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SHIFT POINT CONTROL (MANUAL SHIFT CONTROL)

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2016 – MX-5 – Transmission/Transaxle

SHIFT POINT CONTROL (MANUAL SHIFT CONTROL)

Outline

  • The TCM operates the manual shift control when the M position is selected.

  • If the M position is selected, manual shifting is prioritized according to the driver’s shift up/shift down operation. However, to assure driving safety and protect the engine and AT, minimum automatic shifting may occur.

Construction

Block diagram

Operation

  • Gears can be selected by moving the selector lever back and forth while driving in the M position.

  • When shifting the selector lever from the D to M position while driving, the gear being used while driving in the D position is maintained. For driving in D position 6th gear, however, when shifting the selector lever from the D to M position with the accelerator pedal not depressed, the gear shifts from 6th to 5th gear. For driving in 5th gear, when shifting the selector lever from the D to M position with the accelerator pedal not depressed, the gear shifts from 5th to 4th gear.

  • When a shift down is performed using the selector lever with the accelerator pedal not depressed and the selector lever in the M position, blipping control (synchronization to engine speed) is performed.

  • When the accelerator pedal is fully depressed while driving in the M position, kickdown shifting is performed to bring out vehicle’s acceleration performance, and If the engine reaches a high engine speed with the accelerator pedal is fully depressed, shift-up is performed automatically.

    NOTE:

    • When the DSC OFF switch is pressed to disable TCS/DSC control, kickdown shifting and automatic shift-up are not performed.

  • During manual shift control, in every gear speed, engine brake force can be obtained corresponding to the gear ratio. In addition, if the vehicle speed reaches a constant speed or less, shift-down is performed automatically.

Shifting operation and manual transmission

Shift operation

Gear

Gear shift enabled/disabled

Shift-up operation

Operates once

1GR to 2GR

Enabled when both driving and stopped

2GR to 3GR

Enabled when driving at specified vehicle speed or more

3GR to 4GR

4GR to 5GR

5GR to 6GR

Operates 2 times consecutively

1GR to 3GR

2GR to 4GR

3GR to 5GR

4GR to 6GR

Operates 3 times consecutively

1GR to 4GR

2GR to 5GR

3GR to 6GR

Operates 4 times consecutively

1GR to 5GR

2GR to 6GR

Shift-down operation

Operates once

6GR to 5GR

Enabled when driving at specified vehicle speed or less

5GR to 4GR

4GR to 3GR

3GR to 2GR

2GR to 1GR

Operates 2 times consecutively

6GR to 4GR

5GR to 3GR

4GR to 2GR

3GR to 1GR

Operates 3 times consecutively

6GR to 3GR

5GR to 2GR

4GR to 1GR

Operates 4 times consecutively

6GR to 2GR

5GR to 1GR

  • The gear shifting operation may cancel depending on the vehicle speed. If a shift-down operation is canceled, the gear position indicator illuminates to alert the driver.

  • If the engine reaches a high engine speed, the following controls are performed to protect the engine:

    • The throttle valve is squeezed so that the engine speed does not exceed the excess speed range and the engine speed is stabilized at a lower speed than the excess speed range.

    • If the high engine speed condition continues, the engine speed is lowered by a forced shift-up of the gears.

2nd gear fixed mode
  • When the vehicle is stopped or the vehicle speed is extremely low, the selector lever is moved to the + side and the transmission is in 2nd gear.

  • On slippery surfaces such as snow-bound roads, forward acceleration and driving is facilitated. While in 2nd gear fixed mode and the selector lever is shifted to gears other than 2nd gear, the 2nd gear fixed mode is canceled.

  • If the accelerator pedal is fully depressed in 2nd gear fixed mode, kickdown shifting is performed and the 2nd gear fixed mode is cancelled.

Direct mode
  • When the steering shift switch is operated while driving with the selector lever in the D position, the gear position may temporarily switch. While in the direct mode, D and M illuminate in the indicator light and the operating gear position is displayed. The direct mode is canceled under the following conditions:

    • Specified time has elapsed while driving at constant speed

    • Vehicle stopped or driving at low speed

    • Up switch for steering shift switch is pulled for certain period of time or more

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