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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    Inspection procedure
    1 Check voltage at ig2 of airbag sensor assy center Disconnect the negative (–) terminal cable from the battery, and wait at least for 90 seconds.  disconnect the connector of the airbag sensor assy center.  connect the negative (–) terminal cable to the battery, and wa ...

    Confirmation driving pattern
    Connect the hand–held tester or the obd ii scan tool to the dlc3.  record dtcs and the freeze frame data.  set the check mode using the hand–held tester .  read the value on the misfire counter for each cylinder when idling. If the value is displayed on the misfire c ...

    Throttle body assy
    Components Removal & installation and disassembly & reassembly 1. Drain coolant 2. Remove cylinder head cover no.2 Remove 2 nuts, 2clips and the cylinder head cover no. 2. 3. Remove air cleaner cap sub–assy Disconnect the maf connector.  disconnect the vsv co ...