Toyota Corolla (E120): Circuit description

The o/d main switch (transmission control switch) is a momentary type switch. When pressing the o/d main switch, the o/d off indicator light lights up and the ecm prohibits shifting into o/d, and when pressing it once again, the o/d off indicator light goes off and the ecm allows shifting into o/d. Turning the ig switch off will reset the o/d off indicator light.

Wiring diagram

Inspection procedure

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    Inspection procedure
    1 Inspect transmission wire(sl) Disconnect the transmission wire connector from the transaxle.  measure the resistance according to the value(s) in the table below. Standard: 2 Check harness and connector(transmission wire – ecm) Connect the transmission wire c ...

    Inspection and adjustment procedure
    1 Tire valve 2 Tire pressure gauge 1 Remove the tire valve cap. 2 Press the tip of the tire pressure gauge onto the tire valve. 3 Read the pressure using the gauge gradations. 4 If the tire inflation pressure is not at the recommended level, adjust the pressure. If you add too much air, pres ...

    General information
    There are many ecu controlled systems used in the corolla. In general, ecu controlled system are considered to be very intricate and require a high level of technical knowledge and expert skill to troubleshoot. The fact is, however, that if you proceed by inspecting the circuits one by one, ...