Mazda 2006 MX-5 Service Highlights page 139

Cruise control function
• The cruise control includes accelerating, coasting, resume, tap-down, tap-up and downshift functions (AT).
Function List
Function
• When any of the following conditions are met while driving in cruise control and when the RES/+
Accelerating
switch is continuously pressed, the PCM gradually increases the set vehicle speed.
— Except during resume operation
— The RES/+ switch is on one time or more during resume operation.
• When the SET/- switch is continuously pressed, the PCM gradually decreases the set vehicle
Coasting
speed.
• When the RES/+ switch signal is input to the PCM during regular driving (cruise control is stopped)
Resume
and the previously set vehicle speed is stored in the PCM, the PCM sets the set vehicle speed to
the previously set vehicle speed and begins control.
• When all of the following conditions are met while driving in cruise control, the PCM decreases the
Tap down
set vehicle speed by 1.6 km/h {1.0 mph} and controls the throttle valve actuator.
— During cruise control
— RES/+ switch off
— The RES/+ switch switches from off to on
— When actual vehicle speed is lower (set vehicle speed +2.0 km/h {+1.2 mph})
• When all of the following conditions are met, the PCM increases the set vehicle speed by 1.6 km/h
Tap-up
{1.0 mph} and controls the throttle valve actuator so that the vehicle speed is close to the set vehicle
speed.
— During cruise control
— The RES/+ switch switches from off to on
• When the following conditions are met, a downshift signal is sent to the TCM via CAN.
Downshift (AT)
— RES/+ switch on
— Target vehicle acceleration is not reached
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DRIVE-BY-WIRE RELAY CONTROL OUTLINE [LF]
• Supplies power to the drive-by-wire control.
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DRIVE-BY-WIRE RELAY CONTROL OPERATION [LF]
• When the main relay is on, the drive-by-wire relay also turns on. (See 01–40–11 MAIN RELAY CONTROL
OPERATION [LF].)
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VARIABLE INTAKE AIR CONTROL OUTLINE [LF]
• Energizes the variable intake air solenoid valve according to engine speed for enhanced inertia charging effect.
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VARIABLE INTAKE AIR CONTROL BLOCK DIAGRAM [LF]
CKP SENSOR
TP SENSOR NO.1, NO.2
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CONTROL SYSTEM
Contents
PCM
E5U014000000N61
E5U014000000N62
E5U014000000N16
E5U014000000N17
VARIABLE INTAKE AIR
SOLENOID VALVE
E5U140ZT5001
01–40–15
01–40