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 terminal voltage(idl) Remove the cruise control ecu assy with connector still connected.  disconnect the ecm connector.  turn the ignition switch to on.  measure voltage between terminal 13 (idl) of cruise control ecu assy connector and body ground when the ...

    Inspection procedure
    Hint: hand–held tester only: narrowing down the trouble area is possible by performing ”a/f control” active test (heated oxygen sensor or other trouble areas can be distinguished).  perform active test using hand–held tester (a/f control). Hint: ”a/f control” is the act ...

    Inspection procedure
    1 Inspect dlc3 terminal voltage(tc terminal) Turn the ignition switch to on.  measure voltage between terminals tc and cg of dlc3. Ok: voltage: 10 – 14 v 2 Check harness and connector(dlc3 – body ground) Check for open and short circuit in harness and connector betw ...