transmission/Chassis ECM has determined that the voltage is above normal.
The coil resistance for this solenoid is 8.7 ± 0.4 ohms at 25°C.
The possible causes of the diagnostic code are listed below:
- The solenoid energizer circuit of the modulating valve is shorted to another voltage source.
- The ECM has failed. The failure of the ECM is unlikely.
Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all of the connections in the circuit are clean and secure. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.
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 0679 FMI 03 is active before performing this procedure.
System Response:
When this diagnostic code is active, the ECM will turn off the current to the solenoid.
Test Step 1. CHECK THE SOLENOID CIRCUIT FOR A SHORT CIRCUIT
- Turn the key start switch and the battery disconnect switch to the OFF position.
- Disconnect the machine harness connectors from the solenoid and the ECM.
- At the harness connector for the Transmission/Chassis ECM, measure the resistance from contact J1-48 wire 705-PK to all the other contacts that are used in the machine harness connectors J1 and J2 for the ECM.
Expected Result:
Each individual resistance measurement should be greater than 5000 Ohms.
Results:
- OK - Each resistance measurement is greater than 5000 ohms. The measurements are indicating that the circuit is not shorted to another circuit in the machine harness. Proceed to Test Step 2.
- NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between contact J1-48 (wire 705-PK) and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.STOP
Test Step 2. CHECK THE OPERATION OF THE ECM
The disconnect switch and the key start switch remain in the OFF position. The machine harness connectors for the solenoid and the ECM remain disconnected.
- At the J1 connector for the ECM, use a wire removal tool to remove wire 705-PK from contact J1-48.
- Reconnect the machine harness J1 and J2 connectors to the ECM.
- Turn the disconnect switch and the key start switch to the ON position.
- Observe the status of the active diagnostic code.
Expected Result:
The active CID 0679, FMI 03 diagnostic code changes to a CID0679, FMI 05 diagnostic code after the wire is disconnected.
Results:
- YES - The FMI 03 changes to FMI 05 after the wire is disconnected. The ECM has responded correctly to the open circuit condition. Reinstall the disconnected wire into the correct space in the ECM connector before proceeding to the next Test Step. Proceed to Test Step 3.
- NO - The FMI 03 diagnostic code remains active. The status of the active diagnostic code did not change when the wire was disconnected from the ECM.
Repair: The ECM has not responded correctly to the condition of an open circuit. The operation of the ECM is not correct. Prior to replacing an ECM, contact your Technical Communicator for possible consultation with AVSpare. If the ECM requires replacement, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
Test Step 3. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE
- 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, corrosion, 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 in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are fastened.
- Turn the disconnect switch and the key start switch to the ON position.
- Operate the machine.
- Determine if the diagnostic code is active.
Expected Result:
The diagnostic code is active.
Results:
- YES - The diagnostic code is still active. The problem has not been corrected.
Repair: If all of the possible cause of this problem have been investigated and a problem has not been found, ensure that the latest software is loaded on the ECM. If the diagnostic code remains active, the ECM could be causing the problem. If the ECM requires replacement, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - The diagnostic code is not active. The problem does not exist at this time. The initial diagnostic code was probably caused by a poor connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.STOP