Toyota Corolla (E120): Circuit description

Wiring diagram

Wiring diagram

Inspection procedure

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    On–vehicle inspection
    1. Inspection throttle body idle speed control valve assy Notice: it is impossible to check the resister value and the operation of isc valve by itself, because the isc valve has an ic circuit inside it, which transforms the duty signal from the ecm to the derive signal. After check ...

    How to proceed with troubleshooting
    The hand–held tester can be used at step 3, 4, 6, 9. 1 Vehicle brought to workshop 2 Customer problem analysis 3 Connect the obd ii scan tool or hand–held tester to dlc3 4 Check and clear dtc and freeze frame data 5 Visual inspection 6 Setting the check mode diagnosis 7 Proble ...

    Symptom simulation
    Hint: the most difficult case in troubleshooting is when no symptoms occurs. In such cases, a thorough customer problem analysis must be carried out. Then the same or similar conditions and environment in which the problem occurred in the customer’s vehicle should be simulated. No matter ho ...