Toyota Corolla (E120): Horn relay circuit

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Starting system
Inspection 1. Inspect starter assy Notice: these tests must be performed within 3 to 5 seconds to prevent burnout of the coil.  perform the pull–in test.  Remove the nut, then disconnect the lead wire from terminal c. Connect the battery to the starter repai ...

Replacement
Hint: components: 1. Precaution 2. Disconnect battery negative terminal 3. Remove front door scuff plate rh 4. Remove rear door scuff plate rh 5. Remove front door opening trim rh 6. Remove rear door opening trim rh 7. Remove lap belt outer anchor cover 8. Remove center pillar garnis ...

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 ...