2008 INFINITI FX35 Service Manual

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Page 1689 of 3924

INFINITI FX35 2008 Service Manual
DTC P1226 TP SENSOREC-449
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DTC P1226 TP SENSOR
Component DescriptionINFOID:0000000001326304
Electric throttle control actuator
consist

DTC P1226 TP SENSOREC-449
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DTC P1226 TP SENSOR
Component DescriptionINFOID:0000000001326304
Electric throttle control actuator
consists of throttle control motor,
throttle position (TP) sensor, et c. The throttle position sensor
responds to the throttle valve movement.
The throttle position sensor has 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 addition,
these sensors detect the 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 signals and the
ECM controls the throttle control motor to make the throttle valve
opening angle properly in response to driving condition.
On Board Diagnosis LogicINFOID:0000000001326305
The MIL will not light up for this self-diagnosis.
DTC Confirmation ProcedureINFOID:0000000001326306
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 and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Repeat steps 2 and 3 for 32 times.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to EC-449, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001326307
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 and
the housing.
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-85, "
Throttle Valve Closed Position Learning".
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)
PBIB1556E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 1690 of 3924

INFINITI FX35 2008 Service Manual
EC-450
< SERVICE INFORMATION >[VQ35DE]
DTC P1226 TP SENSOR
3. Perform
EC-85, "Idle Air Volume Learning".
>> INSPECTION END
Removal and InstallationINFOID:0000000001326308
ELECTRIC THROTTLE CONTROL A

Page 1691 of 3924

INFINITI FX35 2008 Service Manual
DTC P1421 COLD START CONTROLEC-451
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DTC P1421 COLD START CONTROL
DescriptionINFOID:0000000001326309
ECM controls ignition timing and en

DTC P1421 COLD START CONTROLEC-451
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DTC P1421 COLD START CONTROL
DescriptionINFOID:0000000001326309
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:0000000001326310
DTC Confirmation ProcedureINFOID:0000000001326311
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-451, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Diagnosis ProcedureINFOID:0000000001326312
1.PERFORM IDLE AIR VOLUME LEARNING
Perform EC-85, "
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
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

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INFINITI FX35 2008 Service Manual
EC-452
< SERVICE INFORMATION >[VQ35DE]
DTC P1421 COLD START CONTROL
Perform
EC-274, "DTC Confirmation Procedure" in DTC P0171, P0174 FUEL INJECTION SYSTEM FUNC-
TION.
OK or NG
OK >> GO TO 4.
NG >> G

Page 1693 of 3924

INFINITI FX35 2008 Service Manual
DTC P1564 ICC STEERING SWITCHEC-453
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DTC P1564 ICC STEERING SWITCH
Component DescriptionINFOID:0000000001326313
ICC steering switch has

DTC P1564 ICC STEERING SWITCHEC-453
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DTC P1564 ICC STEERING SWITCH
Component DescriptionINFOID:0000000001326313
ICC steering switch has variant values of electrical
resistance for each button. ECM reads voltage variation of
switch, and determines which button is operated.
Refer to ACS-7
for the ICC function.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000001326314
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001326315
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this self-diagnosis.
NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to EC-422
.
DTC Confirmation ProcedureINFOID:0000000001326316
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.
WITH CONSULT-III
PBIB3255E
MONITOR ITEM CONDITION SPECIFICATION
MAIN SW Ignition switch: ON MAIN switch: Pressed ON
MAIN switch: Released OFF
CANCEL SW Ignition switch: ON CANCEL switch: Pressed ON
CANCEL switch: Released OFF
RESUME/ACC SW Ignition switch: ON RESUME/ACCELERATE switch: Pressed ON
RESUME/ACCELERATE switch: Released OFF
SET SW Ignition switch: ON SET/COAST switch: Pressed ON
SET/COAST switch: Released OFF
DIST SW Ignition switch: ON DISTANCE switch: Depressed ON
DISTANCE switch: Released OFF
DTC No.
Trouble Diagnosis
Name DTC Detecting Condit
ion Possible Cause
P1564
1564 ICC steering switch An excessively high voltage signal from the
ICC steering switch is sent to ECM.
ECM detects that input signal from the ICC steering switch is out of the specified range.
ECM detects that the ICC steering switch is stuck ON. Harness or connectors
(ICC steering switch circuit is open or shorted.)
ICC steering switch
ECM
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 1694 of 3924

INFINITI FX35 2008 Service Manual
EC-454
< SERVICE INFORMATION >[VQ35DE]
DTC P1564 ICC STEERING SWITCH
1. Turn ignition switch ON and wait at least 10 seconds.
2. Press MAIN switch for at least 10 seconds,
then release it and wait a

Page 1695 of 3924

INFINITI FX35 2008 Service Manual
DTC P1564 ICC STEERING SWITCHEC-455
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Wiring DiagramINFOID:0000000001326317
Specification data are reference values
and are measured be

Page 1696 of 3924

INFINITI FX35 2008 Service Manual
EC-456
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DTC P1564 ICC STEERING SWITCH
Diagnosis Procedure
INFOID:0000000001326318
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground

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