Transmission Control Unit Solenoids

Transmission Control Unit Solenoids

Note! As the illustrations in this service information are used for different model years and / or models, some variation may occur. However, the essential information is always correct.

Preparatory work

Removing the control system cover
Remove the control system's casing according to: Cover, control system, B5254T7, AW55-50/51SN Cover, Control System.

Removal

Disconnecting the solenoid connector

Caution! Work carefully to avoid damage to the wiring and connectors.




Disconnect the connectors from the solenoids.

Diagnostic testing of the solenoids, SLS, SLT and SLU





Note! Readings should be taken at approximately 20 °C.

Solenoid SLS, SLT and SLU
Measure the resistance between both the pins in the solenoid connector.
Correct value: 5.0-5.6 ohms.

If the value of any of solenoids SLS, SLT and SLU is incorrect
Replace the control system.
The control system is calibrated together with the solenoids.

Diagnostic testing of solenoid S1-S5





Note! Readings should be taken at approximately 20 °C.

Solenoid S1
Measure the resistance between the pin in the solenoid connector and the transmission ground terminal.
Correct value: 12-16 ohms.

Solenoids S2-S5
Measure the resistance between the pin in the solenoid connector and the transmission ground terminal.
Correct value: 11-15 ohms.

If the resistance of any of solenoids S1-S5 is incorrect
Replace the solenoid. See: Replacing solenoid S1-S5.

Replacing solenoid S1-S5




Remove the screw from the solenoid. Remove the solenoid from the control system.
Lubricate the O-ring on the new solenoid. Use automatic transmission fluid.
Install the solenoid. Tighten the screw. See: Tightening torque, B5254T7, AW55-50/51SN, B5254T7, M66 Tightening Torque.

Installation

Installing the solenoid connector

Caution! Work carefully to avoid damage to the wiring and connectors.




Connect the connectors to the solenoids.

Finishing

Installing the control system cover
Install the control system cover. See: Cover, control system, B5254T7, AW55-50/51SN Cover, Control System.