Speedometer drive Chevrolet Lacetti automatic transmission
The speedometer drive in a Chevrolet Lacetti with automatic transmission consists of the following components:
Speed sensor
*Located on the transmission housing and reads the rotational speed of the transmission output shaft.
* Generates electrical impulses, the frequency of which is proportional to the speed of the vehicle.
Engine control unit (ECU)
* Receives impulses from the speed sensor and processes them.
* Calculates vehicle speed and transmits data to the instrument cluster.
Instrument cluster
* Contains a speedometer that displays the vehicle’s speed in kilometers per hour.
* Receives speed data from the ECU and displays it on the dial.
Wiring
* Connects the speed sensor, ECU and instrument cluster.
*Transmits electrical impulses and data between these components.
Replacing the speedometer drive
If the speedometer drive is faulty, the following problems may occur:
* Incorrect speedometer readings
*No speedometer readings
* Problems with gear shifting (in some models)
To replace the speedometer drive in a Chevrolet Lacetti with automatic transmission, follow these steps:
1. Prepare the necessary tools (ratchet, extension, sockets).
2. Raise the car on a lift or place it on jacks.
3. Locate the speed sensor on the transmission housing.
4. Disconnect the electrical connector from the speed sensor.
5. Unscrew the speed sensor mounting bolt.
6. Remove the speed sensor.
7. Install the new speed sensor in reverse order.
8. Connect the electrical connector to the speed sensor.
9. Lower the vehicle.
Note:
* When replacing the speed sensor, the transmission fluid may need to be drained and replaced.
*Always refer to your specific vehicle’s repair manual for exact instructions.