Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Sfi system / Catalyst system efficiency below threshold

Toyota Corolla (E120): Catalyst system efficiency below threshold

Dtc p0420 catalyst system efficiency below threshold (bank 1)

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Inspection
1. Intake air flow meter sub–assy Inspect the intake air flow meter resistance.  Using an ohmmeter, measure the resistance between terminals tha and e2. Resistance: at –20 c (–4 f) 13.6 To 18.4 KΩ at 20 c (68 f) 2.21 To 2.69 KΩ at 60 c (140 f) 0.49 To 0.67 ...

Road test
1. Problem symptom confirmation Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms of the trouble. If the problem is that the transaxle does not shift up, shift down, or the shift point is too high or too low conduct the following road ...

Replacement
1. Work for preventing gasoline from spilling out 2. Remove engine under cover rh 3. Drain coolant 4. Remove front wheel rh 5. Remove cylinder head cover no.2 Remove the 2 nuts, 2 clips and cylinder head cover. 6. Remove air cleaner hose no.1  loosen the 2 air cleaner hose ...