sensor INFINITI FX35 2008 Service Manual

DTC P1140, P1145 IVT CONTROL POSITION SENSOR
EC-1023
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis ProcedureINFOID:0000000001326884
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 INTAKE VALVE TIMING CONTROL PO SITION SENSOR POWER SUPPLY CIRCUIT
TER-
MI-
NAL
NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
53 R/L Intake valve timing control
position sensor (Bank 2) [Engine is running]

Warm-up condition
 Idle speed 0 - 1.0V
[Engine is running]
 Engine speed: 2,000 rpm 0 - 1.0V
111 W / B ECM relay
(Self shut-off) [Engine is running]
[Ignition switch: OFF]
 For a few seconds after turning ignition
switch OFF 0 - 1.5V
[Ignition switch: OFF]
 More than a few seconds after turning igni- tion switch OFF BATTERY VOLTAGE
(11 - 14V)
11 9
120 R
R/B
Power supply for ECM
[Ignition switch: ON] BATTERY VOLTAGE
(11 - 14V)
PBIB2046E
PBIB2195E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

EC-1024
< SERVICE INFORMATION >[VK45DE]
DTC P1140, P1145 IVT CO
NTROL POSITION SENSOR
1. Disconnect intake valve timing control position sensor harness connector.
2. Turn ignition switch ON.
3. Check voltage between intake valve timing control position sen-
sor terminal 3 and ground with CONSULT-III or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors E211, M41
 Harness connectors F102, M82
 Harness for open or short between intake valve timing control position sensor and IPDM E/R
 Harness for open or short between intake va lve timing control position sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK INTAKE VALVE TIMING CONTROL POSI TION SENSOR GROUND CIRCUIT FOR OPEN AND
SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between intake valve timing control position sensor terminal 1 and ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors F102, M82
 Harness for open or short between intake va lve timing control position sensor and ground
>> Repair open circuit or short to power in harness or connectors.
6.CHECK INTAKE VALVE TIMING CONTROL POSITI ON SENSOR INPUT SIGNAL CIRCUIT FOR OPEN
AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between the following;
ECM terminal 72 and intake valve timing control position sensor (Bank 1) terminal 2 or
ECM terminal 53 and intake valve timing control position sensor (Bank 2) terminal 2.Voltage: Battery voltage
PBIB1517E
SEF509Y
Continuity should exist.
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

DTC P1140, P1145 IVT CONTROL POSITION SENSOR
EC-1025
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Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
7.CHECK INTAKE VALVE TIMING CONTROL POSITION SENSOR
Refer to EC-1025, "
Component Inspection".
OK or NG
OK >> GO TO 8.
NG >> Replace malfunctioning intake valve timing control position sensor.
8.CHECK CRANKSHAFT POSI TION SENSOR (POS)
Refer to EC-910, "
Component Inspection".
OK or NG
OK >> GO TO 9.
NG >> Replace crankshaft position sensor (POS).
9.CHECK CAMSHAFT POSITI ON SENSOR (PHASE)
Refer to EC-915, "
Component Inspection".
OK or NG
OK >> GO TO 10.
NG >> Replace camshaft position sensor (PHASE).
10.CHECK CAMSHAFT SPROCKET
Check accumulation of debris to the signal pick -up portion of the camshaft sprocket. Refer to EM-199
.
OK or NG
OK >> GO TO 11.
NG >> Remove debris and clean the signal pick-up cutout of camshaft sprocket.
11 .CHECK INTERMITTENT INCIDENT
Refer to EC-717
.
>> INSPECTION END
Component InspectionINFOID:0000000001326885
INTAKE VALVE TIMING CONTROL POSITION SENSOR
1. Disconnect intake valve timing control position sensor harness connector.
2. Loosen the fixing bolt of the sensor.
3. Remove the sensor.
4. Visually check the sensor for chipping. Continuity should exist.
SEF362Z
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

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
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

DTC P1148, P1168 CLOSED LOOP CONTROL
EC-1027
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DTC P1148, P1168 CLOSED LOOP CONTROL
On Board Diagnosis LogicINFOID:0000000001326887
These self-diagnoses have the on
e trip detection logic.
NOTE:
DTC P1148 or P1168 is displayed with another DTC for A/F sensor 1.
Perform the trouble diagnosis for the corresponding DTC.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1148
11 4 8
(Bank 1) Closed loop control
function The closed loop control function for bank 1 does
not operate even when vehicle is driving in the
specified condition.
 Harness or connectors
(The A/F sensor 1 circuit is open or short-
ed.)
 A/F sensor 1
 A/F sensor 1 heater
P1168
11 6 8
(Bank 2) The closed loop control function for bank 2 does
not operate even when vehicle is driving in the
specified condition.
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

EC-1030
< SERVICE INFORMATION >[VK45DE]
DTC P1217 ENGINE
OVER TEMPERATURE
DTC P1217 ENGINE OVER TEMPERATURE
DescriptionINFOID:0000000001326896
SYSTEM DESCRIPTION
NOTE:
If DTC P1217 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-724
.
 If DTC P1217 is displayed with DTC U1010, first pe rform the trouble diagnosis for DTC U1010. Refer
to EC-726
.
Cooling Fan Control
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM through CAN communication line.
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant
pressure, and air conditioner ON signal. The contro l system has 3-step control [HIGH/MIDDLE/OFF].
Cooling Fan Operation
Cooling Fan Relay Operation
The ECM controls cooling fan relays in the IPDM E/R through CAN communication line.
Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE) Engine speed*
1
Cooling fan
controlIPDM E/R
(Cooling fan relay)
Battery
Battery voltage*
1
Wheel sensor
Vehicle speed*2
Engine coolant temperature sensor Engine coolant temperature
Air conditioner switchAir conditioner ON signal*
2
Refrigerant pressure sensor Refrigerant pressure
PBIB2560E
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EC-1032
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DTC P1217 ENGINE
OVER TEMPERATURE
2. After refilling coolant, run engine to en sure that no water-flow noise is emitted.
Overall Function CheckINFOID:0000000001326899
Use this procedure to check the overall function of the cooling fan. During this check, a DTC might not be con-
firmed.
WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pres-
sure fluid escaping from the radiator.
Wrap a thick cloth around cap. Carefully remove the cap by turning it a quarter turn to allow built-up
pressure to escape. Then turn the cap all the way off.
WITH CONSULT-III
1. Check the coolant level in the reservoir tank and radiator. Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to EC-1035,
"Diagnosis Procedure".
2. Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to EC-1035,
"Diagnosis Procedure".
3. Turn ignition switch ON.
4. Perform “COOLING FAN” in “ACTIVE TEST” mode with CON- SULT-III.
5. If the results are NG, go to EC-1035, "
Diagnosis Procedure".
WITH GST
1. Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to EC-1035,
"Diagnosis Procedure".
2. Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to EC-1035,
"Diagnosis Procedure".
3. Disconnect engine coolant temperature sensor harness connec- tor.
4. Connect 200 Ω resister to the engine coolant temperature sensor
harness connector.
5. Start engine and make sure that cooling fan operates at middle speed.
Be careful not to overheat engine.
If NG, go to EC-1035, "
Diagnosis Procedure".
If OK, go to the following step.
6. Turn ignition switch OFF.
7. Disconnect 200 Ω resister from engine coolant temperature sen-
sor harness connector.
8. Connect 150 Ω resistor to engine coolant temperature sensor
harness connector.
SEF621W
SEF621W
PBIB0965E
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EC-1036
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DTC P1217 ENGINE
OVER TEMPERATURE
OK (Without CONSULT-III)>>GO TO 4.
NG >> Check cooling fan (crankshaft driven). Refer to CO-48
.
2.CHECK COOLING FAN MIDDLE SPEED OPERATION
With CONSULT-III
1. Start engine and let it idle.
2. Select “COOLING FAN” in “ACTIVE TEST” mode wit h CONSULT-III, and touch “MID” on the CONSULT-III
screen.
3. Make sure that cooling fan operates.
OK or NG
OK >> GO TO 3.
NG >> Check cooling fan middle speed cont rol circuit. (Go to "PROCEDURE A".)
3.CHECK COOLING FAN HIGH SPEED OPERATION
With CONSULT-III
1. Select “COOLING FAN” in “A CTIVE TEST” mode with CONSULT-III and touch “HI” on the CONSULT-III
screen.
2. Make sure that cooling fan operates at higher speed than middle speed.
OK or NG
OK >> GO TO 6.
NG >> Check cooling fan high speed control circuit. (Go to "PROCEDURE B".)
4.CHECK COOLING FAN MIDDLE SPEED OPERATION
Without CONSULT-III
1. Disconnect engine coolant temperature sensor harness connector.
2. Connect 200 Ω resistor to engine coolant tem perature sensor harness connector.
3. Start engine and let it idle.
4. Make sure that cooling fan operates.
OK or NG
OK >> GO TO 5.
NG >> Check cooling fan middle speed control circuit. (Go to "PROCEDURE A".)
5.CHECK COOLING FAN HIGH SPEED OPERATION
Without CONSULT-III
1. Disconnect 200 Ω resister to the engine coolant te mperature sensor harness connector.
2. Connect 150 Ω resistor to engine coolant tem perature sensor harness connector.
3. Start engine and let it idle.
4. Make sure that cooling fan operates at higher speed than middle speed.
OK or NG
OK >> GO TO 6.
NG >> Check cooling fan control circuit. (Go to "PROCEDURE B".)
6.CHECK COOLING SYSTEM FOR LEAK
PBIB0965E
SEF882V
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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DTC P1217 ENGINE OVER TEMPERATUREEC-1037
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Apply pressure to the cooling sys
tem with a tester, and check if the
pressure drops.
CAUTION:
Higher than the specified pressu re may cause radiator damage.
Pressure should not drop.
OK or NG
OK >> GO TO 7.
NG >> Check the following for leak. Refer to CO-37, "
Inspec-
tion".
Hose
 Radiator
 Water pump
7.CHECK RADIATOR CAP
Apply pressure to cap with a tester.
OK or NG
OK >> GO TO 8.
NG >> Replace radiator cap.
8.CHECK COMPONENT PARTS
Check the following.
 Thermostat. (Refer to CO-52
.)
 Water control valve. (Refer to CO-52
.)
 Engine coolant temperature sensor. (Refer to EC-783, "
Component Inspection".)
OK or NG
OK >> GO TO 9.
NG >> Replace malfunctioning component.
9.CHECK MAIN 13 CAUSES
If the cause cannot be isolated, go to EC-1039, "
Main 13 Causes of Overheating".
>> INSPECTION END
PROCEDURE A
1.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E6.
3. Check voltage between IPDM E/R terminal 16 and ground with CONSULT-III or tester.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2. Testing pressure: 157 kPa (1.6 kg/cm
2, 23 psi)
PBIC1528E
Radiator cap
relief pressure:
59 - 98 kPa (0.6 - 1.0 kg/cm2, 9 - 14 psi)
SLC755A
Voltage: Battery voltage
PBIB0966E
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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
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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