Nissan Note [1058/1872] Dtc p0420 three way catalyst function

Nissan Note [1058/1872] Dtc p0420 three way catalyst function
EC-1058
[HR (WITH EURO-OBD)]
DTC P0420 THREE WAY CATALYST FUNCTION
7. Make sure that the voltage switching frequency (high & low)
between ECM terminal 50 and ground is very less than that of
ECM terminal 49 and ground.
Switching frequency ratio = A/B
A: Heated oxygen sensor 2 voltage switching frequency
B: Heated oxygen sensor 1 voltage switching frequency
This ratio should be less than 0.75.
If the ratio is greater than above, it means three way catalyst
does not operate properly. Go to EC-1059, "
Diagnostic Proce-
dure" .
NOTE:
If the voltage at terminal 49 does not switch periodically more than 5
times within 10 seconds at step 7, perform trouble diagnosis for DTC P0133 first. (See EC-967, "
DTC P0133
HO2S1" .)
PBIB3000E

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