Toyota Corolla (E120): Circuit description

When the ignition switch is turned on, battery positive voltage is applied to the coilwhich closes the contacts of the efi main relay (marked: efi) and supplies power to terminal +b of the ecm.

This signal causes current to flow to the coil, closing the contacts of the efi relay and supplying power to terminal +b of the ecm.

If the ignition switch is turned off, the ecm continues to switch on the efi relay for a maximum of 2 seconds for the initial setting of the isc valve.

Wiring diagram

Inspection procedure

    Share this page:

    Other materials:

    Windshield wipers and washer
    Operating the lever can use the windshield wipers or the washer. NOTICE ■When the windshield is dry Do not use the wipers, as they may damage the windshield. Operating the wiper lever Operating the lever operates the wipers or washer as follows. (U.S.A.) or (Canada) Intermittent windshield ...

    Turn signal lever
    Operating instructions 1 Right turn 2 Lane change to the right (move the lever partway and release it) The right hand signals will flash 3 times. 3 Lane change to the left (move the lever partway and release it) The left hand signals will flash 3 times. 4 Left turn ■Turn signals can b ...

    Favorite settings
    My Settings Drivers are identified using devices such as electronic keys to store the vehicle settings for each. Then the information can be recalled the next time the vehicle is driven. Authentication devices can be assigned in advance to drivers so that they can drive using their preferred settin ...