2008 INFINITI FX35 Service Manual

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Page 1409 of 3924

INFINITI FX35 2008 Service Manual
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-169
< SERVICE INFORMATION > [VQ35DE]
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Wiring DiagramINFOID:0000000001325985
BANK 1
Specification data are reference value

Page 1410 of 3924

INFINITI FX35 2008 Service Manual
EC-170
< SERVICE INFORMATION >[VQ35DE]
DTC P0075, P0081 IVT CO
NTROL SOLENOID VALVE
Do not use ECM ground terminals when measuring in put/output voltage. Doing so may result in dam-
age to the ECMs

Page 1411 of 3924

INFINITI FX35 2008 Service Manual
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-171
< SERVICE INFORMATION > [VQ35DE]
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BANK 2
Specification data are reference values
and are measured between each termi

Page 1412 of 3924

INFINITI FX35 2008 Service Manual
EC-172
< SERVICE INFORMATION >[VQ35DE]
DTC P0075, P0081 IVT CO
NTROL SOLENOID VALVE
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis ProcedureINFOI

Page 1413 of 3924

INFINITI FX35 2008 Service Manual
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-173
< SERVICE INFORMATION > [VQ35DE]
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IPDM E/R harness connector E7
Harness for open or short between intake valve ti

DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-173
< SERVICE INFORMATION > [VQ35DE]
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IPDM E/R harness connector E7
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 ECM terminal 11 ( bank 1) or 10 (bank 2) and intake valve timing con-
trol solenoid valve terminal 1. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors F211, F10 (bank 1)
Harness for open and short between ECM and intake valve timing control solenoid valve
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to EC-152, "
Component Inspection".
OK or NG
OK >> GO TO 6.
NG >> Replace malfunctioning intake valve timing control solenoid valve.
6.CHECK INTERMITTENT INCIDENT
Refer to EC-139
.
For wiring diagram, refer to EC-320
for CKP sensor (POS), EC-325 and EC-325 for CMP sensor (PHASE).
>> INSPECTION END
Component InspectionINFOID:0000000001325987
INTAKE VALVE TIMING CONTROL SOLENOID VALVE
1. Disconnect intake valve timing control solenoid valve harness connector.
2. Check resistance between intake valve timing control solenoid
valve as follows.
If NG, replace intake valve timing control solenoid valve.
If OK, go to next step.
3. Remove intake valve timing control solenoid valve. Continuity should exist.
Terminal Resistance
1 and 2 7.0 - 7.5 Ω [at 20 °C (68 °F)]
1 or 2 and ground ∞Ω
(Continuity should not exist.)
PBIB0193E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 1414 of 3924

INFINITI FX35 2008 Service Manual
EC-174
< SERVICE INFORMATION >[VQ35DE]
DTC P0075, P0081 IVT CO
NTROL SOLENOID VALVE
4. Provide 12V DC between intake valve timing control solenoid
valve terminals and then interrupt it. Make sure tha

Page 1415 of 3924

INFINITI FX35 2008 Service Manual
DTC P0101 MAF SENSOREC-175
< SERVICE INFORMATION > [VQ35DE]
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DTC P0101 MAF SENSOR
Component DescriptionINFOID:0000000001325989
The mass air flow (MAF) sensor is placed

DTC P0101 MAF SENSOREC-175
< SERVICE INFORMATION > [VQ35DE]
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DTC P0101 MAF SENSOR
Component DescriptionINFOID:0000000001325989
The mass air flow (MAF) sensor is placed in the stream of intake air.
It measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sens
or 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 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-III Reference Val ue in Data Monitor ModeINFOID:0000000001325990
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001325991
DTC Confirmation ProcedureINFOID:0000000001325992
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 turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
PROCEDURE FOR MALFUNCTION A
NOTE:
PBIB1604E
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1 See EC-131
.
CAL/LD VALUE Engine: After warming up
Selector lever: P or N
Air conditioner switch: OFF
No load Idle 5% - 35%
2,500 rpm 5% - 35%
MASS AIRFLOW Engine: After warming up
Selector lever: P or N
Air conditioner switch: OFF
No load Idle 2.0 - 6.0 g·m/s
2,500 rpm 7.0 - 20.0 g·m/s
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0101
0101 Mass air flow sensor cir-
cuit range/performance A)
A high voltage from the sensor is sent to ECM
under light load driving condition. Harness or connectors
(Mass air flow 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 un-
der heavy load driving condition. Harness or connectors
(Mass air flow sensor circuit is
open or shorted.)
Intake air leaks
Mass air flow sensor
EVAP control system pressure sensor
Intake air temperature sensor
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 1416 of 3924

INFINITI FX35 2008 Service Manual
EC-176
< SERVICE INFORMATION >[VQ35DE]
DTC P0101 MAF SENSOR
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 idl

EC-176
< SERVICE INFORMATION >[VQ35DE]
DTC P0101 MAF SENSOR
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-178, "
Diagnosis Procedure".
PROCEDURE FOR MALFUNCTION B
CAUTION:
Always drive vehicle at a safe speed.
With CONSULT-III
1. Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to EC-178, "
Diagnosis Procedure".
2. Select “DATA MONITOR” mode with CONSULT-III.
3. Check the voltage of “MAS A/F SE-B1” with “DATA MONITOR”.
4. Increases engine speed to about 4,000 rpm.
5. Monitor the linear voltage rise in response to engine speed
increases.
If NG, go to EC-178, "
Diagnosis Procedure".
If OK, go to following step.
6. Maintain the following conditions for at least 10 consecutive sec- onds.
7. Check 1st trip DTC.
8. If 1st trip DTC is detected, go to EC-178, "
Diagnosis Procedure".
Overall Function CheckINFOID:0000000001325993
PROCEDURE FOR MALFUNCTION B
Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a 1st trip
DTC might not be confirmed.
With GST
1. Start engine and warm it up to normal operating temperature.
2. Select Service $01 with GST.
3. Check the mass air flow sensor signal with Service $01.
4. Check for linear mass air flow sensor signal value rise in response to increases to about 4,000 rpm in engine speed.
5. If NG, go to EC-178, "
Diagnosis Procedure".
ENG SPEED More than 2,000 rpm
TP SEN 1-B1 More than 3V
TP SEN 2-B1 More than 3V
Selector lever Suitable position
Driving location Driving vehicle uphill (Increased engine load) will help
maintain the driving conditions required for this test.
PBIB3457E
SEF534P
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

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