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| Illustration 1 | g01347702 |
Schematic of the Engine Speed Sensor | |
The CID 0190 FMI 02 diagnostic code is recorded when the power train electronic control module (ECM) reads an abnormal signal from the engine speed sensor. The power train ECM will be unable to calculate the ratio of the torque converter.
The power train ECM compares the signals from the engine speed sensor and the torque converter output speed sensor. A CID 0190 FMI 02 diagnostic code is recorded when the engine speed sensor signal is below the dropout signal level, and the torque converter output speed sensor senses the engine speed as above low idle.
Note: The engine must be running in order for the power train ECM to show this diagnostic code.
Test Step 1. CHECK THE RESISTANCE OF THE SENSOR
- Turn the key start switch and the disconnect switch to the OFF position.
- Disconnect the machine harness from the speed sensor.
- Measure the resistance between the two contacts of the speed sensor connector.
Expected Result:
The resistance is between 90 and 250 Ohms.
Results:
- OK - The resistance is between 90 and 250 Ohms. The speed sensor is not faulty. Proceed to Step 2.
- NOT OK - The resistance is not between 90 and 250 Ohms.
Repair: The speed sensor has failed. Replace the sensor. Adjust the speed sensor properly when you install the sensor. Refer to Testing and Adjusting, "Speed Sensor - Adjust".
STOP
Test Step 2. CHECK THE RETURN CIRCUIT
Note: The machine harness remains disconnected from the sensor.
- Turn the key start switch and the disconnect switch to the OFF position.
- Measure the resistance between contact (wire 202-BK) and the frame ground.
Expected Result:
The resistance is 20 Ohms or less.
Results:
- OK - The resistance is 20 Ohms or less. The return circuit is correct. Proceed to Step 3.
- NOT OK - The resistance is not 20 Ohms or less.
Repair: The return circuit (wire 202-BK) has excessive resistance (open). Repair the machine harness or replace the machine harness.
STOP
Test Step 3. CHECK THE SIGNAL CIRCUIT FOR AN OPEN IN THE MACHINE HARNESS
- Insert a 7X-1710 Multimeter Probe between the two contacts of the speed sensor.
- Disconnect machine harness connectors J1 and J2 from the power train ECM.
- At the machine harness connectors, measure the resistance from J2-38 (sensor signal) to J1-15 (return).
Expected Result:
The resistance is less than 5.0 Ohms.
Results:
- OK - The resistance is less than 5.0 Ohms. The signal circuit in the machine harness is correct. Proceed to Step 4.
- NOT OK - The resistance is not less than 5.0 Ohms.
Repair: The signal circuit (wire 450-YL) is open in the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 4. CHECK THE SIGNAL FOR A SHORT
- Remove the 7X-1710 Multimeter Probe .
- At the machine harness connector, Measure the resistance between J2-38 (wire 450-YL) and all contacts that are used in the machine harness connectors for the power train ECM.
Expected Result:
Each resistance is greater than 5000 Ohms.
Results:
- OK - Each resistance is greater than 5000 Ohms. The machine harness is correct. Proceed to Step 5.
- NOT OK - Each resistance is not greater than 5000 Ohms.
Repair: There is a short in the machine harness. The short is between J2-38 (wire 450-YL) and the contact with the low resistance. Repair the machine harness or replace the machine harness.
STOP
Test Step 5. CHECK IF THE DIAGNOSTIC CODE IS STILL PRESENT
- Clean the contacts of the harness connectors.
- Reconnect all harness connectors.
- Turn the key start switch and the disconnect switch to the ON position.
- Start the engine and run the engine at low idle.
- Check the status of the CID 0190 FMI 02.
Expected Result:
The CID 0190 FMI 02 is not active.
Results:
- OK - The CID 0190 FMI 02 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.
Repair: Resume normal operation.
STOP
- NOT OK - The CID 0190 FMI 02 is active. The diagnostic code has not been corrected. Proceed to Step 6.
Test Step 6. CHECK THE ADJUSTMENT OF THE SENSOR
- Turn the disconnect switch and the key start switch to the ON position.
- Perform the adjustment procedure for the sensor, if necessary. Then perform the calibration of the position sensor. Refer to the Testing and Adjusting section of the manual for additional information on these procedures.
- Start the engine and run the engine at low idle.
- Check the status of the CID 0190 FMI 02.
- Check the status of the diagnostic code.
Expected Result:
The CID 0190 FMI 02 is not active.
Results:
- OK - CID 0190 FMI 02 is not active. The adjustment and/or the calibration has corrected the failure. Resume normal operation. Proceed to Step 7.
- NOT OK - CID 0190 FMI 02 is still active.
Repair: Exit this procedure. Perform this procedure again.
STOP
Test Step 7. CHECK IF THE DIAGNOSTIC CODE IS STILL PRESENT
- Clean the contacts of the harness connectors.
- Reconnect all harness connectors.
- Turn the key start switch and the disconnect switch to the ON position.
- Start the engine and run the engine at low idle.
- Check the status of the CID 0190 FMI 02.
Expected Result:
The CID 0190 FMI 02 is not active.
Results:
- OK - The CID 0190 FMI 02 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 0190 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. Perform the adjustment procedure for the sensor, if necessary. Then perform the calibration procedure for the sensor. Perform this procedure again. If the cause of the failure is not found, replace the ECM. See the Testing and Adjusting, "Electronic Control Module - Replace".
STOP