Mazda Capella automatic transmission control unit
Location
* Usually located under the hood, next to the engine.
Functions
* Controls gear shifting and other automatic transmission functions, including torque converter lock-up and downshifting.
* Receives signals from various sensors and switches to determine proper gear shift timing.
* Regulates fluid pressure in the automatic transmission for smooth gear shifting.
Fault codes
The Mazda Capella automatic transmission control unit can store fault codes that can be read using a diagnostic scanner. Some common trouble codes include:
* P0705 – input shaft speed sensor malfunction
* P0730 – torque converter clutch malfunction
* P0741 – torque converter lockup clutch solenoid malfunction
* P0753 – malfunction of the 1st to 2nd gear shift solenoid
* P0765 – malfunction of the 2nd to 3rd gear shift solenoid
Troubleshooting Guide
* Check the level and condition of the fluid in the automatic transmission.
* Check for fluid leaks in the automatic transmission.
* Check automatic transmission sensors and switches.
* Check the wiring and connectors of the automatic transmission.
* Scan with a diagnostic scanner for trouble codes.
Note
The automatic transmission control unit is a complex component and can be expensive to replace. It is always recommended to first carry out a thorough diagnosis before proceeding with replacing the control unit.