Additional Service When Replacing Control Valve: Description

When replacing the control valve, perform the following work. For work procedure. Refer to Work Procedure .

ERASING, LOADING AND STORING OF CALIBRATION DATA

• The TCM acquires calibration data (individual characteristic value) of each solenoid that is stored in the ROM assembly (in the control valve). This enables the TCM to perform accurate control. For this reason, after the control valve is replaced, it is necessary to erase the calibration data previously stored in TCM, to load new calibration data, and to store them.

ERASING THE LEARNED VALUE DATA

• TCM learns indicated pressure for appropriate control of the control valve and records the learned values. For this reason, the leaned values stored in TCM must be erased after replacing a control valve.

ERASING CVT FLUID DEGRADATION LEVEL DATA

• TCM records the degradation level of the CVT fluid calculated from the vehicle driving status. Therefore, if the control valve is replaced, it is necessary to erase the CVT fluid degradation level data recorded by TCM.

AUXILIARY GEARBOX CLUTCH POINT LEARNING

• A clutch characteristics value of auxiliary gearbox in TCM memory changes when the control valve is replaced. This disables a targeted clutch control. Accordingly, it is necessary to record clutch characteristics again after the control valve is replaced.