2011 INFINITI QX56 air condition

EC-286
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0197, P0198 EOT SENSOR
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK ENGINE OIL TEMPERATURE SENSOR
Refer to EC-286, "
Component Inspection (Engine Oil Temperature Sensor)".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace engine oil temperature sensor. Refer to EM-54, "
Exploded View".
4.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Component Inspection (Engi ne Oil Temperature Sensor)INFOID:0000000006217834
1.CHECK ENGINE OIL TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Disconnect engine oil temperature sensor harness connector.
3. Remove engine oil temperature sensor.
4. Check resistance between engine oi l temperature sensor termi-
nals by heating with hot water as shown in the figure.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace engine oil temperature sensor. Refer to EM-54,
"Exploded View".
Terminals Condition Resistance (k Ω)
1 and 2 Temperature [ °C ( °F)] 20 (68) 2.35 - 2.73
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
JMBIA0080ZZ
Revision: 2010 May2011 QX56

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208 INJECTOR
EC-287
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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P0201, P0202, P0203, P0204, P0205,
P0206, P0207, P0208 INJECTOR
DTC LogicINFOID:0000000006217835
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
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:
Before performing the foll owing procedure, comfirm that battery voltage is 11 V or more at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Start the engine and let it idle at least 30 seconds.
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-287, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217836
1.PERFORM TROUBLE DIAGNOSIS FOR INJECTOR
Refer to EC-498, "
Component Function Check".
Is inspection result normal?
YES >> Check intermittent incident. Refer to GI-40, "Intermittent Incident".
NO >> Repair or replace error-detected parts.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0201 No.1 fuel injector circuit ECM detects No. 1 injector circuit
is open or shorted.
 The fuel injector circuit is open or shorted
 Fuel injector
ECM
P0202 No. 2 fuel injector circuit
ECM detects No. 2 injector circuit
is open or shorted.
P0203 No. 3 fuel injector circuit ECM detects No. 3 injector circuit
is open or shorted.
P0204 No. 4 fuel injector circuit ECM detects No. 4 injector circuit
is open or shorted.
P0205 No. 5 fuel injector circuit ECM detects No. 5 injector circuit
is open or shorted.
P0206 No. 6 fuel injector circuit ECM detects No. 6 injector circuit
is open or shorted.
P0207 No. 7 fuel injector circuit ECM detects No. 7 injector circuit
is open or shorted.
P0208 No. 8 fuel injector circuit ECM detects No. 8 injector circuit
is open or shorted.
Revision: 2010 May2011 QX56

EC-288
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0222, P0223 TP SENSOR
P0222, P0223 TP SENSOR
DTC LogicINFOID:0000000006217837
DTC DETECTION LOGIC
NOTE:
If DTC P0222 or P0223 is displayed with DTC P
0643, perform the trouble diagnosis for DTC P0643.
Refer to EC-381, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confi rm that battery voltage is 8 V or more at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-288, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217838
1.CHECK THROTTLE POSITION SE NSOR 1 POWER SUPPLY CIRCUIT-I
1. Disconnect electric throttle control actuator harness connector.
2. Turn ignition switch ON.
3. Check the voltage between electric throttle control actuator harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
2.CHECK THROTTLE POSITION SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between electric thro ttle control actuator and ECM harness connector.
DTC No.Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P0222 TP SEN 1/CIRC-B1
(Throttle position sensor 1
circuit low input) An excessively low voltage from the TP
sensor 1 is sent to ECM.
 Harness or connectors
(TP sensor 1 circuit is open or shorted.)
 Electric throttle control actuator (TP sensor 1)
P0223 TP SEN 1/CIRC-B1
(Throttle position sensor 1
circuit high input) An excessively high voltage from the TP
sensor 1 is sent to ECM.
Electric throttle control actuator
Ground Voltage (V)
Connector Terminal
F66 2 Ground Approx. 5
Revision: 2010 May2011 QX56

P0222, P0223 TP SENSOREC-289
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK THROTTLE POSI
TION SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between electric thro ttle control actuator and ECM harness connector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK THROTTLE POSITION SENSOR
Refer to EC-289, "
Component Inspection (Throttle Position Sensor)".
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
Replace electric throttle control actuator. Refer to EM-30, "
Removal and Installation".
>> INSPECTION END
6.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Component Inspection (T hrottle Position Sensor)INFOID:0000000006217839
1.CHECK THROTTLE POSITION SENSOR
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Perform EC-147, "
Work Procedure".
4. Turn ignition switch ON.
5. Set selector lever position to D.
6. Check the voltage between ECM harness connector terminals under the following conditions.
Electric throttle control actuator ECM Continuity
Connector Terminal Connector Terminal
F66 4 F110 97 Existed
Electric throttle control actuator ECM Continuity
Connector Terminal Connector Terminal
F66 1 F110 91 Existed
ECM Condition Voltage (V)
Connector +–
Terminal Terminal
F110 91
(TP sensor 1 signal) 97
(Sensor ground) Accelerator pedal Fully released More than 0.36
Fully depressed Less than 4.75
79
(TP sensor 2 signal) Fully released Less than 4.75
Fully depressed More than 0.36
Revision: 2010 May2011 QX56

P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE
EC-291
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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P0300, P0301, P0302, P0303, P0304,
P0305, P0306, P0307, P0308 MIS-
FIRE
DTC LogicINFOID:0000000006217840
DTC DETECTION LOGIC
When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crank-
shaft position (CKP) sensor signal to vary, ECM can determine that a misfire is occurring.
The misfire detection logic consists of the following two conditions.
1. One Trip Detection Logic (Three Way Catalyst Damage) On the 1st trip that a misfire condition occurs that can damage the three way catalyst (TWC) due to over-
heating, the MIL will blink.
When a misfire condition occurs, the ECM monitors the CKP sensor signal every 200 engine revolutions
for a change.
When the misfire condition decreases to a level t hat will not damage the TWC, the MIL will turn off.
If another misfire condition occurs that can damage the TWC on a second trip, the MIL will blink.
When the misfire condition decreases to a level t hat will not damage the TWC, the MIL will remain on.
If another misfire condition occurs that can damage the TWC, the MIL will begin to blink again.
2. Two Trip Detection Logic (Exhaust quality deterioration) For misfire conditions that will not damage the TWC (but will affect vehicle emissions), the MIL will only
light when the misfire is detected on a second trip. Du ring this condition, the ECM monitors the CKP sen-
sor signal every 1,000 engine revolutions.
A misfire malfunction can be detected in any one cylinder or in multiple cylinders.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
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.
Sensor Input signal to ECM ECM function
Crankshaft position sensor Engine speed On board diagnosis of misfire
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P0300 MULTI CYL MISFIRE
(Multiple cylinder misfires detected) Multiple cylinders misfire.
 Improper spark plug
 Insufficient compression
 Incorrect fuel pressure
 The fuel injector circuit is open or shorted
 Fuel injector
 Intake air leakage
 The ignition signal circuit is open or shorted
 Lack of fuel
 Signal plate
 A/F sensor 1
 Incorrect PCV hose connection
P0301
CYL 1 MISFIRE
(No.1 cylinder misfire detected)
No. 1 cylinder misfires.
P0302 CYL 2 MISFIRE
(No. 2 cylinder misfire detected) No. 2 cylinder misfires.
P0303 CYL 3 MISFIRE
(No. 3 cylinder misfire detected) No. 3 cylinder misfires.
P0304 CYL 4 MISFIRE
(No. 4 cylinder misfire detected)
No. 4 cylinder misfires.
P0305 CYL 5 MISFIRE
(No. 5 cylinder misfire detected) No. 5 cylinder misfires.
P0306 CYL 6 MISFIRE
(No. 6 cylinder misfire detected) No. 6 cylinder misfires.
P0307 CYL 7 MISFIRE
(No. 7 cylinder misfire detected)
No. 7 cylinder misfires.
P0308 CYL 8 MISFIRE
(No. 8 cylinder misfire detected) No. 8 cylinder misfires.
Revision: 2010 May2011 QX56

EC-292
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0300, P0301, P0302, P
0303, P0304, P0305, P0306, P0307, P0308 MISFIRE
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
1. Start engine and warm it up to 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. Restart engine and let it idle for about 15 minutes.
6. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-292, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-II
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.
4. Start engine and drive the vehicle under similar conditions to (1st trip) Freeze Frame Data for a certain
time. Refer to the table below.
Hold the accelerator pedal as steady as possible.
Similar conditions to (1st trip) Freeze Frame Data mean that the following conditions should be satisfied at
the same time.
CAUTION:
Always drive vehicle in safe manner according to tr affic conditions and obey all traffic laws when
driving.
Driving time varies according to the engine speed in the freeze frame data.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-292, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217841
1.CHECK FOR INTAKE AIR LEAKAGE AND PCV HOSE
1. Start engine and run it at idle speed.
2. Listen for the sound of the intake air leakage.
3. Check PCV hose connection.
Is intake air leakage detected?
YES >> Discover air leakage location and repair.
NO >> GO TO 2.
2.CHECK FOR EXHAUST SYSTEM CLOGGING
Engine speed Engine speed in the freeze frame data ± 400 rpm
Vehicle speed Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)
Base fuel schedule Base fuel schedule in the freeze frame data × (1 ± 0.1)
Engine coolant temperature (T)
condition When the freeze frame data shows lower than 70
°C (158 °F),
T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F),
T should be higher than or equal to 70 °C (158 °F).
Engine speed Time
Around 1,000 rpm Approximately 10 minutes
Around 2,000 rpm Approximately 5 minutes
More than 3,000 rpm Approximately 3.5 minutes
Revision: 2010 May2011 QX56

P0420, P0430 THREE WAY CATALYST FUNCTIONEC-307
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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P0420, P0430 THREE WAY CATALYST FUNCTION
DTC LogicINFOID:0000000006217851
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 decr
eases, the heated oxygen sensor 2
switching frequency will increase.
When the frequency ratio of A/F sensor 1 and heated oxygen sensor
2 approaches a specified limit value, the three way catalyst (mani-
fold) malfunction is diagnosed.
DTC CONFIRMATION PROCEDURE
1.INSPECTION START
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.
Will CONSULT-III be used?
YES >> GO TO 2.
NO >> GO TO 6.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
WITH CONSULT-III
TESTING CONDITION:
Do not maintain engine speed for mo re than the specified minutes below.
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. Select “DATA MONITOR” mode with CONSULT-III.
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-III.
11. Rev engine between 2,000 and 3,000 rpm and hold it for 3 consecutive minutes then release the acceler-
ator pedal completely.
12. Check the indication of “CATALYST”.
Which is displayed on CONSULT-III screen?
CMPLT >> GO TO 5.
INCMP >> GO TO 3.
PBIB2055E
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P0420 TW CATALYST SYS-B1
[Catalyst system efficiency
below threshold (bank 1)]
 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 leakage
 Fuel injector
 Fuel injector leakage
 Spark plug
 Improper ignition timing
P0430
TW CATALYST SYS-B2
[Catalyst system efficiency
below threshold (bank 2)]
Revision: 2010 May2011 QX56

EC-312
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0441 EVAP CONTROL SYSTEM
P0441 EVAP CONTROL SYSTEM
DTC LogicINFOID:0000000006288304
DTC DETECTION LOGIC
NOTE:
If DTC P0441 is displayed with other DTC such
as P2122, P2123, P2127, P2128 or P2138, first perform
trouble diagnosis for other DTC.
In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions.
Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP
canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP con-
trol system pressure sensor to intake manifold vacuum.
Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow
are adequate. If not, a ma lfunction is determined.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
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.
Will CONSULT-III be used?
YES >> GO TO 2.
NO >> GO TO 5.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
PBIB1026E
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P0441 EVAP PURG FLOW/MON
(EVAP control system incor-
rect purge flow) EVAP control system does not operate
properly, EVAP control system has a leak
between intake manifold and EVAP control
system pressure sensor.  EVAP canister purge volume control sole-
noid valve stuck closed
 EVAP control system pressure sensor and the circuit
 Loose, disconnected or improper connection of rubber tube
 Blocked rubber tube
 Cracked EVAP canister
 EVAP canister purge volume control sole- noid valve circuit
 Accelerator pedal position sensor
 Blocked purge port
 EVAP canister vent control valve
Revision: 2010 May2011 QX56