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2016 – MX-5 – Engine

GEAR SHIFT INDICATOR [SKYACTIV-G 2.0]

Purpose

• The gear shift indicator, built into the instrument cluster, informs the driver that a gear position or shift up/down operation is recommended according to the driving conditions.

Function

• The PCM sends a gear shift indicator illumination request to the instrument cluster via CAN communication.

• The instrument cluster displays the gear shift indicator based on the gear shift-related information signals sent from the PCM as CAN signals.

Construction

• The gear shift indicator is built into the instrument cluster.

Operation

• The PCM compares the target gear speed (calculated from each signal) and the actual gear speed to determine a gear shift indicator illumination request.

  

Target gear speed (recommended gear position)

• The target gear speed is determined by the vehicle speed, accelerator pedal opening angle, ascent rate, altitude, and steering angle.

Actual gear speed (current gear position)

• The actual gear speed is determined by the vehicle speed, engine speed, tire diameter, final gear ratio, and gear engagement.

• The gear shift indicator illumination/off conditions are as follows:

Gear shift indicator illumination condition

• There are three gear shift indicator illumination patterns; normal operation, shift-down recommended operation, and shift-up recommended operation.

Normal operation

• When the following condition is met, the currently selected gear position is indicated.

• Target gear speed and actual gear speed are equal

• Example: the following figure indicates that the currently selected gear position is 5th gear.

  

Shift-down recommended operation

• If a shift-down operation is recommended when the following condition is met (determines smooth driveability is difficult), the recommended gear position is indicated at the same time.

• Target gear speed is lower than actual gear speed

• Example: The following figure indicates that a shift-down operation to 4th gear is recommended.

  

Shift-up recommended operation

• If a shift-up operation is recommended when the following condition is met (determines fuel economy worsens), the recommended gear position is indicated at the same time.

• Target gear speed is higher than actual gear speed

• Example: The following figure indicates that a shift-up operation to 6th gear is recommended.

  

Gear shift indicator off condition

• When any one of the following conditions is met, the gear shift indicator turns off.

• Vehicle is stopped

• Shift lever is in N position or R position

• If the vehicle is driven with the gear not changed when a shift-down/up operation is recommended, the gear shift indicator may temporarily turn off.

Fail-safe

• Not applicable

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