Nissan Note [266/1872] Ec 266

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Nissan Note [266/1872] Ec 266
EC-266
[CR (WITH EURO-OBD)]
DTC P0420 THREE WAY CATALYST FUNCTION
8. Make sure that the voltage switching frequency (high & low)
between ECM terminal 16 and ground is very less than that of
ECM terminal 35 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
(manifold) does not operate properly. Go to EC-266, "
Diagnostic
Procedure" .
NOTE:
If the voltage at terminal 35 does not switch periodically more than 5
times within 10 seconds at step 8, perform trouble diagnosis for DTC P0133 first. (See EC-189
.)
Diagnostic Procedure
BBS002YN
1. CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dent.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace.
2. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before the three way catalyst (Manifold).
OK or NG
OK >> GO TO 3.
NG >> Repair or replace.
3. CHECK INTAKE AIR LEAK
Listen for an intake air leak after the manifold absolute pressure sensor.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace.
MBIB0124E
MBIB0649E

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