2007 INFINITI QX56 Factory Service Manual

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Page 1265 of 3061

INFINITI QX56 2007 Factory Service Manual EC-182
< SERVICE INFORMATION >
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis ProcedureINFOID:00000000

Page 1266 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-183
< SERVICE INFORMATION >
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EC
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4. Check voltage between intake valve timing control solenoid
valve terminal 2 and ground wit

Page 1267 of 3061

INFINITI QX56 2007 Factory Service Manual EC-184
< SERVICE INFORMATION >
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
2. Check resistance between intake valve timing control solenoid
valve terminals as follows.
If NG, replace intake valve timi

Page 1268 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-185
< SERVICE INFORMATION >
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2. Disconnect intake valve timing control solenoid valve (bank 1) connector.
3. Remove intake

Page 1269 of 3061

INFINITI QX56 2007 Factory Service Manual EC-186
< SERVICE INFORMATION >
DTC P0101 MAF SENSOR
DTC P0101 MAF SENSOR
Component DescriptionINFOID:0000000003531680
The mass air flow sensor is placed in the stream of intake air. It mea-
sures the

EC-186
< SERVICE INFORMATION >
DTC P0101 MAF SENSOR
DTC P0101 MAF SENSOR
Component DescriptionINFOID:0000000003531680
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 controls 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.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000003531681
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000003531682
DTC Confirmation ProcedureINFOID:0000000003531683
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:
BBIA0355E
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1 See EC-129
.
CAL/LD VALUE• Engine: After warming up
• Air conditioner switch: OFF
• Selector lever: P or N
•No loadIdle 14% - 33%
2,500 rpm 12% - 25%
MASS AIRFLOW• Engine: After warming up
• Air conditioner switch: OFF
• Selector lever: P or N
•No loadIdle 3.0 - 9.0 g·m/s
2,500 rpm 9.0 - 28.0 g·m/s
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0101
0101Mass air flow sensor circuit
range/performanceA)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

Page 1270 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0101 MAF SENSOR
EC-187
< SERVICE INFORMATION >
C
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EC
N
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If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead
of

Page 1271 of 3061

INFINITI QX56 2007 Factory Service Manual EC-188
< SERVICE INFORMATION >
DTC P0101 MAF SENSOR
7. Maintain the following conditions for at least 10 consecutive sec-
onds.
8. If 1st trip DTC is detected, go to EC-190, "
Diagnosis Procedure".
Ov

Page 1272 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0101 MAF SENSOR
EC-189
< SERVICE INFORMATION >
C
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EC
N
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Wiring DiagramINFOID:0000000003531685
Specification data are reference values and are measured between each terminal

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