Nissan Note [1059/1872] Dtc p0420 three way catalyst function

Nissan Note [1059/1872] Dtc p0420 three way catalyst function
DTC P0420 THREE WAY CATALYST FUNCTION
EC-1059
[HR (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Diagnostic Procedure
BBS004EC
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 mass air flow sensor.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace.
4. CHECK IGNITION TIMING
Check the following items. Refer to EC-851, "
Basic Inspection" .
OK or NG
OK >> GO TO 5.
NG >> Follow the EC-851, "
Basic Inspection" .
SEC502D
Items Specifications
Target idle speed
A/T models 700 ± 50 rpm (in P or N position)
M/T models 650 ± 50 rpm (in Neutral position)
Ignition timing
A/T models 6 ± 5° BTDC (in P or N position)
M/T models 6 ± 5° BTDC (in Neutral position)

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