Traction Control; Cruise Control - Mazda RX-8 2004 Service Highlights

Traction Control

• The PCM calculates the target throttle valve opening angle by the torque up/down request signal from the DSC
HU/CM and TCM and the engine speed.

Cruise Control

• Calculates the throttle valve opening angle based on the deviation of the actual vehicle speed from the set
vehicle speed which was set with the cruise control switch and sends a duty signal to the throttle valve
actuator.
• The PCM controls the actual vehicle speed so that it is close to the set vehicle speed.
STANDBY
VEHICLE SPEED
SETTING
VEHICLE
SPEED
0 km/h
{0 mph}
ON/OFF
ON
RES ACC
SET COAST
SET
CANCEL
• The cruise control includes the cruise control operation condition and the cruise control stop condition.
Cruise control operation condition
• When all of the following conditions are met, execution of the cruise control system is enabled (cruise control
standby status).
— Cruise control main switch: ON
— Vehicle speed: Exceeds 27 km/h {16.8 mph}
Cruise control stop condition
• When any of the following conditions are met even while in cruise control, the PCM stops the cruise control and
clears the set vehicle speed.
— Ignition switch: OFF
— Cruise control main switch: OFF
— Cruise control related DTCs (P0564, P0571) detected
• When any of the following conditions are met even while in cruise control, the PCM stops the cruise control
while storing the set vehicle speed.
— Cancel switch: ON
— Neutral switch (MT) or CPP switch (MT): ON
— Inhibitor switch (AT) P/N position switch: ON
— Vehicle speed: Less than 22.5 km/h {13.9 mph}
— Brake switch: ON
— The actual vehicle speed is 15 km/h {9.3 mph} or more lower than the set vehicle speed during cruise
control (ascending).
— Condition where actual vehicle speed is 15 km/h {9.3 mph} or more lower than the set vehicle speed
continues for 60 s or more even when the RESUME/ACCEL switch is on.
CONTROL SYSTEM
ACCELERATION
DECELERATION
ACC TAP UP
COAST
STANDBY
RESUME
OFF
RES
TAP DOWN
CANCEL
01–40
SET
VEHICLE
SPEED
CLEAR
ACTUAL
VEHICLE SPEED
SET
VEHICLE SPEED
CHU0140S077
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