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DTC P0420 THREE WAY CATALYST FUNCTION
EC-261
[QR (WITH EURO-OBD)]
C
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EC
DTC P0420 THREE WAY CATALYST FUNCTION PFP:20905
On Board Diagnosis Logic EBS010Q8
The ECM monitors the switching frequency ratio of heated oxygen
sensors 1 and 2.
A three way catalyst (manifold) with high oxygen storage capacity
will indicate a low switching frequency of heated oxygen sensor 2.
As oxygen storage capacity decreases, the heated oxygen sensor 2
switching frequency will increase.
When the frequency ratio of heated oxygen sensors 1 and 2
approaches a specified limit value, the three way catalyst (manifold)
malfunction is diagnosed.
DTC Confirmation Procedure EBS010Q9
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
TESTING CONDITION:
● Open engine hood before conducting the following procedure.
● Do not hold engine speed for more than the specified minutes below.
1. Start Engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,00 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Select “DTC & SRT CONFIRMATION” then “SRT WORK SUP-
PORT” mode with CONSULT-II.
6. Start engine.
7. Rev engine up to 2,000 to 3,000 rpm and hold it for 3 consecu-
tive minutes then release the accelerator pedal completely.
If “INCMP” of “CATALYST” changed to “COMPLT”, go to step 10
8. Wait 5 seconds at idle.
SEF484YF
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0420
0420
Catalyst system efficiency
below threshold
● Three way catalyst (manifold) does not operate
properly.
● Three way catalyst (manifold) does not have
enough oxygen storage capacity.
● Three way catalyst (manifold)
● Exhaust tube
● Intake air leaks
● Fuel injector
● Fuel injector leaks
● Spark plug
● Improper ignition timing
PBIB0566E
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