Nissan Frontier. Manual — part 544
P0420, P0430 THREE WAY CATALYST FUNCTION
EC-747
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
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P0420, P0430 THREE WAY CATALYST FUNCTION
On Board Diagnosis Logic
INFOID:0000000009481404
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
INFOID:0000000009481405
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
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.
WITH CONSULT
TESTING CONDITION:
Do not maintain engine speed for more than the specified minutes below.
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
7. Let engine idle for 1 minute.
8. Check 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).
9. Open engine hood.
10. Select “DTC & SRT CONFIRMATION” then “SRT WORK SUPPORT” mode with CONSULT.
11. Rev engine between 2,000 and 3,000 rpm and hold it for 3 consecutive minutes then release the acceler-
ator pedal completely.
If “INCMP” of “CATALYST” changed to “CMPLT”, go to step 12.
12. Wait 5 seconds at idle.
13. Rev engine between 2,000 and 3,000 rpm and maintain it until “INCMP” of “CATALYST” changes to
“CMPLT” (It will take approximately 5 minutes).
If not “CMPLT”, stop engine and cool it down to less than 70
°C (158°F) and then retest from step 1.
14. Select “SELF-DIAG RESULTS” mode with CONSULT.
PBIB2377E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0420
0420
(Bank 1)
Catalyst system efficien-
cy below threshold
• Three way catalyst (manifold) does not oper-
ate 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
P0430
0430
(Bank 2)
EC-748
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
P0420, P0430 THREE WAY CATALYST FUNCTION
15. Confirm that the 1st trip DTC is not detected.
If the 1st trip DTC is detected, go to
.
Overall Function Check
INFOID:0000000009481406
Use this procedure to check the overall function of the three way catalyst (manifold). During this check, a 1st
trip DTC might not be confirmed.
WITH GST
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6. Let engine idle for 1 minute.
7. Open engine hood.
8. Set voltmeter probe between ECM terminals 57 [HO2S2 (bank 1) signal], 58 [HO2S2 (bank 2) signal] and
ground.
9. Keep engine speed at 2,500 rpm constant under no load.
10. Check that the voltage does not vary for more than 5 seconds.
If the voltage fluctuation cycle takes less than 5 seconds, go to
.
• 1 cycle: 0.6 - 1.0
→ 0 - 0.3 → 0.6 - 1.0
Diagnosis Procedure
INFOID:0000000009481407
1.
CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dents.
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
PBIB1216E
P0420, P0430 THREE WAY CATALYST FUNCTION
EC-749
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
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OK or NG
OK
>> GO TO 5.
NG
>> Follow the
5.
CHECK FUEL INJECTOR
1. Stop engine and then turn ignition switch ON.
2. Check voltage between ECM terminals 33, 44, 45, 46, 47, 48 and ground with CONSULT or tester.
Refer to Wiring Diagram for FUEL INJECTOR,
.
OK or NG
OK
>> GO TO 6.
NG
>> Perform
.
6.
CHECK FUNCTION OF IGNITION COIL-I
CAUTION:
perform the following procedure in a place with no combustible objects and good ventilation.
1. Turn ignition switch OFF.
2. Remove fuel pump fuse (No.48) 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 procedure.
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 electri-
cal discharge from the ignition coils.
7. Remove ignition coil and spark plug of the cylinder to be
checked.
8. Crank engine for five 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 three seconds, and check whether spark
is generated between the spark plug and the grounded metal
portion.
CAUTION:
• Never place to the spark plug and the ignition coil within
50 cm (19.7 in) each other. Be careful not to get an electri-
cal shock while checking, because the electrical dis-
charge 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 made.
NOTE:
When the gap is less than 13 mm (0.52 in), the spark might be generated even if the coil is mal-
functioning.
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 7.
Items
Specifications
Target idle speed
625
± 50 rpm (M/T: in Neutral position), (A/T: in P or N position)
Ignition timing
15
± 5° BTDC (M/T: in Neutral position), (A/T: in P or N position)
Battery voltage should exist.
Spark should be generated.
BBIA0534E
JMBIA0066GB
EC-750
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
P0420, P0430 THREE WAY CATALYST FUNCTION
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 approximately 3 seconds, and recheck whether spark is generated between the spark
plug and the grounded metal portion.
OK or NG
OK
>> GO TO 8.
NG
>> Check that ignition coil, power transistor and their circuits. Refer to
.
8.
CHECK SPARK PLUG
Check the initial spark plug for fouling, etc.
OK or NG
OK
>> Replace spark plug(s) with standard type one(s). For
spark plug type, refer to
EM-132, "Removal and Installa-
.
NG
>> 1. Repair or clean spark plug.
2. GO TO 9.
9.
CHECK FUNCTION OF IGNITION COIL-III
1. Reconnect the initial spark plugs.
2. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug
and the grounded portion.
OK or NG
OK
>> INSPECTION END
NG
>> Replace spark plug(s) with standard type one(s). For spark plug type, refer to
.
10.
CHECK FUEL INJECTOR
1. Turn ignition switch OFF.
2. Remove fuel injector assembly.
EM-162, "Removal and Installation"
Keep fuel hose and all fuel injectors connected to fuel tube.
3. Reconnect all fuel injector harness connectors.
4. Disconnect all ignition coil harness connectors.
5. Turn ignition switch ON.
Check fuel does not drip from fuel injector.
OK or NG
OK (Does not drip.)>>GO TO 11.
NG (Drips.)>>Replace the fuel injector(s) from which fuel is dripping. Refer to
.
11.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
Trouble is fixed.>>INSPECTION END
Trouble is not fixed.>>Replace three way catalyst (manifold). Refer to
EM-147, "Removal and Installation
.
Spark should be generated.
SEF156I
Spark should be generated.
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