Illustration 1 | g01341090 |
Schematic for the Decelerator Enable Switch |
This diagnostic code is associated with the Decelerator Enable Switch. The switch is connected to two inputs of the ECM. One contact is open and the other contact is grounded during proper operation.
This FMI 03 means that the ECM has determined that the normally open contact and the normally closed contact showing system voltage at the same time.
Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 1757 FMI 03 is active before performing this procedure.
Test Step 1. CHECK THE SWITCH CIRCUITS FOR A SHORT TO THE +BATTERY CIRCUIT
- Turn the disconnect switch and the key start switch to the OFF position.
- Disconnect the machine harness connector(s) from the ECM.
- Disconnect the connector for the switch from the machine harness.
- At the machine harness connector for the ECM, measure the resistance from contact J1-21 (wire F774-WH) and contact J1-22 (wire H743-YL) of the machine harness to all the contacts that are used in 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 harness is correct. Proceed to Test Step 2.
- NO - One or more of the measurements were less than 5 ohms. There is a short in the machine harness.
Repair: The short is between wire F774-WH and the circuit with the lowest resistance measurement or the short is between wire H743-YL and the circuit with the lowest resistance measurement. Repair the machine harness or replace the machine harness.
STOP
Test Step 2. 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 F774-WH) and contact 6 (wire H743-YL).
- At the harness connector for the ECM, measure the resistance from contact J1-21 (wire F774-WH) to contact J1-22 (wire H743-YL).
Expected Result:
The resistance is less than 5 ohms.
Results:
- OK - The resistance is less than 5 ohms. Proceed to Test Step 3.
- NOT OK - The resistance is greater than 5000 ohms. The circuit is open.
Repair: The machine harness has failed. Repair the machine harness or replace the machine harness.
STOP
Test Step 3. CHECK THE OPERATION OF THE SWITCH
- Remove the jumper that was installed in the previous Test Step.
- The machine harness remains disconnected from the switch.
- Move the switch to the ON position.
- Connect one lead from a multimeter to contact 5 (wire 202-BK) of the harness connector for the switch.
- Connect the other lead from a multimeter to contact 6 (wire H743-YL) of the harness connector for the switch.
- Measure the resistance between contact 5 (wire 202-BK) and contact 6 (wire H743-YL). Note the resistance.
Expected Result:
The resistance from contact 5 to contact 6 is less than 5 ohms.
Results:
- YES - The resistance from contact 5 to contact 6 is less than 5 ohms. The switch is operating correctly in the ON position. Proceed to Test Step 4.
- NO - The resistance from contact 5 to contact 6 is not less than 5 ohms. The switch has failed.
Repair: Replace the switch.
STOP
Test Step 4. CHECK IF THE DIAGNOSTIC CODE REMAINS
- Inspect the contacts of the harness connectors and clean the harness connectors.
- Reconnect all the harness connectors.
- Turn the disconnect switch and the key start switch to the ON position.
- Operate the machine.
- Check the status of the CID 1757 FMI 03.
Expected Result:
The CID 1757 FMI 03 is active.
Results:
- YES - The CID 1757 FMI 03 is active. The diagnostic code has not been corrected. The ECM may have failed.
Repair: It 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 Testing And Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - The CID 1757 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 or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.
STOP