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:

    Inspection procedure
    Hint Advanced timing over (valve timing is out of specified range) P0011 Retarded timing over (valve timing is out of specified range) P0012 If dtc p0011 or p0012 is displayed, check the vvt system circuit. Read freeze frame data using the hand–held tester o ...

    Transmission valve body assy (atm)
    Replacement 1. Remove engine under cover lh 2. Drain automatic transaxle fluid  remove the drain plug, gasket and drain atf.  install a new gasket and drain plug. Torque: 17.5 Nvm (178 Kgf·cm, 13 ft·lbf) 3. Remove automatic transaxle oil pan sub–assy Remove the 18 ...

    Radio receiver assy
    Replacement Рint: components: 1. Remove floor shift shift lever knob sub–assy (m/t transaxle) 2. Remove console panel upper 3. Remove heater control knob 4. Remove instrument cluster finish panel 5. Remove instrument cluster finish panel sub–assy center Remove the 4 screws. & ...