CONTROL SYSTEM
01–40–11
01–40
MAIN RELAY CONTROL OUTLINE [LF]
E5U014000000N56
• When the ignition switch is turned to the ON position, the main relay turns on.
• When the ignition switch is turned from on to off, the main relay turns on for a few minutes to activate the fully-
closed throttle learning function of the drive-by-wire control, the after-cleaning function of the electrical fan
control, and EVAP system leak detection function of the EVAP control system.
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MAIN RELAY CONTROL BLOCK DIAGRAM [LF]
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• The PCM controls the main relay on/off, based on commands from the ignition switch or the controls.
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MAIN RELAY CONTROL OPERATION [LF]
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• When the ignition switch is turned to the ON position, the main relay turns on and power is supplied to sensors
and devices.
• When the ignition switch is turned from on to off, a main relay on command signal is received the main relay
turns on and the following actions take place:
1. Throttle valve control: Fully closed throttle learning function (See 01–40–13 DRIVE-BY-WIRE CONTROL
OPERATION [LF].)
2. After-cooling function of the electrical fan control (See 01–40–34 ELECTRICAL FAN CONTROL
OPERATION [LF].)
3. EVAP system leak detection function of the EVAP control system (See 01–16–7 EVAPORATIVE
EMISSION (EVAP) CONTROL SYSTEM OUTLINE [LF].)
• When the on request signal from the controls stop, the main relay turns off.
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DRIVE-BY-WIRE CONTROL OUTLINE [LF]
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• The drive-by-wire control calculates the optimum target throttle valve opening angle at all ranges of engine
speeds and controls the throttle valve actuator.
• The drive-by-wire control includes idle speed control, accelerator control, traction control and cruise control.
Control List
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PCM
MAIN RELAY
IGNITION SWITCH
E5U140ZT5301
Control name Control Outline
Idle speed control • Controls the throttle valve opening angle during idling so that the idle speed is at the
target idle speed.
Accelerator control • Controls the throttle valve opening angle according to the amount of AP depression.
Has a fully-closed throttle learning function for consistent setting of the optimum
throttle opening angle according to changes due to age deterioration.
Traction control • Controls the throttle valve opening angle by torque up/down request signals from the
DSC HU/CM and TCM (AT).
Cruise control • Sets the vehicle speed by operation of the cruise control switch and controls the
throttle valve opening angle so that it becomes close to the set vehicle speed.
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