2009 INFINITI QX56 Factory Service Manual

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Page 1425 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-98
< COMPONENT DIAGNOSIS >[VK56DE]
P0037, P0038, P0057,
P0058 HO2S2 HEATER
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to EC-98, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0

Page 1426 of 4171

INFINITI QX56 2009 Factory Service Manual
P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-99
< COMPONENT DIAGNOSIS > [VK56DE]
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1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness conti

Page 1427 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-100
< COMPONENT DIAGNOSIS >[VK56DE]
P0075, P0081 IVT CONTROL SOLENOID VALVE
P0075, P0081 IVT CONTROL SOLENOID VALVE
Component DescriptionINFOID:0000000003771348
Intake valve timing control solenoi

Page 1428 of 4171

INFINITI QX56 2009 Factory Service Manual
P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-101
< COMPONENT DIAGNOSIS > [VK56DE]
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EC
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3. Turn ignition switch ON.
4. Check voltage between intake valve timing control soleno

P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-101
< COMPONENT DIAGNOSIS > [VK56DE]
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3. Turn ignition switch ON.
4. Check voltage between intake valve timing control solenoid
valve terminal 2 and ground with CONSULT-III or tester.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E2, F32
IPDM E/R harness connector E119
Harness for open or short between intake valve timing control solenoid valve and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.CHECK INTAKE VALVE TIMING CONTROL SOLENO ID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN
AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between the following; ECM terminal 10 and intake valve timing control solenoid valve (Bank 1) terminal 1 or
ECM terminal 11 and intake valve timing control solenoid valve (Bank 2) terminal 1.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to EC-101, "Component Inspection"
.
OK or NG
OK >> GO TO 5.
NG >> Replace malfunctioning intake valve timing control solenoid valve. Refer to EC-492
.
5.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "How to Check Terminal"
and GI-38, "Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000003771352
INTAKE VALVE TIMING CONTROL SOLENOID VALVE
1. Disconnect intake valve timing control solenoid valve harness connector.
1. Intake valve timing control position
sensor (bank 2) 2. Intake valve timing control solenoid
valve (bank 2) 3. Drive belt
4. Radiator hose 5. Intake valve timing control solenoid valve (bank 1)6. Intake valve timing control position
sensor (bank 1)
Voltage: Battery voltage
PBIB0351E
Continuity should exist.
Revision: December 20092009 QX56

Page 1429 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-102
< COMPONENT DIAGNOSIS >[VK56DE]
P0075, P0081 IVT CONTROL SOLENOID VALVE
2. Check resistance between intake valve timing control solenoid
valve terminals as follows.
If NG, replace intake valve

Page 1430 of 4171

INFINITI QX56 2009 Factory Service Manual
P0101 MAF SENSOREC-103
< COMPONENT DIAGNOSIS > [VK56DE]
C
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P0101 MAF SENSOR
Component DescriptionINFOID:0000000003771353
The mass air flow sensor is placed in
the stream

P0101 MAF SENSOREC-103
< COMPONENT DIAGNOSIS > [VK56DE]
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P0101 MAF SENSOR
Component DescriptionINFOID:0000000003771353
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 s upplied 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 Diagnosis LogicINFOID:0000000003771354
DTC Confirmation ProcedureINFOID:0000000003771355
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 conduc ted, always perform the following before conduct-
ing the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.
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.
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-105, "Diagnosis Procedure"
.
PROCEDURE FOR MALFUNCTION B
CAUTION:
Always drive vehicle at a safe speed.
With CONSULT-III
BBIA0355E
DTC No. Trouble diagnosis name DTC detecting condition Possible 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: December 20092009 QX56

Page 1431 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-104
< COMPONENT DIAGNOSIS >[VK56DE]
P0101 MAF SENSOR
1. Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to EC-105, "Diagnosis Procedure"
.
2. Select �

Page 1432 of 4171

INFINITI QX56 2009 Factory Service Manual
P0101 MAF SENSOREC-105
< COMPONENT DIAGNOSIS > [VK56DE]
C
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Diagnosis ProcedureINFOID:0000000003771357
1.INSPECTION START
Which malfunction (A or B) is duplicated?
A or B

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