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| Illustration 1 | g01042837 |
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Schematic of the retarder lever switch | |
This diagnostic code is associated with the retarder lever switch. This diagnostic code is recorded when the Power Train/Chassis Electronic Control Module (ECM) reads the voltage of the switch as being below normal. The voltage of the signal wire is below normal and/or shorted to ground.
The possible causes of this diagnostic code are listed here:
- The switch has failed.
- The signal circuit in the machine harness is shorted to ground.
- The ECM has failed. This is unlikely.
Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 1227 FMI 04 is active before performing this procedure.
Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.
System Response:
The manual retarder does not activate. The switch will operate properly after the diagnostic code has been corrected.
Test Step 1. CHECK THE SENSOR.
- Turn the battery disconnect switch and the key start switch to the ON position.
- Observe the status of the diagnostic code. Then disconnect the machine harness from the switch.
Expected Result:
If the switch is not the cause of the diagnostic code, the diagnostic code remains active. If the switch has failed, the diagnostic code is no longer active.
Results:
- OK - The diagnostic code is active. The switch is not causing the diagnostic code. The machine harness or the ECM may have failed. Proceed to Test Step 2.
- NOT OK - This diagnostic code is no longer active. The machine harness is correct and the ECM is operating properly. The switch has failed.
Repair: Replace the switch.
STOP
Test Step 2. CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND.
- The switch remains disconnected from the machine harness.
- Turn the key start switch and the battery disconnect switch to the OFF position.
- Disconnect the machine harness from the ECM.
- At the machine harness connector for the ECM, measure the resistance between the signal contact and frame ground.
Expected Result:
The resistance is greater than 5 ohms.
Results:
- OK - The resistance is greater than 5 ohms. The harness circuit resistance is correct. Proceed to Test Step 3.
- NOT OK - Resistance is less than 5 ohms. The machine harness has failed.
Repair: There is a short between frame ground and the signal circuit in the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 3. 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 battery disconnect switch and the key start switch to the ON position.
- Operate the machine.
- Check the status of the CID 1227 FMI 04.
Expected Result:
The CID 1227 FMI 04 is active.
Results:
- YES - The CID 1227 FMI 04 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. Refer to Systems operation, Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.
STOP
- NO - The CID 1227 FMI 04 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