 | |
| Illustration 1 | g02729736 |
Connections of the seat sensor | |
This diagnostic code is associated with the operator presence sensor in the seat. The FMI 04 means that the ECM has determined that the voltage of the circuit is below normal.
The possible causes of this diagnostic code are listed below:
- The signal circuit for the sensor is shorted to ground.
- The sensor has failed.
- The ECM has failed. An ECM failure is unlikely.
| Sensor Status | |||
|---|---|---|---|
| MODE | Resistance | Voltage seen by ECM | |
| Operator present | 90 to 800 ohms | 0.2 to 2.93 VDC | |
| Operator not present | 800 to 4000 ohms | 2.93 to 4.95 VDC | |
Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 2113 - FMI 04 is active before performing this procedure.
Note: Use a digital multimeter for the measurements in this procedure.
Test Step 1. Check the sensor
- Turn the disconnect switch and the key start switch to the ON position.
- Ensure that the diagnostic code is active.
- Observe the status of the diagnostic code. Disconnect the 2-pin connector from the machine harness for the seat.
Expected Result:
The FMI 04 remains active. The code has not changed and the code is still active.
Results:
- YES - The diagnostic code remains active. The sensor is correct. Proceed to Test Step 2.
- NO - The diagnostic code is no longer active. The sensor has failed.
Repair: Replace the sensor.
STOP
Test Step 2. Check the wiring harness of the sensor for a short to ground
The 2-pin connector remains disconnected from the seat.
- Turn the key start switch and the disconnect switch to the OFF position.
- Disconnect the J1 machine harness connector from the ECM.
- At the machine harness connector for the ECM, measure the resistance from the signal contact J1-53 wire (U766-BR) of the machine harness to all contacts of the machine harness connectors for the ECM.
Expected Result:
Each resistance measurement is greater than 5000 ohms.
Results:
- YES - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
- NO - One or more resistance measurements are not correct. There is a short in the machine harness.
Repair: The short is between contact J1-53 wire (U766-BR) and the circuit with the low resistance measurement. Refer to Electrical System Schematic, KENR8916. Examine all of the connectors for possible locations of a short. For information on testing for short circuits and finding short circuits, refer to Troubleshooting, "Wiring Harness (Short Circuit) - Test". Repair the machine harness or replace the machine harness.
STOP
Test Step 3. Check the status of the diagnostic code
- Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation. Damage 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 of the 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 CID 2113 - FMI 04 diagnostic code is active.
Expected Result:
The CID 2113 - FMI 04 diagnostic code is not active.
Results:
- YES - The CID 2113 - FMI 04 diagnostic code is not active. The problem does not exist at this time.
Repair: The initial diagnostic code was probably caused by a poor electrical connection that was disconnected and reconnected. Resume normal machine operation.
STOP
- NO - The CID 2113 - FMI 04 diagnostic code is active.
Repair: An ECM failure is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, the ECM may have failed. Prior to replacing an ECM, always contact your technical communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time. Refer to Troubleshooting, "Electronic Control Module (ECM) - Replace".
STOP