Checking the torque converter stall speed

DP0

Essential equipment

diagnostic tool

• Position the vehicle on a two-post lift.
• Raise the vehicle until the wheels are a few centimetres off the ground.
• Connect the diagnostic tool ("CLIP").
• Communicate with the automatic gearbox control module.
• Monitor the automatic gearbox oil temperature parameter.

  The check must be carried out with the oil temperature between 60 °C and 80 °C.

• Start the engine and select D.
• Monitor the engine speed parameter.
• Establish communication with the ECU.
• Press the accelerator fully to the floor, keeping the brakes applied.

The front wheels must not turn.

WARNING

• The accelerator must not be held fully depressed for more than 5 seconds. Beyond this, there is a high risk of destroying the torque converter or the automatic gearbox.
• Once the measurement is complete, release the accelerator and keep the brakes applied until the engine speed stabilises at idle (failure to do so risks damaging the automatic gearbox).

K4M

• Engine speed must stabilise at 2700 rpm +/- 150.

F4R

• Engine speed must stabilise at 2500 rpm.
• A stall speed outside the tolerance requires replacing the torque converter.

Note: A stall speed that is too low may be caused by insufficient engine power.