INFINITI FX35 2008 Service Manual

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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EC-1042
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DTC P1225 TP SENSOR
>>
INSPECTION END
Removal and InstallationINFOID:0000000001326908
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-175.
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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
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EC-1044
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DTC P1226 TP SENSOR
2. Perform
EC-663, "Throttle Valve Closed Position Learning".
3. Perform EC-663, "
Idle Air Volume Learning".
>> INSPECTION END
Removal and InstallationINFOID:0000000001326913
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-175.
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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-1046
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DTC P1421 COLD START CONTROL
Perform
EC-861, "DTC Confirmation Procedure" in DTC P0171, P0174 FUEL INJECTION SYSTEM FUNC-
TION.
OK or NG
OK >> GO TO 4.
NG >> Go to EC-866, "
Diagnosis Procedure".
4.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select “SELF DIAG RESULTS” mode with CONSULT-III.
3. Touch “ERASE”.
4. Perform DTC Confirmation Procedure.
See EC-1045, "
DTC Confirmation Procedure"
5. Is the 1st trip DTC P1421 displayed again?
With GST
1. Turn ignition switch ON.
2. Select Service $04 with GST.
3. Perform DTC Confirmation Procedure.
See EC-1045, "
DTC Confirmation Procedure".
4. Is the 1st trip DTC P1421 displayed again?
Ye s o r N o
Ye s > > G O T O 5 .
No >> INSPECTION END
5.REPLACE ECM
1. Replace ECM.
2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs.
Refer to BL-187, "
ECM Re-Communicating Function".
3. Perform EC-662, "
VIN Registration".
4. Perform EC-662, "
Accelerator Pedal Released Position Learning".
5. Perform EC-663, "
Throttle Valve Closed Position Learning".
6. Perform EC-663, "
Idle Air Volume Learning".
>> INSPECTION END
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DTC P1564 ICC STEERING SWITCHEC-1047
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DTC P1564 ICC STEERING SWITCH
Component DescriptionINFOID:0000000001326918
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:0000000001326919
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001326920
This self-diagnosis has the on e trip detection logic.
The MIL will not light up for this diagnosis .
NOTE:
If DTC P1564 is displayed with DTC P0605, first pe rform the trouble diagnosis for DTC P0605. Refer to
EC-1007
.
1. ICC steering switch 2. MAIN switch 3. DISTANCE switch
4. CANCEL switch 5. SET/COAST switch 6. RESUME/ACCELERATE switch
PBIB3241E
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: Re-
leased OFF
SET SW  Ignition switch: ON SET/COAST switch: Pressed ON
SET/COAST switch: Released OFF
DIST SW  Ignition switch: ON DISTANCE switch: Pressed ON
DISTANCE switch: Released OFF
DTC No.
Trouble diagnosis
name DTC detecting condition 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
(The switch circuit is open or shorted.)
 ICC steering switch
ECM
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EC-1048
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DTC P1564 ICC STEERING SWITCH
DTC Confirmation Procedure
INFOID:0000000001326921
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.
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 at least 10 seconds.
3. Press CANCEL switch for at least 10 seconds , then release it and wait at least 10 seconds.
4. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-
onds.
5. Press SET/COAST switch for at least 10 seconds , then release it and wait at least 10 seconds.
6. Press DISTANCE switch for at least 10 seconds , then release it and wait at least 10 seconds.
7. Check DTC.
8. If DTC is detected, go to EC-1050, "
Diagnosis Procedure".
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DTC P1564 ICC STEERING SWITCHEC-1049
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Wiring DiagramINFOID:0000000001326922
Specification data are reference values
and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals wh en measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground ot her than ECM terminals, such as the ground.
TBWM0724E
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EC-1050
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DTC P1564 ICC STEERING SWITCH
Diagnosis Procedure
INFOID:0000000001326923
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to EC-723, "
Ground Inspection".
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK ICC STEERING SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch ON.
2. Select “MAIN SW”, “CANCEL SW ”, “RESUME/ACC SW”, “SET SW” and “DIST SW” in “DATA MONITOR”
mode with CONSULT-III.
3. Check each item indication under the following conditions.
TER-
MI-
NAL
NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
82 B/W Sensor ground [Engine is running]

Warm-up condition
 Idle speed Approximately 0V
99 G/Y ICC steering switch [Ignition switch: ON]
 ICC steering switch: OFF
Approximately 4.3V
[Ignition switch: ON]
 MAIN switch: Pressed Approximately 0V
[Ignition switch: ON]
 CANCEL switch: Pressed Approximately 1.3V
[Ignition switch: ON]
 RESUME/ACCELERATE switch: Pressed Approximately 3.7V
[Ignition switch: ON]
 SET/COAST switch: Pressed Approximately 3V
[Ignition switch: ON]
 DISTANCE switch: Pressed Approximately 2.2V
PBIB2195E
Switch Monitor item Condition Indication
MAIN switch MAIN SW Pressed ON
Released OFF
CANCEL switch CANCEL SW Pressed ON
Released OFF
RESUME/ACCEL-
ERATE switch RESUME/ACC SW Pressed ON
Released OFF
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