3-2 TIMING CONTROL OPERATION [GF4AX-EL]

BUE051718880N22

3-2 Timing Control Determination

• The PCM performs control by sending an on/off signal to the 3-2 timing solenoid when the following shifting occurs: 1→2, 2→3, 3→O/D, O/D→3, 3→2, 3→1, and 2→1.

• 3-2 timing valve hydraulic circuits are switched according to 3-2 timing solenoid on/off operation and 2-4 brake band engagement and release pressures are momentarily bypassed to allow for timing control during shifting.

3-2 Timing Control Inhibited Determination

• The 3-2 timing solenoid remains off when any of the following conditions are met:

- 3-2 timing solenoid has a malfunction

- When in D or 2 ranges, and shift solenoid A, B or C has a malfunction

• If in 1 range and the shift solenoid A, B or C have a malfunction, the 3-2 timing solenoid remains on.

3-2 Timing Learning Control

• 3-2 timing learning control is performed to minimize shift shock and other negative characteristics due to deviation of parts and deterioration over time. Shift shock may increase after the negative battery cable is removed since this clears the learning data but the shock will gradually be reduced as the vehicle is driven.