Auto Idle Stop System - Control
Basic Operation
Vehicle is stopping or is stopped.
When the vehicle is stopped after driving at or above the specified speed, and the transmission is in D or N, the engine stops when you press the brake pedal. Releasing the brake pedal disables auto idle stop and restarts the engine.
Restart by Climate Control Unit.
The PCM restarts the engine from auto idle stop if it is requested by the climate control unit.
System Indicators
If there is an operation error or a system failure during auto idle stop, the error information is shown on the multi-information display (MID), the indicator in the gauge control module (tach) blinks, and the system buzzer sounds.
Opening the Driver's Door.
If the driver's door is opened during auto idle stop, the auto stop indicator blinks and the system buzzer sounds to remind you that auto idle stop is in operation.
Auto Idle Stop Control by the Climate Control System
When you operate the climate control unit (except the OFF and RECIRCULATION functions), auto idle stop is managed by the climate control system. The climate control unit calculates the enabling/disabling and the allowable time for auto idle stop. This is based on the ECON mode, the battery module temperature, and signals transmitted from several sensors.
When idle stop is enabled, the PCM sets the allowable time in the idle stop cancellation counter. When the counter reaches zero, the engine restarts. Turning on the defogger switch or selecting DEF on the mode switch causes the climate control unit to request an engine restart from the PCM.
Climate control unit decision criteria for auto idle stop
The decision criteria is based on which driving mode is selected ECON ON mode or ECON OFF mode. In ECON ON mode, the enabling of auto idle stop has a higher priority than in ECON OFF mode. If the climate control unit calculates any time less than 10 seconds, auto idle stop is not enabled.
Request by the motor control module (MCM) to increase air volume of blower motor
When the temperature of battery module is high, the MCM signals the climate control unit for an increase in air volume from the blower motor. The climate control unit then increases the blower motor speed.