Toyota Corolla (E120): 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 coil of the circuit opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates.

While the ne signal is generated (engine running), the ecm keeps tr on (circuit opening relay on) and the fuel pump also keeps operating.

Wiring diagram

Wiring diagram

Inspection procedure

    Share this page:

    Other materials:

    Gauges and meters (multi-information display)
    The displayed content may differ depending on the type of meter. 1 Tachometer Displays the engine speed in revolutions per minute. 2 Speedometer 3 Fuel gauge 4 Multi-information display The multi-information display presents the driver with a variety of drivingrelated data including the cu ...

    Ecm (1zz–fe)
    Replacement 1. Disconnect battery negative terminal 2. Remove glove compartment door assy 3. Remove ecm Remove the 2 clips using a clip remover. Then, open the cover. Disconnect the 4 ecm connectors.  remove the wire harness from the wire harness clamp. Remove the 2 ...

    Circuit description
    Refer to dtc p0130 Dtc no Dtc detection condition Trouble area P0136 The following condition (a) or (b) continues for 300 seconds or more: During driving with the engine warmed up, heated oxygen sensor o tp t does not change output change. he ...