Toyota Corolla (E120): Circuit description

When the idle switch is turned on, a signal is sent to the cruise control ecu assy. The cruise control ecu assy uses this signal to correct the discrepancy between the throttle valve position and the actuator position sensor values to enable accurate cruise control at the set speed. If the idle switch is malfunctioning, problem symptoms also occur in the engine, so also inspect the engine.

Wiring diagram

Wiring diagram

Inspection procedure

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    Starting the engine
    ► Automatic transmission or continuously variable transmission 1 Check that the parking brake is set. 2 Check that the shift lever is set in P. 3 Firmly depress the brake pedal. 4 Turn the engine switch to the “START” position and start the engine. ► Manual transmission 1 Che ...

    LDA (Lane Departure Alert)
    Basic functions The LDA system warns the driver if the vehicle may deviate from the current lane or course*, and also can slightly operate the steering wheel to help avoid deviation from the lane or course*. The front camera is used to detect lane lines or a course*. *: Boundary between the asphal ...

    Inspection
    1. Inspect defogger relay (marking: def) Remove the defogger relay from the instrument panel j/b.  inspect the defogger relay. Standard: If the result is not as specified, replace the relay ...