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:

    Overhaul
    1. Remove cylinder block water drain cock sub–assy Remove the cylinder block water drain cock from the cylinder block. 2. Inspect connecting rod thrust clearance Using a dial indicator, measure the thrust clearance while moving the connecting rod back and forth. Standard t ...

    Listening to an iPod
    Connecting an iPod enables you to enjoy music from the vehicle speakers. Select “iPod” on the audio source selection screen. When the iPod connected to the system includes iPod video, the system can only output the sound by selecting the browse screen. Connecting an iPod Audio control scre ...

    Pre–check
    1. Pre–check Check that the cruise control actuator assy, acceleration wire, accelerator auto drive cable assy, and link assy are installed correctly and that the wire and link are securely connected. check that the operating movement of the acceleration pedal, cruise control actu ...