Toyota Corolla (E120): Circuit description

Hint:

Hint

: there is a case that hand–held tester cannot be used when ecu is abnormal.

Wiring diagram

Inspection procedure

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    Inspection
    1. Headlamp dimmer switch assy Inspect light control switch continuity.  Measure the resistance according to the value(s) in the table below. Standard: Inspect headlight dimmer switch continuity.  Measure the resistance according to the value(s) in the tabl ...

    Mass or volume air flow circuit
    Dtc p0100 mass or volume air flow circuit Dtc p0102 mass or volume air flow circuit low input Dtc p0103 mass or volume air flow circuit high input Circuit description The maf (mass air flow) sensor measures the amount of air flowing through the throttle valve. The ecm uses this information ...

    How to proceed with troubleshooting
    The hand–held tester can be used at step 3, 4, 5, 7, 10. 1 Vehicle brought to workshop 2 Customer problem analysis 3 Connect hand–held tester to dlc3 Hint: if the display indicates a communication fault in the tool, inspect dlc3. 4 Check dtc and freeze frame data Hint: record or pr ...