Toyota Corolla (E120): Location

On–vehicle inspection

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    Emission inspection and maintenance (I/M) programs
    Some states have vehicle emission inspection programs which include OBD (On Board Diagnostics) checks. The OBD system monitors the operation of the emission control system. If the malfunction indicator lamp comes on The OBD system determines that a problem exists somewhere in the emission cont ...

    Replacement
    1. Remove instrument panel sub–assy lower 2. Remove clutch pedal spring 3. Remove clutch master cylinder push rod clevis w/hole pin Remove the clip and hole pin. 4. Remove clutch pedal support sub–assy W/ cruise control: disconnect the clutch switch assy connector. &nbs ...

    Circuit description
    The ecm compares the two waveforms of the heated oxygen sensors located before and after the catalyst to determine whether or not the catalyst performance has deteriorated. Air–fuel ratio feedback compensation keeps the waveform of the heated oxygen sensor in front of the catalyst alterna ...