Automatic transmission control unit (TCU)
In the Ford Explorer II, the automatic transmission control unit is an electronic component that controls the operation of the automatic transmission. The TCU receives input signals from various sensors and switches and then sends commands to the electronic solenoids and hydraulic valves in the automatic transmission to change gears and control torque converter lockup.
Location:
The TCU is usually located under the engine hood, most often next to the automatic transmission itself or in the automatic transmission pan.
Functions:
The TCU performs the following functions:
* Reads signals from speed, temperature, pressure and throttle position sensors.
* Determines when to shift gears based on input signals.
* Sends commands to electronic solenoids and hydraulic valves to change gears.
*Adjusts torque converter lockup for improved fuel economy and performance.
* Diagnoses and stores fault codes related to automatic transmission.
Symptoms of a faulty TCU:
A faulty TCU can result in the following symptoms:
* Problems with gear shifting
* Gear slipping or slipping
* Increased fuel consumption
* Automatic transmission related fault codes
*Flashing or missing gear indicator on dashboard
TCU replacement:
If the TCU is faulty, it must be replaced. The replacement process usually includes:
* Battery disconnection
* Removing the automatic transmission pan
* Removing the faulty TCU
* Installation of new TCU
* Connection to wiring
* Reset automatic transmission adaptations
* Automatic transmission testing
Important: TCU replacement must be performed by a qualified mechanic as it requires special tools and knowledge.