Toyota Corolla (E120): Circuit description

The ignition switch provides circuit power and the ecm provides the circuit ground that illuminates the mil.

Mil operation is checked visually: it should be illuminated when the ignition is first turned on. If the mil is off all of the time or on all of the time, use the procedure below to troubleshoot it. The mil is used to indicate the ecm’s detection of a vehicle malfunction.

Follow this procedure using the hand–held tester or an obd ii scan tool to determine the cause of the problem and to check the mil.

Wiring diagram

Inspection procedure

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    Preparation Sst Recomended tools Ssm Equipment ...

    Replacement
    1. Remove front door scuff plate rh Using a screwdriver, remove the front door scuff plate rh. Hint: tape the screwdriver tip before use. Remove front door scuff plate lh Remove rear door scuff plate rh Using a screwdriver, remove the rear door scuff plate rh. Hint: tap ...

    Inspection procedure
    1 Check operation(overdrive) Drive the vehicle after the engine warms up.  check that overdrive on e off occurs by an operation of the o/d switch on–off. 2 Inspect terminal voltage(od) Remove the cruise control ecu assy with the connector still connected.  tur ...