Toyota Corolla (E120): Circuit description

If the ignition switch is turned to the on position, battery positive voltage is applied to the switches, such as terminal ig of the ecu.

Wiring diagram

Inspection procedure

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    Purpose of the readiness tests
    The on–board diagnostic (obd ii) system is designed to monitor the performance of emission–related components and report any detected abnormalities in the form of diagnostic trouble codes (dtcs). Since the various components need to be monitored during different driving condition ...

    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 ...

    Circuit description
    In the diagram below, when the engine is cranked, current flows from terminal st2 of the ignition switch to the starter relay coil and also current flows to terminal sta of the ecm (sta signal). When the sta signal and ne signal are input to the ecm, tr is turned on, current flows to the c ...