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Toyota Corolla Repair Manual: Catalyst system efficiency below threshold

Toyota Corolla Repair Manual / Diagnostics / Sfi system / Catalyst system efficiency below threshold

Dtc p0420 catalyst system efficiency below threshold (bank 1)

Inspection procedure
Hint: read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is usefu ...

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. Airfuel ratio feedba ...

Other materials:

Overhaul
1. Remove console panel upper 2. Remove console box carpet 3. Remove parking brake hole cover subassy 4. Remove console box subassy rear 5. Disconnect floor shift cable transmission control shift Remove the cable end from the rod of the floor shift assembly. Using a screw ...

Confirmation driving pattern
Connect the handheld tester or the obd ii scan tool to the dlc3.  record dtcs and the freeze frame data.  set the check mode using the handheld tester .  read the value on the misfire counter for each cylinder when idling. If the value is displayed on the misfire count ...

Other functions
■ Switching between outside air and recirculated air modes Press . The mode switches between outside air mode (indicator off) and recirculated air mode (indicator on) each time is pressed. ■ Defogging the windshield Defoggers are used to defog the windshield and front side windows ...

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