Illustration 1 | g02831837 |
Schematic of the transmission control |
This diagnostic code is associated with the transmission direction control switch. The transmission direction control switch is connected to three inputs of the Power Train Electronic Control Module (ECM). Two contacts are open and the other contact is grounded during proper operation.
FMI 03 means that the ECM has determined that all three contacts are open.
Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0623 FMI 03 is active before performing this procedure.
Test Step 1. CHECK THE GROUND CIRCUIT OF THE SWITCH IN THE HARNESS
- Move the key start switch and the disconnect switch to the OFF position.
- Disconnect the machine harness connectors from the ECM.
- Measure the resistance between frame ground (wire 202-BK) of the machine harness and contact 2 (wire 202-BK).
Expected Result:
The resistance is less than 5 ohms.
Results:
- YES - The resistance is less than 5 ohms. The circuit is correct. Proceed to Test Step 2.
- NO - The resistance is greater than 5 ohms. The circuit is open. The machine harness has failed.
Repair: Repair the machine harness or replace the machine harness.
STOP
Test Step 2. CHECK THE SWITCH CIRCUITS FOR A SHORT TO THE +BATTERY CIRCUIT
- The machine harness connectors remain disconnected from the ECM.
- The disconnect switch and key start switch remain in the OFF position.
- Disconnect the machine harness from the switch.
- At the machine harness connector for the ECM, measure the resistance from contact J2-49 (wire G750-BU), contact J2-23 (wire G763-PU), and contact J2-28 (wire G755-GY) to all the contacts that are used in the machine harness connectors for the ECM.
Expected Result:
Each resistance measurement is greater than 5 ohms.
Results:
- YES - Each resistance measurement is greater than 5 ohms. The harness is correct. Proceed to Test Step 3.
- NO - One or more of the measurements are less than 5 ohms. There is a short in the machine harness.
Repair: The short is between wire G750-BU and the circuit with the lowest resistance measurement, wire G763-PU and the circuit with the lowest resistance measurement, or the short is between wire G755-GY and the circuit with the lowest resistance measurement. Repair the machine harness or replace the machine harness.
STOP
Test Step 3. CHECK THE SWITCH CIRCUITS IN THE HARNESS
- The machine harness remains disconnected from the ECM and the switch.
- At the harness connector for the switch, connect a jumper wire between contact 4 (wire D729-GY) and contact 3 (wire D728-BU).
- At the harness connector for the ECM, measure the resistance from contact J2-49 (wire G750-BU) to contact J2-28 (wire G755-GY).
- At the harness connector for the switch, connect a jumper wire between contact 3 (wire D728-BU) and contact 1 (wire D734-PU).
- At the harness connector for the ECM, measure the resistance from contact J2-23 (wire G763-PU) to contact J2-49 (wire G750-BU).
Expected Result:
The resistance is less than 5 ohms.
Results:
- YES - The resistance is less than 5 ohms. Proceed to Test Step 4.
- NO - The resistance is greater than 5 ohms. The circuit is open.
Repair: The machine harness has failed. Repair the machine harness or replace the machine harness.
STOP
Test Step 4. CHECK THE OPERATION OF THE SWITCH (NEUTRAL POSITION)
- Remove the jumper wires that were installed in the previous Test Step.
- The machine harness remains disconnected from the ECM and the switch.
- Move the switch to the NEUTRAL position.
- Measure the resistance between contact 2 (wire 202-BK) and contact 1 (wire D734-PU) of the harness connector for the switch.
- Measure the resistance between contact 2 (wire 202-BK) and contact 3 (wire D728-BU) of the harness connector for the switch.
- Measure the resistance between contact 2 (wire 202-BK) and contact 4 (wire D729-GY) of the harness connector for the switch.
Expected Result:
The resistance from contact 1 to contact 2 is less than 5 ohms. The resistance from contact 2 to contacts 3 and 4 is greater than 5 ohms.
Results:
- YES - The resistance from contact 1 to contact 2 is less than 5 ohms. The resistance from contact 2 to contacts 3 and 4 is greater than 5 ohms. The switch is operating correctly in the NEUTRAL position. Proceed to Test Step 5.
- NO - The resistance from contact 1 to contact 2 is not less than 5 ohms. Alternatively, the resistance from contact 2 to contacts 3 and 4 is not greater than 5 ohms. The switch has failed.
Repair: Replace the switch.
STOP
Test Step 5. CHECK THE OPERATION OF THE SWITCH (FORWARD POSITION)
- Move the switch to the FORWARD position.
- Measure the resistance between contact 1 (wire D743-PU) and contact 2 (wire 202-BK) of the harness connector for the switch.
- Measure the resistance between contact 2 (wire 202-BK) and contact 3 (wire D728-BU) of the harness connector for the switch.
- Measure the resistance between contact 2 (wire 202-BK) and contact 4 (wire D729-GY) of the harness connector for the switch.
Expected Result:
The resistance from contact 2 to contact 3 is less than 5 ohms. The resistance from contact 2 to contacts 1 and 4 is greater than 5 ohms.
Results:
- YES - The resistance from contact 2 to contact 3 is less than 5 ohms. The resistance from contact 2 to contacts 1 and 4 is greater than 5 ohms. The switch is operating correctly in the FORWARD position. Proceed to Test Step 6.
- NO - The resistance from contact 2 to contact 3 is not less than 5 ohms. Alternatively, the resistance from contact 2 to contacts 1 and 4 is not greater than 5 ohms. The switch has failed.
Repair: Replace the switch.
STOP
Test Step 6. CHECK THE OPERATION OF THE SWITCH (REVERSE POSITION)
- Move the switch to the REVERSE position.
- Measure the resistance between contact 2 (wire 202-BK) and contact 1 (wire D743-PU) of the harness connector for the switch.
- Measure the resistance between contact 2 (wire 202-BK) and contact 3 (wire D728-BU) of the harness connector for the switch.
- Measure the resistance between contact 2 (wire 202-BK) and contact 4 (wire D729-GY) of the harness connector for the switch.
Expected Result:
The resistance from contact 2 to contact 4 is less than 5 ohms. The resistance from contact 2 to contacts 1 and 3 is greater than 5 ohms.
Results:
- YES - The resistance from contact 2 to contact 4 is less than 5 ohms. The resistance from contact 2 to contacts 1 and 3 is greater than 5 ohms. The switch is operating correctly in the REVERSE position. Proceed to Test Step 7.
- NO - The resistance from contact 2 to contact 4 is not less than 5 ohms. Alternatively, the resistance from contact 2 to contacts 1 and 3 is not greater than 5 ohms. The switch has failed.
Repair: Replace the switch.
STOP
Test Step 7. CHECK IF THE DIAGNOSTIC CODE REMAINS
- Inspect the contacts of the harness connectors and clean the harness connectors.
- Reconnect all the harness connectors.
- Move the disconnect switch and key start switch to the ON position.
- Operate the machine.
- Check the status of CID 0623 FMI 03.
Expected Result:
CID 0623 FMI 03 is active.
Results:
- YES - CID 0623 FMI 03 is active. The diagnostic code has not been corrected. The ECM may have failed.
Repair: The ECM is unlikely to have failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Refer to Troubleshooting, Testing, and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - The CID 0623 FMI 03 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
- A short at one of the harness connectors that was disconnected and reconnected
STOP
- A poor electrical connection