Procedure To Learn A Smooth 1st Neutral To Drive Shift
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NOTE:
Transmission fluid temperature must be between 80-110°F (27-43°C).
Perform this procedure only if the complaint is for a delayed or harsh shift the first time the transmission is put into gear after the vehicle is allowed to set with the engine not running for at least 10 minutes. Use the following steps to have the TCM learn the 1st N-1 UD Clutch Volume Index (CVI).
- Start vehicle only when the engine and ignition have been off for at least 10 minutes.
- With the vehicle at a stop and the service brake applied, record the UD CVI while performing a Neutral to Drive shift. During the shift, the UD CVI will temporarily show a different value which is the 1st N-1 UD CVI. The 1st N-1 UD CVI account for air entrapment in the UD clutch that may occur after the engine has been off for a period of time.
- Repeat steps 1 and 2 until the recorded 1st N-1 UD CVI value stabilizes.