2011 INFINITI QX56 Factory Service Manual

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Page 2233 of 5598

INFINITI QX56 2011 Factory Service Manual
P0106 MANIFOLD ABSOLUTE PRESSURE SENSOREC-209
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Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace MAP sensor.
2.CHECK MAP

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INFINITI QX56 2011 Factory Service Manual
EC-210
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P010A MANIFOLD ABSOL
UTE PRESSURE SENSOR
P010A MANIFOLD ABSOLUTE PRESSURE SENSOR
DTC LogicINFOID:0000000006217792
DTC DETECTION LOGIC
NOTE:
If DTC P010A is di

EC-210
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P010A MANIFOLD ABSOL
UTE PRESSURE SENSOR
P010A MANIFOLD ABSOLUTE PRESSURE SENSOR
DTC LogicINFOID:0000000006217792
DTC DETECTION LOGIC
NOTE:
If DTC P010A is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to EC-381, "
DTC 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.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 10 seconds.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-210, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217793
1.CHECK MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR POWER SUPPLY CIRCUIT
1. Disconnect manifold absolute pressu re (MAP) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between manifold absolute pr essure (MAP) sensor 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 MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR GROUND CIRCUIT FOR OPEN AND
SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between manifold absolute pressure (MAP) sensor harness connector and ECM har-
ness connector.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P010A ABSL PRES SEN/CIRC
[Manifold absolute pressure (MAP)
sensor circuit] An excessively low voltage from
the sensor is sent to ECM.
An excessively high voltage from the sensor is sent to ECM. Harness or connectors
(Manifold absolute pressure sen-
sor circuit is shorted.)
Manifold absolute pressure sensor
Manifold absolute pressure (MAP) sensor Ground Voltage (V)
Connector Terminal
F65 1 Ground Approx. 5
Manifold absolute pressure (MAP) sensor ECM Continuity
Connector Terminal Connector Terminal
F65 3 F110 70 Existed
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
P010A MANIFOLD ABSOLUTE PRESSURE SENSOREC-211
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4. Also check harness for short to ground and short to power.
Is the inspection result

P010A MANIFOLD ABSOLUTE PRESSURE SENSOREC-211
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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 MANIFOLD ABSOLUTE PRESSURE (MAP) SE
NSOR INPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT
1. Check the continuity between manifold absolute pressure (MAP) sensor harness connector and ECM har-
ness 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 MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
Refer to EC-211, "
Component Inspection (MAP Sensor)".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace manifold absolute pressure (MAP) sensor. Refer to EM-30, "
Exploded View".
5.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Component Inspection (MAP Sensor)INFOID:0000000006288358
1.CHECK MAP SENSOR-I
1. Turn ignition switch OFF.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF, wait at least 5 seconds and then turn ON.
4. Check the voltage between ECM harness connector terminals as follows.
NOTE:
To avoid the influence of intake manifold vacuum, check the voltage 1 or more minutes past after engineis stopped.
Because the sensor is absolute pressure sens or, output value may differ depending on atmospheric
pressure and altitude.
5. Measure the atmospheric pressure. NOTE:
As the atmospheric pressure described on the synoptic chart is the value at sea level, compensate the
pressure with the following chart.
Manifold absolute pressure (MAP) sensor ECM Continuity
Connector Terminal Connector Terminal
F65 2 F110 67 Existed
ECM
+–
Connector Terminal Connector Terminal F110 67 F110 70
Altitude (m) Compensated pressure (hPa)00
200 -24
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
EC-212
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P010A MANIFOLD ABSOL
UTE PRESSURE SENSOR
6. Check the manifold absolute pressure sensor value corresponding to the atmospheric pressure.
Is the inspection re

Page 2237 of 5598

INFINITI QX56 2011 Factory Service Manual
P0112, P0113 IAT SENSOREC-213
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P0112, P0113 IAT SENSOR
DTC LogicINFOID:0000000006217795
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDUR

P0112, P0113 IAT SENSOREC-213
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P0112, P0113 IAT SENSOR
DTC LogicINFOID:0000000006217795
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.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-213, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217796
1.CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow (MAF) sensor (intake air temperature sensor is built-in) harness connector.
2. Turn ignition switch ON.
3. Check the voltage between MAF sensor 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 INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between MAF sensor harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P0112 IAT SEN/CIRCUIT-B1
(Intake air temperature sensor
circuit low input) An excessively low voltage from the sensor
is sent to ECM.
Harness or connectors
(The intake air temperature sensor cir-
cuit is open or shorted.)
Intake air temperature sensor
P0113 IAT SEN/CIRCUIT-B1
(Intake air temperature sensor
circuit high input) An excessively high voltage from the sensor
is sent to ECM.
MAF sensor
Ground Voltage (V)
Connector Terminal
F31 2 Ground Approx. 5
MAF sensor ECM Continuity
Connector Terminal Connector Terminal
F 3 1 1 F 111 2 5 E x i s t e d
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
EC-214
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0112, P0113 IAT SENSOR
YES >> GO TO 3.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK INTAKE AIR TEMPERATURE

Page 2239 of 5598

INFINITI QX56 2011 Factory Service Manual
P0116 ECT SENSOREC-215
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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P0116 ECT SENSOR
DTC LogicINFOID:0000000006288277
DTC DETECTION LOGIC
NOTE:
If DTC P0116 is displayed with P0

P0116 ECT SENSOREC-215
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P0116 ECT SENSOR
DTC LogicINFOID:0000000006288277
DTC DETECTION LOGIC
NOTE:
If DTC P0116 is displayed with P0117 or P0118,
first perform the trouble diagnosis for DTC P0117,
P0118. Refer to EC-217, "
DTC 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.
TEST CONDITION:
Before performing the following procedure, do not add fuel.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and warm it up to normal operating temperature.
2. Rev engine up to 2,000 rpm for more than 10 minutes.
3. Move the vehicle to a cool place, then stop engine.
4. Check resistance between “fuel level s ensor unit and fuel pump” terminals 4 and 5.
5. Soak the vehicle until the resistance between “fuel level sensor unit and fuel pump” terminals 4 and 5
becomes 0.5 k Ω higher than the value measured before soaking.
CAUTION:
Never turn ignition sw itch ON during soaking.
NOTE:
Soak time changes depending on ambient ai r temperature. It may take several hours.
6. Start engine and let it idle for 20 minutes.
7. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-215, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006288278
1.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-216, "
Component Inspection (Engine Coolant Temperature Sensor)".
Is the inspection result normal?
OK >> GO TO 2.
NG >> Replace engine coolant temperature sensor. Refer to EM-86, "
Exploded View".
2.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P0116 ECT SEN/CIRC
(Engine coolant tempera-
ture sensor circuit range/
performance) Engine coolant temperature signal from engine
coolant temperature sensor does not fluctuate,
even when some time has passed after starting
the engine with pre-warming up condition.
Harness or connectors
(High or low resistance in the circuit)
Engine coolant temperature sensor
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
EC-216
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0116 ECT SENSOR
Component Inspection (Engine Coolant Temperature Sensor)
INFOID:0000000006288609
1.CHECK ENGINE COOLANT TEMPERATURE SENSOR
1. Turn ignition

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