2008 INFINITI QX56 Factory Service Manual

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Page 1401 of 4083

INFINITI QX56 2008 Factory Service Manual EC-102
< COMPONENT DIAGNOSIS >[VK56DE]
P0037, P0038, P0057,
P0058 HO2S2 HEATER
4.CHECK HO2S2 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness con

Page 1402 of 4083

INFINITI QX56 2008 Factory Service Manual P0075, P0081 IVT CONTROL SOLENOID VALVEEC-103
< COMPONENT DIAGNOSIS > [VK56DE]
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P0075, P0081 IVT CONTROL SOLENOID VALVE
Component DescriptionINFOID:0000000001351393
Inta

Page 1403 of 4083

INFINITI QX56 2008 Factory Service Manual EC-104
< COMPONENT DIAGNOSIS >[VK56DE]
P0075, P0081 IVT CONTROL SOLENOID VALVE
3. Turn ignition switch ON.
4. Check voltage between intake valve timing control solenoid
valve terminal 2 and ground wit

Page 1404 of 4083

INFINITI QX56 2008 Factory Service Manual P0075, P0081 IVT CONTROL SOLENOID VALVEEC-105
< COMPONENT DIAGNOSIS > [VK56DE]
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2. Check resistance between intake valve timing control solenoid
valve terminals as follo

Page 1405 of 4083

INFINITI QX56 2008 Factory Service Manual EC-106
< COMPONENT DIAGNOSIS >[VK56DE]
P0101 MAF SENSOR
P0101 MAF SENSOR
Component DescriptionINFOID:0000000001351401
The mass air flow sensor is placed in the stream of intake air. It mea-
sures the

EC-106
< COMPONENT DIAGNOSIS >[VK56DE]
P0101 MAF SENSOR
P0101 MAF SENSOR
Component DescriptionINFOID:0000000001351401
The mass air flow sensor is placed in the stream of intake air. It mea-
sures the intake flow rate by measuring a part of the entire intake
flow. The mass air flow sensor c
ontrols the temperature of the hot
wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to the hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
On Board Diagn osis LogicINFOID:0000000001351403
DTC Confirmation ProcedureINFOID:0000000001351404
Perform PROCEDURE FOR MALFUNCTION A first.
If the DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
PROCEDURE FOR MALFUNCTION A
NOTE:
If engine will not start or stops soon, wait at leas t 10 seconds with engine stopped (Ignition switch ON) instead
of running engine at idle speed.
With CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Run engine for at least 10 seconds at idle speed.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to EC-109, "
Diagnosis Procedure".
With GST
Follow the procedure “With CONSULT-III” above.
PROCEDURE FOR MALFUNCTION B
NOTE:
Check vehicle specifications and VIN, then select the procedure to be performed. (Refer to the table below.)
BBIA0355E
DTC No. Trouble diagnosis name DTC detecting conditionPossible cause
P0101
0101 Mass air flow sensor circuit
range/performance A)
A high voltage from the sensor is sent to ECM
under light load driving condition. • Harness or connectors
(The sensor circuit is open or
shorted.)
• Mass air flow sensor
• EVAP control system pressure sensor
• Intake air temperature sensor
B) A low voltage from the sensor is sent to ECM
under heavy load driving condition. • Harness or connectors
(The sensor circuit is open or
shorted.)
• Intake air leaks
• Mass air flow sensor
• EVAP control system pressure sensor
• Intake air temperature sensor
Revision: March 2010 2008 QX56

Page 1406 of 4083

INFINITI QX56 2008 Factory Service Manual P0101 MAF SENSOREC-107
< COMPONENT DIAGNOSIS > [VK56DE]
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Procedure for Malfunction B-a
WITH CONSULT-III
1. Start engine and warm it up to normal operating temperature.

Page 1407 of 4083

INFINITI QX56 2008 Factory Service Manual EC-108
< COMPONENT DIAGNOSIS >[VK56DE]
P0101 MAF SENSOR
If engine cannot be started, go to
EC-109, "Diagnosis Procedure".
2. Select “DATA MONITOR” mode with CONSULT-III.
3. Check the voltage of �

Page 1408 of 4083

INFINITI QX56 2008 Factory Service Manual P0101 MAF SENSOREC-109
< COMPONENT DIAGNOSIS > [VK56DE]
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Diagnosis ProcedureINFOID:0000000001351407
1.INSPECTION START
Which malfunction (A or B) is duplicated?
A or B
A

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