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| Illustration 1 | g00743059 |
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Schematic of the transmission output speed sensor (No.2) | |
This diagnostic code is associated with the transmission output speed sensor (No.2). This diagnostic code is recorded when the Power Train/Chassis Electronic Control Module (ECM) receives an incorrect transmission output signal from the sensor. The signal is below the required level accepted by the ECM. The engine must be running. The incorrect signal that is being read by the ECM has the following characteristics: erratic, intermittent and incorrect. The ECM determines that this condition exists by comparing signal information. The ECM compares the two signals from the sensors. The ECM checks if one of the two signals is invalid or out of range.
One of the following conditions must be present before the diagnostic code will be active:
- The signal from the transmission output speed sensor (No.2) to the ECM is incorrect.
- The ECM is not receiving the correct information about the transmission output speed sensor (No.2) over the CAT Data Link.
Note: Check for other related diagnostic codes before performing the following diagnostic code procedure. Check for an active CID 0248 FMI 09. Correct the related CID 0248 FMI 09 first. Then view the status of the other diagnostic codes and correct the other active codes.
The FMI 02 means that the ECM has determined that the signal from the sensor is erratic, intermittent, or incorrect.
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 0673 FMI 02 is active before performing this procedure.
System Response:
The ECM is not receiving the correct information about the transmission output speed sensor (No.2). If the transmission output speed sensor (No.1) and the engine speed sensor are working properly, this diagnostic code will have no effect on the machine response.
Note: The machine must be moving in order for the ECM to see a signal on the input pin. When the ECM determines that a signal exists, the diagnostic code is not active.
Test Step 1. CHECK THE ADJUSTMENT OF THE SENSOR
- Check the sensor adjustment, refer to Systems Operation, Troubleshooting, Testing and Adjusting, "Speed Sensor (Transmission Output) - Replace".
Expected Result:
The sensor is adjusted correctly.
Results:
- OK - The sensor adjustment is correct. Proceed to Test Step 2.
- NOT OK - The sensor is not adjusted correctly.
Repair: Adjust the sensor to the required specification.
STOP
Test Step 2. CHECK THE SENSOR RESISTANCE.
- Turn the key start switch and the battery disconnect switch to the OFF position.
- Disconnect the machine harness from the sensor.
- At the connector for the sensor, measure the resistance between the two contacts of the connector of the sensor.
Expected Result:
The resistance measurement is between 1000 ohms and 1200 ohms.
Results:
- OK - The sensor is not faulty. Proceed to Test Step 3.
- NOT OK - The sensor is failed.
Repair: Replace the sensor. Adjust the sensor properly during the installation. See Systems Operation, Troubleshooting, Testing and Adjusting, "Speed Sensor (Transmission Output) - Replace".
STOP
Test Step 3. CHECK THE RETURN CIRCUIT.
- The machine harness remains disconnected from the sensor.
- The battery disconnect switch and the key start switch remain in the OFF position.
- At the machine harness connector for the sensor, measure the resistance between contact 2 (wire E901-WH(White)) and frame ground.
Expected Result:
The resistance should measure 5 ohms or less.
Results:
- OK - The return circuit is correct. Proceed to Test Step 4.
- NOT OK - The return circuit (wire E901-WH(White)) in the machine harness has high resistance (open circuit).
Repair: Repair the machine harness or replace the machine harness.
STOP
Test Step 4. CHECK THE SIGNAL CIRCUIT FOR AN OPEN IN THE MACHINE HARNESS.
- Place a jumper between the two contacts of the machine harness connector for the sensor.
- Disconnect connectors J1 and J2 from the machine harness of the ECM .
- Measure the resistance from the signal J2-14 (wire E900-WH(White)) to the return contact J2-20 (wire E901-WH(White)) of the machine harness.
Expected Result:
There should be continuity less than 5 ohms resistance.
Results:
- OK - The signal circuit in the machine harness is correct. Proceed to Test Step 5.
- NOT OK - There is an open in the signal circuit of the machine harness.
Repair: Repair the machine harness or replace the machine harness.
STOP
Test Step 5. CHECK THE SIGNAL FOR A SHORT.
- Remove the jumper used in the previous Test Step.
- Reconnect the machine harness to the sensor.
- At the J1 and J2 harness connectors, measure the resistance between J2-14 (wire E901-WH(White)) and all sources of +battery and frame ground.
Expected Result:
Each resistance should be greater than 5 ohms.
Results:
- OK - The resistance is greater than 5 ohms. The machine harness is correct. Proceed to Test Step 6.
- NOT OK - The resistance is less than 5 ohms. The machine harness is faulty.
Repair: The short is between the signal circuit (wire E901-WH(White)) and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.
STOP
Test Step 6. 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 0673 FMI 02.
Expected Result:
The CID 0673 FMI 02 is active.
Results:
- YES - The CID 0673 FMI 02 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 0673 FMI 02 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