intake INFINITI FX35 2008 Service Manual

EC-1026
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DTC P1140, P1145 IVT CO
NTROL POSITION SENSOR
5. Check resistance as shown below.
6. If NG, replace intake valve timing control position sensor.
Removal and InstallationINFOID:0000000001326886
INTAKE VALVE TIMING CONTROL POSITION SENSOR
Refer to EM-199.
Terminal No. (Polarity) Resistance Ω [at 25 °C (77 °F)]
3 (+) - 1 (-) Except 0 or ∞
2 (+) - 1 (-)
3 (+) - 2 (-)
PBIB0194E
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DTC P1225 TP SENSOREC-1041
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DTC P1225 TP SENSOR
Component DescriptionINFOID:0000000001326904
Electric throttle control actuator
consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has t he two sensors. These sensors are
a kind of potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi-
tion, these sensors detect t he opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
tion.
On Board Diagnosis LogicINFOID:0000000001326905
The MIL will not light up for this diagnosis.
DTC Confirmation ProcedureINFOID:0000000001326906
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
1. Turn ignition switch ON.
2. Turn ignition switch OFF, wait at least 10 seconds.
3. Turn ignition switch ON.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to EC-1041, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001326907
1.CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Turn ignition switch OFF.
2. Remove the intake air duct.
3. Check if foreign matter is c aught between the throttle valve (1)
and the housing.
- Illustration shows the view with intake air duct removed.
OK or NG
OK >> GO TO 2.
NG >> Remove the foreign matter and clean the electric throttle control actuator inside.
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. Perform EC-663, "
Throttle Valve Closed Position Learning".
3. Perform EC-663, "
Idle Air Volume Learning".
PBIB0145E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1225
1225 Closed throttle position
learning performance Closed throttle position learning value is exces-
sively low.  Electric throttle control actuator
(TP sensor 1 and 2)
PBIB3247E
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DTC P1226 TP SENSOREC-1043
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DTC P1226 TP SENSOR
Component DescriptionINFOID:0000000001326909
Electric throttle control actuator
consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has t he two sensors. These sensors are
a kind of potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi-
tion, these sensors detect t he opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
tion.
On Board Diagnosis LogicINFOID:0000000001326910
The MIL will not light up for this diagnosis.
DTC Confirmation ProcedureINFOID:0000000001326911
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
1. Turn ignition switch ON.
2. Turn ignition switch OFF, wait at least 10 seconds.
3. Turn ignition switch ON.
4. Repeat steps 2 and34 for 32 times.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to EC-1043, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001326912
1.CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Turn ignition switch OFF.
2. Remove the intake air duct.
3. Check if foreign matter is c aught between the throttle valve (1)
and the housing.
- Illustration shows the view with intake air duct removed.
OK or NG
OK >> GO TO 2.
NG >> Remove the foreign matter and clean the electric throttle control actuator inside.
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
PBIB0145E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1226
1226 Closed throttle position
learning performance Closed throttle position learning is not per-
formed successfully, repeatedly.  Electric throttle control actuator
(TP sensor 1 and 2)
PBIB3247E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

DTC P1421 COLD START CONTROLEC-1045
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DTC P1421 COLD START CONTROL
DescriptionINFOID:0000000001326914
ECM controls ignition timing and engine idle speed when engine is started with prewarming up condition.
This control promotes the activation of three way ca
talyst by heating the catalyst and reduces emissions.
On Board Diagnosis LogicINFOID:0000000001326915
DTC Confirmation ProcedureINFOID:0000000001326916
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.
 If DTC P1421 is displayed with other DTC, firs t perform the trouble diagnosis for other DTC.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-III
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT-III.
4. Check that the “COOLAN TEMP/S” indication is between 4°C (39 °F) and 36 °C (97 °F).
If “COOLAN TEMP/S” indication is within the specified value, go to the following step.
If “COOLANT TEMP/S” indication is out of the specified value, cool engine down or warm engine up and
go to step 1.
5. Start engine and let it idle for 5 minutes.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to EC-1045, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Diagnosis ProcedureINFOID:0000000001326917
1.PERFORM IDLE AIR VOLUME LEARNING
Perform EC-663, "
Idle Air Volume Learning".
Is Idle Air Volume Learning carried out successfully?
Ye s o r N o
Yes >> GO TO 2.
No >> Follow the instruction of Idle Air Volume Learning.
2.CHECK INTAKE SYSTEM
Check for the cause of intake air volume lacking. Refer to the following.
 Crushed intake air passage
 Intake air passage clogging
OK or NG
OK >> GO TO 3.
NG >> Repair or replace malfunctioning part
3.CHECK FUEL INJECTION SYSTEM FUNCTION
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1421
1421 Cold start emission reduction
strategy monitoring ECM does not control ignition timing and engine
idle speed properly when engine is started with
prewarming up condition.  Lack of intake air volume
 Fuel injection system
ECM
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EC-1080
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DTC P1800 VIAS CONT
ROL SOLENOID VALVE
DTC P1800 VIAS CONTROL SOLENOID VALVE
Component DescriptionINFOID:0000000001326961
The VIAS control solenoid valve (1) cuts the intake manifold vacuum
signal for power valve actuator. It responds to ON/OFF signals from
the ECM. When the solenoid is off, the vacuum signal from the
intake manifold is cut. When the ECM sends an ON signal the coil
pulls the plunger downward and feeds the vacuum signal to the
power valve actuator.
 Vacuum tank (2)
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001326962
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001326963
The MIL will not light up for this self-diagnosis.
DTC Confirmation ProcedureINFOID:0000000001326964
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.
TESTING CONDITION:
Before performing the following procedure, confi rm that battery voltage is between 11V at idle.
1. Start engine and let it idle for at least 5 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to EC-1082, "
Diagnosis Procedure".
PBIB3236E
MONITOR ITEM CONDITION SPECIFICATION
VIAS S/V  Selector lever: P or N
ON
 Engine speed: More than 5,000 rpm
 Selector lever: Except P or N
 Engine speed: Less than 5,000 rpm OFF
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1800
1800 VIAS control solenoid valve cir-
cuit An excessively low or high voltage signal
is sent to ECM through the valve  Harness or connectors
(The solenoid valve circuit is open or
shorted.)
 VIAS control solenoid valve
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EC-1096
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DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
NG >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors E211, M41
 Harness for open or short between ECM and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.CHECK FUSE
1. Disconnect 15A fuse.
2. Check 15A fuse for blown.
OK or NG
OK >> GO TO 9.
NG >> Replace 15A fuse.
9.CHECK INTERMITTENT INCIDENT
Refer to EC-717
.
OK or NG
OK >> Replace IPDM E/R. Refer to PG-17.
NG >> Repair or replace harness or connectors.
10.CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Turn ignition switch OFF.
2. Disconnect electric throttle control actuator (1) harness connec- tor.
3. Disconnect ECM harness connector.
4. Check harness continuity between the following terminals. Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 11.
NG >> Repair or replace.
11 .CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Remove the intake air duct.
2. Check if foreign matter is caught between the throttle valve (1) and the housing.
- Illustration shows the view with intake air duct removed.
OK or NG
OK >> GO TO 12.
NG >> Remove the foreign matter and clean the electric throttle control actuator inside.
12.CHECK THROTTLE CONTROL MOTOR
Refer to EC-1097, "
Component Inspection".
Electric throttle control
actuator terminal ECM terminal Continuity
1 5 Should exist
4 Should not exist
2 5 Should not exist
4 Should exist
PBIB3232E
PBIB3247E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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DTC P2119 ELECTRIC THROTTLE CONTROL ACTUATOREC-1103
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3. Shift selector lever to P position.
4. Start engine and let it idle for 3 seconds.
5. Check DTC.
6. If DTC is detected, go to
EC-1103, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001326999
1.CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Remove the intake air duct.
2. Check if a foreign matter is caught between the throttle valve (1) and the housing.
- Illustration shows the view with intake air duct removed.
OK or NG
OK >> GO TO 2.
NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. Perform EC-663, "
Throttle Valve Closed Position Learning".
3. Perform EC-663, "
Idle Air Volume Learning".
>> INSPECTION END
PBIB3247E
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DTC P2A00, P2A03 A/F SENSOR 1EC-1129
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DTC P2A00, P2A03 A/F SENSOR 1
Component DescriptionINFOID:0000000001327032
The air fuel ratio (A/F) sensor 1 is a planar dual-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is the combination of a
Nernst concentration cell (sensor cell) with an oxygen-pump cell,
which transports ions. It has a heater in the element.
The sensor is capable of precise m
easurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range (0.7 <
< air).
The exhaust gas components diffuse through the diffusion gap at the
electrode of the oxygen pump and Ne rnst concentration cell, where
they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygen-
pump cell so that the composition of the exhaust gas in the diffusion
gap remains constant at = 1. Ther efore, the A/F sensor 1 is able to
indicate air/fuel ratio by this pumping of current. In addition, a heater
is integrated in the sensor to ensure the required operating tempera-
ture of 700 - 800 °C (1,292 - 1,472 °F).
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000001327033
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001327034
To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored not to be
shifted to LEAN side or RICH side.
DTC Confirmation ProcedureINFOID:0000000001327035
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-III
1. Start engine and warm it up to normal operating temperature.
SEF579Z
SEF580Z
MONITOR ITEM CONDITION SPECIFICATION
A/F SEN1 (B1)
A/F SEN1 (B2)  Engine: After warming up Maintaining engine speed at 2,000 rpm Fluctuates around 1.5 V
DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
P2A00
2A00
(Bank 1) Air fuel ratio (A/F) sensor 1
circuit range/performance  The output voltage computed by ECM from the
A/F sensor 1 signal is shifted to the lean side for
a specified period.
 The A/F signal computed by ECM from the A/F sensor 1 signal is shifted to the rich side for a
specified period.  A/F sensor 1
 A/F sensor 1 heater
 Fuel pressure
 Fuel injector
 Intake air leaks
P2A03
2A03
(Bank 2)
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DTC P2A00, P2A03 A/F SENSOR 1EC-1135
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O>> GO TO 3.
3.CHECK FOR INTAKE AIR LEAK
1. Start engine and run it at idle.
2. Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace.
4.CLEAR THE SELF-LEARNING DATA
With CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING CONT” in “W ORK SUPPORT” mode with CONSULT-III.
3. Clear the self-learning control coefficient by touching “CLEAR”.
4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
Is it difficult to start engine?
Without CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor (1) harness connector.
4. Restart engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness con-
nector.
6. Make sure DTC P0102 is displayed.
7. Erase the DTC memory. Refer to EC-633, "
Emission-related
Diagnostic Information".
8. Make sure DTC P0000 is displayed.
9. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
Is it difficult to start engine?
Ye s o r N o
Yes >> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to EC-861 or EC-871.
No >> GO TO 5.
5.CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Check harness connector for water. Tightening torque: 50 N-m (5.1 kg-m, 37 ft-lb)
PBIB3230E
: Vehicle front 1. A/F sensor 1 (Bank 2)
harness connector2. A/F sensor 1 (Bank 1)
harness connector
Water should not exit.
PBIB3246E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

FUEL INJECTOREC-1149
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FUEL INJECTOR
Component DescriptionINFOID:0000000001327051
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector ci
rcuit, the coil in the fuel injec-
tor is energized. The energized coil pulls the ball valve back and
allows fuel to flow through the fuel injector into the intake manifold.
The amount of fuel injected depends upon the injection pulse dura-
tion. Pulse duration is the length of time the fuel injector remains
open. The ECM controls the injection pulse duration based on
engine fuel needs.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000001327052
Specification data are reference values.
SEF375Z
MONITOR ITEM CONDITION SPECIFICATION
B/FUEL SCHDL See EC-709
.
INJ PULSE-B1
INJ PULSE-B2  Engine: After warming up
 Selector lever: P or N
 Air conditioner switch: OFF
No load Idle 2.0 - 3.0 msec
2,000 rpm 1.9 - 2.9 msec
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