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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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CRUISE CONTROL SYSTEM [SKYACTIV-G 2.0]

Outline

  • By setting the vehicle speed using the cruise control switch, the cruise control system enables driving at a constant speed without having to operate the accelerator pedal.

  • The cruise control system reduces driver fatigue during long drives on expressways.

Function

  • The PCM maintains a constant vehicle speed by controlling the throttle valve actuator.

  • The relations between each component part and functions are as follows.

Component parts

Functions

Start stop unit

(CAN communication: cruise control switch condition signal)

ON

The cruise control system main switch. By operating the switch while the cruise control system is turned off, the cruise control system goes on stand-by.

OFF/CANCEL

The cruise control system main switch.

    Cruise control system operating

  • By operating the switch, the cruise control system goes on stand-by.

    Cruise control system stand-by

  • By operating the switch, the cruise control system turns off.

RESUME/+

  • By operating the switch while the cruise control system is on stand-by and the vehicle is driven normally at more than 25 km/h {16 mph}, the PCM starts control at the set vehicle speed stored in the PCM. (Operates system while PCM has stored previous set vehicle speed)

  • When the switch is pressed and released or continually pressed while the cruise control system is operating, the PCM performs acceleration control.

SET/−

  • By operating the switch while the cruise control system is on stand-by and the vehicle is driven normally at more than 25 km/h (16 mph), the PCM stores the vehicle speed at the moment the switch is pressed as the set vehicle speed, and starts control.

  • When the switch is pressed and released or continuously pressed while the cruise control system is operating, the PCM performs deceleration control.

Instrument cluster

CAN communication: parking brake switch signal

When the parking brake is applied, the cruise control system goes on stand-by. (The pre-set vehicle speed is stored.)

Cruise main indicator light (amber)

(See CRUISE MAIN INDICATOR LIGHT (AMBER), CRUISE SET INDICATOR LIGHT (GREEN) [SKYACTIV-G 2.0].)

Cruise set indicator light (green)

(See CRUISE MAIN INDICATOR LIGHT (AMBER), CRUISE SET INDICATOR LIGHT (GREEN) [SKYACTIV-G 2.0].)

Liquid crystal display (LCD) (pre-set vehicle speed display)

Displays the pre-set vehicle speed. (See LIQUID CRYSTAL DISPLAY (LCD).)

DSC HU/CM

CAN communication: vehicle speed signal

The DSC HU/CM sends the vehicle speed signal to the PCM.

CAN communication: brake pressure signal

If the brake pressure exceeds 0.3 MPa {3 kg/cm2, 44 psi}, the cruise control system goes on stand-by. (The pre-set vehicle speed is stored.)

Brake switch

When the brake pedal is pressed during cruise control, the cruise control system goes on stand-by. (The pre-set vehicle speed is stored.)

Clutch pedal position (CPP) switch (MT)

When the clutch pedal is pressed during cruise control, the cruise control system goes on stand-by. (The pre-set vehicle speed is stored.)

Neutral switch (MT)

When the shift lever is shifted to the neutral position during cruise control, the cruise control system goes on stand-by. (The pre-set vehicle speed is stored.)

TCM (AT)

CAN communication: gear signal

  • When the selector lever is shifted from D to N position during cruise control, the cruise control system goes on stand-by. (The pre-set vehicle speed is stored.)

  • The cruise control system does not operate when the selector lever is in the N or P position.

CAN communication: diagnostic signal

If there is a malfunction with the AT, the cruise control system goes on stand-by. (The pre-set vehicle speed is stored.)

PCM

The cruise control system starts or stops operation according to the cruise control switch ON/OFF signal. During cruise control, the system controls the vehicle speed to the previously set vehicle speed by operating the throttle valve actuator.

Throttle valve actuator

Adjusts the throttle valve opening angle according to the duty signal received from the PCM.

Structural View

Block Diagram

Operation

1. When the cruise control switch is operated (1), the start stop unit sends (2) a cruise control switch condition signal to the PCM via CAN communication.
2. When the PCM receives the cruise control condition signal, it controls (3) the throttle valve actuator according to the set vehicle speed. At the same time, the PCM sends (4) a cruise main indicator light (amber)/cruise set indicator light (green) illumination request signal and a pre-set vehicle speed display request signal to the instrument cluster via CAN communication.

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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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