Toyota Corolla (E120): How to proceed with troubleshooting

Troubleshoot in accordance with the procedure on the following pages.

1 Vehicle brought to workshop

2 Customer problem analysis check and symptom check

2 Customer problem analysis check and symptom check

  1. Without applicable symptoms, proceed to ”a”.
  2.  with applicable symptoms, proceed to ”b”.

3 Symptom simulation

3 Symptom simulation

4 Problem symptoms table

4 Problem symptoms table

  1. Without applicable symptoms, proceed to ”a”.
  2.  with applicable symptoms, proceed to ”b”.

5 Circuit inspection and part inspection

5 Circuit inspection and part inspection

6 Perform troubleshooting in the following method, depending on

6 Perform troubleshooting in the following method, depending on malfunction symptom

  1. Terminals of ecu (seepage 05–703)
  2.  on–vehicle inspection

7 Adjustment, repair or replacement

8 Confirmation test

8 Confirmation test

End

End

Customer problem analysis check

Location

Location

Terminals of ecu

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    Circuit description
    Refer to dtc p0120 Dtc no. Dtc detection condition Trouble area P0121 The following condition is met 4 times. After the vehicle speed has exceeded 19 mph (30 km/h) once, the throttle position sensor output value is out of normal range when the throttle ...

    Replacement
    Hint: components: 1. Precaution 2. Disconnect battery negative terminal 3. Remove horn button assy Place the front wheels facing straight ahead.  using a torx socket wrench (t30), loosen the 2 torx screws until the groove along the screw circumference catches on the screw ca ...

    Inspection
    1. Inspect defogger relay (marking: def) Remove the defogger relay from the instrument panel j/b.  inspect the defogger relay. Standard: If the result is not as specified, replace the relay ...