The diagnostic code is associated with the switches for the seat and the armrest. The FMI 04 means that the ECM determined that the voltage is below normal. Both circuits are possibly shorted to ground.
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| Illustration 1 | g00778771 |
Schematic for the switch circuit (armrest and seat) | |
Test Step 1. CHECK FOR AN ACTIVE DIAGNOSTIC CODE WITH ARMREST IN THE UP POSITION
- Do not occupy the seat.
- Place the armrest in the UP position.
- Turn the key start switch to the ON position.
Expected Result:
An active diagnostic code of CID 1190 FMI 04 should not be displayed on the Caterpillar ET and the armrest indicator should be on.
Results:
- OK - An active diagnostic code of CID 1190 FMI 04 is not displayed on the Caterpillar ET and the armrest indicator is on. Proceed to Test Step 5.
- NOT OK - An active diagnostic code of CID 1190 FMI 04 is displayed on the Caterpillar ET and the armrest indicator is flashing. Proceed to Test Step 3.
- NOT OK - An active diagnostic code of CID 1190 FMI 04 is displayed on the Caterpillar ET and the armrest indicator is on. Proceed to Test Step 2.
Test Step 2. CHECK THE CIRCUIT FOR A SHORT TO GROUND
- Turn the key start switch to the OFF position.
- Remove the floorplate in order to get to the ECM.
- Remove the wire harness from the ECM.
- Measure the resistance from contact 3 to contact 58 of the wire harness connector.
Expected Result:
The resistance should be greater than 5000 Ohms.
Results:
- OK - The resistance is greater than 5000 Ohms.
Repair: The ECM is very unlikely to have failed. Reconnect all connections and visually inspect the wire harness. Verify that the values that are present on the machine configuration screen match the machine's options. Verify that the values that are present on the machine configuration screen are installed correctly. Verify that the diagnostic code still exists. If the diagnostic code still exists perform the test steps again.Replace the ECM, if the cause of the diagnostic code was not found after the second attempt. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
Stop.
- NOT OK - The resistance is less than 5000 Ohms.
Repair: The wire harness is damaged between the interlock ECM and the auxiliary hydraulic ECM.
Stop.
Test Step 3. CHECK THE CIRCUIT FOR A SHORT TO GROUND
- Turn the key start switch to the OFF position.
- Remove the floorplate in order to get to the ECM.
- Remove the wire harness from the ECM.
- Measure the resistance from contact 3 to contact 58 of the wire harness connector.
Expected Result:
The resistance should be greater than 5000 Ohms.
Results:
- OK - The resistance is greater than 5000 Ohms.
Repair: The ECM is very unlikely to have failed. Reconnect all connections and visually inspect the wire harness. Verify that the values that are present on the machine configuration screen match the machine's options. Verify that the values that are present on the machine configuration screen are installed correctly. Verify that the diagnostic code still exists. If the diagnostic code still exists perform the test steps again.Replace the ECM, if the cause of the diagnostic code was not found after the second attempt. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
Stop.
- NOT OK - The resistance is less than 5000 Ohms. Proceed to Test Step 4.
Test Step 4. CHECK THE CIRCUIT WHILE THE INTERLOCK ECM IS DISCONNECTED
- Raise the cab. See Operation and Maintenance Manual, "Cab Tilting".
- Locate the Interlock ECM. The interlock ECM is located on the back side of the cab. The cab must be in the RAISED position in order to get to the ECM.
- Disconnect the wire harness from the ECM.
- Measure the resistance from contact 3 to contact 58 of the wire harness for the auxiliary hydraulic ECM.
Expected Result:
The resistance should be greater than 5000 Ohms.
Results:
- OK - The resistance is greater than 5000 Ohms.
Repair: The ECM is very unlikely to have failed. Reconnect all connections and visually inspect the wire harness. Verify that the values that are present on the machine configuration screen match the machine's options. Verify that the values that are present on the machine configuration screen are installed correctly. Verify that the diagnostic code still exists. If the diagnostic code still exists perform the test steps again.Replace the ECM, if the cause of the diagnostic code was not found after the second attempt. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
Stop.
- NOT OK - The resistance is less than 5000 Ohms.
Repair: The circuit is shorted to ground in the wire harness. Locate the short. Repair the wire harness or replace the wire harness.
Stop.
Test Step 5. CHECK FOR AN ACTIVE DIAGNOSTIC CODE WITH THE ARMREST IN THE UP POSITION AND WITH OCCUPYING THE SEAT
- Occupy the seat.
- Leave the armrest in the UP position.
Expected Result:
An active diagnostic code of CID 1190 FMI 04 should not be displayed on the Caterpillar ET .
Results:
- OK - An active diagnostic code of CID 1190 FMI 04 is not displayed on the Caterpillar ET. Proceed to Test Step 7.
- NOT OK - An active diagnostic code of CID 1190 FMI 04 is displayed on the Caterpillar ET. Proceed to Test Step 6.
Test Step 6. CHECK THE ARMREST SWITCH
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| Illustration 2 | g00779041 |
Location of the connector for the armrest switch | |
- Turn the key start switch to the OFF position.
- Disconnect the connector for the armrest switch.
- Measure the resistance from contact 1 to contact 3 of the switch connector.
Expected Result:
The resistance should be greater than 5000 Ohms.
Results:
- OK - The resistance is greater than 5000 Ohms.
Repair: Wire G983-GN is shorted to ground in the wire harness. Locate the short. Repair the wire harness or replace the wire harness.
Stop.
- NOT OK - The resistance is less than 5000 Ohms.
Repair: The armrest switch has failed. Replace the switch.
Stop.
Test Step 7. CHECK FOR AN ACTIVE DIAGNOSTIC CODE WITH THE ARMREST IN THE DOWN POSITION AND WITH OCCUPYING THE SEAT
- Occupy the seat.
- Place the armrest in the DOWN position.
Expected Result:
An active diagnostic code of CID 1190 FMI 04 should not be displayed on the Caterpillar ET and the armrest indicator should be off.
Results:
- OK - An active diagnostic code of CID 1190 FMI 04 is not displayed on the Caterpillar ET and the armrest indicator is off.
Repair: There is no problem at this time.
Stop.
- NOT OK - An active diagnostic code of CID 1190 FMI 04 is displayed on the Caterpillar ET and the armrest indicator is flashing. Proceed to Test Step 8.
- NOT OK - An active diagnostic code of CID 1190 FMI 04 is displayed on the Caterpillar ET and the armrest indicator is on. Proceed to Test Step 9.
Test Step 8. CHECK THE ARMREST SWITCH
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| Illustration 3 | g00779041 |
Location of the connector for the armrest switch | |
- Turn the key start switch to the OFF position.
- Leave the armrest in the DOWN position.
- Disconnect the connector for the armrest switch.
- Measure the resistance from contact 1 to contact 2 of the switch connector.
Expected Result:
The resistance should be greater than 5000 Ohms.
Results:
- OK - The resistance is greater than 5000 Ohms.
Repair: Wire G984-PK is shorted to ground in the wire harness. Locate the short. Repair the wire harness or replace the wire harness.
Stop.
- NOT OK - The resistance is less than 5000 Ohms.
Repair: The armrest switch has failed. Replace the switch.
Stop.
Test Step 9. CHECK THE CIRCUIT FOR A SHORT TO GROUND
- Turn the key start switch to the OFF position.
- Remove the floorplate in order to get to the ECM.
- Remove the wire harness from the ECM.
- Measure the resistance from contact 3 to contact 47 of the wire harness connector.
Expected Result:
The resistance should be greater than 5000 Ohms.
Results:
- OK - The resistance is greater than 5000 Ohms.
Repair: The ECM is very unlikely to have failed. Reconnect all connections and visually inspect the wire harness. Verify that the values that are present on the machine configuration screen match the machine's options. Verify that the values that are present on the machine configuration screen are installed correctly. Verify that the diagnostic code still exists. If the diagnostic code still exists perform the test steps again.Replace the ECM, if the cause of the diagnostic code was not found after the second attempt. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
Stop.
- NOT OK - The resistance is less than 5000 Ohms.
Repair: The wire harness is damaged between the interlock ECM and the auxiliary hydraulic ECM.
Stop.