Nissan Versa Note. Manual — part 325
EC-282
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
P0420 THREE WAY CATALYST FUNCTION
P0420 THREE WAY CATALYST FUNCTION
DTC Logic
INFOID:0000000009020781
DTC DETECTION LOGIC
The ECM monitors the switching frequency ratio of air fuel ratio (A/F)
sensor 1 and heated oxygen sensor 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 air fuel ratio (A/F) sensor 1 and heated
oxygen sensor 2 approaches a specified limit value, the three way
catalyst (manifold) malfunction is diagnosed.
DTC CONFIRMATION PROCEDURE
1.
INSPECTION START
Do you have CONSULT?
Do you have CONSULT?
YES
>> GO TO 2.
NO
>> GO TO 7.
2.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Do not hold engine speed for more than the specified minutes below.
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT
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 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT.
6. Make sure that “COOLAN TEMP/S” indicates more than 70
°C (158°F).
If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches to 70
°C (158°F).
7. Open engine hood.
8. Select “DTC & SRT CONFIRMATION” then “SRT WORK SUPPORT” mode with CONSULT.
9. Rev engine up to 2,000 to 3,000 rpm and hold it for 3 consecutive minutes then release the accelerator
pedal completely.
SEF484YB
DTC No.
Trouble diagnosis content
DTC detecting condition
Possible cause
P0420
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
P0420 THREE WAY CATALYST FUNCTION
EC-283
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
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10. Check the indication of “CATALYST”.
Which is displayed on CONSULT screen?
CMPLT >> GO TO 6.
INCMP >> GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE-II
1. Wait 5 seconds at idle.
2. Rev engine up to 2,000 to 3,000 rpm and maintain it until “INCMP” of “CATALYST” changes to “CMPLT” (It
will take approximately 5 minutes).
Does the indication change to “CMPLT”?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
PERFORM DTC CONFIRMATION PROCEDURE AGAIN
1. Stop engine and cool it down to less than 70
°C (158°F).
2. Perform DTC CONFIRMATION PROCEDURE again.
>> GO TO 3.
6.
PERFORM DTC CONFIRMATION PROCEDURE-III
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
7.
PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to
EC-283, "Component Function Check"
.
NOTE:
Use component function check to check the overall function of the three way catalyst (manifold). During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Component Function Check
INFOID:0000000009020782
1.
PERFORM COMPONENT FUNCTION CHECK
Without CONSULT
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Restart engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no
load.
4. Let engine idle for 1 minute.
5. Open engine hood.
6. Check the voltage between ECM harness connector terminals under the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
ECM
Condition
Voltage (V)
Connector
+
–
Terminal
Terminal
F11
50
(HO2S2)
59
Keeping engine speed at 2500 rpm
constant under no load
The voltage fluctuation cycle takes more than 5 seconds.
• 1 cycle: 0.6 - 1.0
→ 0 - 0.3 → 0.6 - 1.0
EC-284
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
P0420 THREE WAY CATALYST FUNCTION
Diagnosis Procedure
INFOID:0000000009020783
1.
CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dent.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> 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).
Is exhaust gas leak detected?
YES
>> Repair or replace.
NO
>> GO TO 3.
3.
CHECK INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected?
YES
>> Repair or replace.
NO
>> GO TO 4.
4.
CHECK IGNITION TIMING AND IDLE SPEED
Check the following items. Refer to
.
For specification, refer to
For specification, refer to
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Follow the
.
5.
CHECK FUEL INJECTOR
1. Stop engine and then turn ignition switch ON.
2. Check the voltage between ECM harness connector and ground.
PBIB1216E
Cylinder
ECM
Voltage
No.
Front / Rear
+
−
Connector
Terminal
Connector
Terminal
1
Front
F10
31
E16
108
Battery voltage
2
30
3
29
4
25
1
Rear
12
2
20
3
16
4
24
P0420 THREE WAY CATALYST FUNCTION
EC-285
< DTC/CIRCUIT DIAGNOSIS >
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Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Perform
.
6.
CHECK FUNCTION OF IGNITION COIL-I
CAUTION:
Do the following procedure in the place where ventilation is good without the combustible.
1. Turn ignition switch OFF.
2. Remove fuel pump fuse in IPDM E/R to release fuel pressure.
NOTE:
Do not use CONSULT to release fuel pressure, or fuel pressure applies again during the following proce-
dure.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.
6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
7. Remove ignition coil and spark plug of the cylinder to be checked.
8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
9. Connect spark plug and harness connector to ignition coil.
10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -
0.66 in) between the edge of the spark plug and grounded metal
portion as shown in the figure.
11. Crank engine for about 3 seconds, and check whether spark is
generated between the spark plug and the grounded metal por-
tion.
CAUTION:
• Do not approach to the spark plug and the ignition coil
within 50 cm (19.7 in). Be careful not to get an electrical
shock while checking, because the electrical discharge
voltage becomes 20 kV or more.
• It might cause to damage the ignition coil if the gap of more than 17 mm (0.66 in) is taken.
NOTE:
When the gap is less than 13 mm (0.52 in), the spark might be generated even if the coil is mal-
functioning.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 7.
7.
CHECK FUNCTION OF IGNITION COIL-II
1. Turn ignition switch OFF.
2. Disconnect spark plug and connect a known-good spark plug.
3. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded metal portion.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Check ignition coil, power transistor and their circuits. Refer to
.
8.
CHECK SPARK PLUG
Spark should be generated.
JMBIA0066GB
Spark should be generated.
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