TOUCHPOINT Adaptions

WARNING: This page is about a different car, the 2018 Land Rover Discovery Sport. However, it is still accessible from the selected car via links, so may be relevant.

The transmission is supplied by ZF with Touchpoint Adaptions set in the Transmission Control Module (TCM) at the factory which match the transmission to which the TCM is attached.

CAUTION: TOUCHPOINT ADAPTIONS MUST ONLY BE PERFORMED WHEN A NEW TCM OR A TCM FROM ANOTHER VEHICLE HAS BEEN FITTED. UNDER NO OTHER CIRCUMSTANCES MUST TOUCHPOINT ADAPTIONS BE PERFORMED. Resetting Touchpoint Adaptions for any reason other than replacing the TCM could result in poor shift performance if the procedure is carried out unnecessarily.

Before performing a diagnostic Touchpoint Adaption reset procedure using an approved Land Rover diagnostic system, ensure the following conditions are applied:

the Automatic Transmission Fluid (ATF) is at a temperature greater than 30 degrees C (86 degrees F)

the Transmission Control switch (TCS) is in the 'Park' position

the vehicle is stationary

the engine is running at idle speed

Brake pressure applied using the foot brake

the Electric Parking Brake (EPB) is applied and held on manually to ensure it does not release when 'Drive' is selected

no faults or Diagnostic Trouble Codes (DTCs) are present in the TCM.

NOTE: If the EPB is allowed to release, the Touchpoint Adaption reset procedure will be terminated.

When the transmission is built, it is tested at the ZF factory to determine how much electrical current is required by each Pressure Control Valve (PCV) to attain a datum engagement point. The engagement (Touchpoint) is determine by a predefined level of friction in the clutch plates.

This data is stored with the serial number of the transmission and the same data is written to the TCM fitted to that transmission. This ensures that each transmission has a uniform performance.

If the Touchpoint Adaption data is not available because the TCM or the transmission has been replaced, the Touchpoint Adaptions contained in the TCM will be incorrect for the transmission. This will result in harsh clutch engagements and could cause damage to the transmission.

Using the Touchpoint Adaptions learning routine in the approved Land Rover diagnostic system, enables the TCM to establish the Touchpoint for all the clutches. Once the Touchpoint Adaptions have been learnt, the Clutch Adaptions routine must be performed to further refine the transmission operation.