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| Illustration 1 | g01340486 |
Schematic of the Auxiliary Lever #1 Position Sensor | |
This diagnostic code is associated with the Auxiliary Lever #1 Position Sensor. The FMI 08 diagnostic means that the ECM has determined that the signal frequency or the signal pulse width is not within the expected range.
The sensor is a PWM sensor that operates at a frequency of approximately 500 hertz. The sensor has an operating duty cycle of 5% to 95%.
The possible causes of this diagnostic code are listed below:
- The sensor has failed.
- Intermittent connections or poor connections
- Mechanical devices are loose.
- The ECM has failed. This 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 connections in the circuit are clean, secure and in good condition. 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 the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 2204 FMI 08 is active before performing this procedure.
Note: Use a Digital Multimeter for the measurements in this procedure.
System Response:
A level 1 warning will be generated. The feature is disabled.
Test Step 1. CHECK FOR POWER AT THE SENSOR.
- Do not disconnect the harness connector from the sensor.
- At the back of the harness connector for the sensor, insert a 7X-1710 Multimeter Probe along contact 1 (wire 709-OR) for the voltage supply.
- At the back of the harness connector for the sensor, insert a 7X-1710 Multimeter Probe along contact 2 (wire J764-BR) for the ground.
- Turn the key start switch and the disconnect switch to the ON position.
- Measure the voltage from contact 1 (wire 709-OR) to contact 2 (wire J764-BR).
Expected Result:
The voltage is 10 ± 0.5 DCV.
Results:
- OK - The voltage is 10 ± 0.5 DCV. Proceed to Test Step 3.
- NOT OK - The voltage is not 10 ± 0.5 DCV. The circuit is open.
Repair: Repair the machine harness or replace the machine harness.
STOP
Test Step 2. CHECK THE SIGNAL CIRCUIT OF THE SENSOR.
- Turn the key start switch and the disconnect switch to the OFF position.
- At the back of the harness connector for the sensor, remove the 7X-1710 Multimeter Probe from contact 1 and insert the probe along the signal wire contact 3 (wire J948-PK).
- The other 7X-1710 Multimeter Probe remains at the ground wire contact 2 (wire J764-BR).
- Turn the disconnect switch and the key start switch to the ON position.
- Monitor the signal of the sensor with the multimeter.
- Without disconnecting the sensor or the hardware that is associated with the sensor from the machine, take the sensor through the full operating range of the sensor.
Expected Result:
The sensor's signal responds in the manner that is described at the beginning of this procedure.
Results:
- OK - The sensor's signal responds correctly. The sensor is operating correctly. Proceed to Test Step 3.
- NOT OK - The sensor's signal does not respond correctly. The sensor has failed.
Repair: Replace the joystick handle. Recalibrate if necessary. Refer to Testing and Adjusting, KENR 5148, "Calibration" procedure. Verify that the new joystick handle corrects the problem.
STOP
Test Step 3. CHECK THE SIGNAL CIRCUIT AT THE ECM.
- Turn the key start switch and the disconnect switch to the OFF position.
- Insert the 7X-1710 Multimeter Probes into the back of the ECM connector along J2-49 (wire J948-PK) and J1-56 (wire J764-BR).
- Turn the disconnect switch and the key start switch to the ON position.
- Monitor the signal of the sensor with the multimeter.
- Without disconnecting the sensor or the hardware that is associated with the sensor from the machine, take the sensor through the full operating range of the sensor.
Expected Result:
The sensor's signal responds in the manner that is described at the beginning of this procedure.
Results:
- OK - The sensor's signal responds correctly. The sensor is operating correctly. Proceed to Test Step 4.
- NOT OK - The sensor's signal does not respond correctly. The harness has failed.
Repair: Repair the machine harness or replace the machine harness.
STOP
Test Step 4. CHECK THE SIGNAL CIRCUIT FOR A SHORT IN THE HARNESS.
- The key start switch and the disconnect switch remain in the OFF position.
- Disconnect the machine harness connectors from the sensor and the ECM.
- Measure the resistance between contact J2-49 (wire J948-PK) and all contacts that are used in the machine harness connectors for the ECM.
Expected Result:
The resistance is greater than 5000 ohms.
Results:
- OK - The resistance is greater than 5000 ohms. The circuit is correct. Proceed to Test Step 5.
- NOT OK - The resistance is less than 5 ohms. The signal circuit is shorted to another circuit in the harness.
Repair: There is a short in the machine harness. The short is in the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.
STOP
Test Step 5. CHECK IF THE DIAGNOSTIC CODE REMAINS
- Inspect the harness connectors and clean the contacts of the machine harness connectors.
- Reconnect all harness connectors.
- Turn the disconnect switch and the key start switch to the ON position.
- Operate the machine.
- Check the status of the CID 2204 FMI 08.
Expected Result:
The CID 2204 FMI 08 is not active.
Results:
- OK - The CID 2204 FMI 08 is not active. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor connection or a short at one of the connectors that was disconnected and reconnected. Resume normal operation.STOP
- NOT OK - The CID 2204 FMI 08 is active. The diagnostic code has not been corrected.
Repair: It is unlikely that the ECM has failed. Exit the procedure and perform this procedure again. If the cause of the problem is not found, contact the Technical Communicator for your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, see Troubleshooting, "Electronic Control Module (ECM) - Replace".
STOP