MANUAL MODE SHIFT CONTROL OPERATION


BHE051318901T12

Manual mode shift

• When the selector lever is shifted over from the D to M range position, the M range switch in the selector lever component turns on, sending a manual mode command signal to the TCM which activates the manual mode shift control.

• When in manual mode and the selector lever is operated in the back (+) direction, the up switch in the selector lever component is turned on and an up-shift command signal is inputted to the TCM.

– The TCM, triggered by the up-shift command signal, carries out shifting by outputting an operation signal to the shift solenoid if the ATF temperature is not low (for 3GR only), vehicle speed is higher than the set speed and the gear position is 3GR or lower.

• Conversely, when the selector lever is operated in the forward (-) direction, the down switch in the selector lever component turns on, and a down-shift command signal is inputted to the TCM.

– The TCM, triggered by the down-shift command signal, carries out shifting by outputting an operation signal to the shift solenoid if the vehicle speed is less than the set speed and the gear position is 2GR or above.

• The up/down operation of the steering wheel shift switch is the same as the manual operation of the selector lever.

• The TCM utilizes a specialized M range automatic shift diagram. Due to this, restriction of manual shift demand and automatic control of downshifting is carried out, reducing load on the AT, preventing engine over-rev and ensuring drive stability.

Condition

Shift control

Note

2GR→ 3GR up-shift command at low speed
• To reduce load on the AT, upshifting is inhibited until vehicle reaches speed possible for upshifting
• Selector indicator "M" light and gear position indicator light flash to alert driver
3GR→ 4GR up-shift command, low ATF temperature
• To reduce load on the AT, upshifting to 4GR is inhibited
4GR→ 3GR down-shift command, above set speed
• To prevent engine over-rev, downshifting is inhibited until vehicle reaches speed possible for downshifting
3GR→ 2GR down-shift command, above set speed
2GR→ 1GR down-shift command, above set speed
In 4GR deceleration, speed goes below coast-down set speed (deceleration down- shift)
• To assure drive stability, automatically downshifts from 4GR to 3GR.
-
In 3GR deceleration, speed goes below coast-down set speed (deceleration down- shift)
• To assure drive stability, automatically downshifts from 3GR to 2GR and 3GR to 1GR.

Shift diagram

1
TCC operation available
2
Throttle opening
3
Vehicle speed km/h {mph}
4
Downshifting is inhibited until vehicle reaches speed possible for downshifting
5
When decelerating below set vehicle speed, executes automatic downshifting
6
Upshifting is inhibited until vehicle reaches speed possible for upshifting
7
4GR TCC off
8
4GR TCC on