Transmission Temperature Sensor/Switch: Service and Repair

Temperature sensor, transmission fluid, replacing

Note! Avoid skin contact with the transmission fluid.

Preparations
Switch off the ignition.

Remove the air cleaner (ACL) housing
See Brake pipe master cylinder / ABS unit, replacing Brake Pipe Master Cylinder / ABS Unit, Replacing

Remove the connector from the transmission




Separate the connector.
Ensure that the rubber gasket in the upper section of the connector remains in place.
Remove the mounting screws.
Lift the connector.

Separate the connector




Remove the cable clamps around the wiring and the rubber seal.
Remove the sockets from the connector casing.
Insert a screwdriver between the casing and socket. Press in the catch. At the same time, slide the sockets out of the casing.

Remove the socket for the cables




Remove the socket for the cables to the oil temperature sensor. 2- pin, pins 12 and 13.

Remove the wiring pins from the socket




Press in the catch on the underside of the socket. Slide out the red catch slightly.

Remove the splash guard under the engine




Drain the transmission oil.
Reinstall the oil plug again. Use a new gasket.
Tighten to 40 Nm .

Remove the oil temperature sensor




Clean thoroughly around the sensor. Remove it.
Collect the oil in a container.

Install the new sensor




Apply some petroleum jelly to the sensor O-ring. Tighten to 25 Nm .

Insert the cables between the oil cooler hose and control system cover




Install the splashguard under the engine.
Route the cables under the gear selector connector.
Take care not to damage the cables.

Install the cables in the socket




Pin 12: blue / red cable.
Pin 13: blue / black cable.
Check that the pins are correctly positioned in the socket.

Assemble the connector




Ensure that the rubber seal is in position.
Install the cable clamps around the cable harnesses and the rubber seal.
Check that the rubber gasket is in place on the upper section of the connector.

Connect the connector to the transmission




Tighten the screws. Tighten to 25 Nm .
Plug in the connector from the car.
Ensure that the rubber seal is in position in the upper section of the connector.

Install the air cleaner (ACL) housing
See Brake pipe master cylinder / ABS unit, replacing Brake Pipe Master Cylinder / ABS Unit, Replacing

Top up the transmission fluid

Note! After replacing the transmission oil, the "Transmission oil change" counter must be reset. See Resetting Transmission fluid change counter, AW55-50/51SN Resetting Transmission Oil Replacement Counter

Checking diagnostic trouble codes (DTCs)
Check and erase any diagnostic trouble codes (DTCs).