2008 INFINITI FX35 Service Manual

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Page 1441 of 3924

INFINITI FX35 2008 Service Manual
DTC P0122, P0123 TP SENSOREC-201
< SERVICE INFORMATION > [VQ35DE]
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1. Disconnect electric throttle c
ontrol actuator harness connector.
2. Turn ignition switch ON.
3. C

Page 1442 of 3924

INFINITI FX35 2008 Service Manual
EC-202
< SERVICE INFORMATION >[VQ35DE]
DTC P0122, P0123 TP SENSOR
>>
INSPECTION END
7.CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect EC

Page 1443 of 3924

INFINITI FX35 2008 Service Manual
DTC P0122, P0123 TP SENSOREC-203
< SERVICE INFORMATION > [VQ35DE]
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5. Check voltage between ECM terminals 50 (TP sensor 1signal),
69 (TP sensor 2signal) and body ground

Page 1444 of 3924

INFINITI FX35 2008 Service Manual
EC-204
< SERVICE INFORMATION >[VQ35DE]
DTC P0125 ECT SENSOR
DTC P0125 ECT SENSOR
Component DescriptionINFOID:0000000001326028
NOTE:
If DTC P0125 is displayed with P0117 or P0118, fi
rst perform the t

EC-204
< SERVICE INFORMATION >[VQ35DE]
DTC P0125 ECT SENSOR
DTC P0125 ECT SENSOR
Component DescriptionINFOID:0000000001326028
NOTE:
If DTC P0125 is displayed with P0117 or P0118, fi
rst perform the trouble diagnosis for DTC P0117 or
P0118. Refer to EC-193
.
The engine coolant temperature (ECT) sensor is used to detect the
engine coolant temperature. The sensor modifies a voltage signal
from the ECM. The modified signal returns to the ECM as the engine
coolant temperature input. The sens or uses a thermistor which is
sensitive to the change in temperat ure. The electrical resistance of
the thermistor decreases as temperature increases.

*: This data is reference values and is measured between ECM terminal 73 (Engine
coolant temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring in put/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.
On Board Diagnosis LogicINFOID:0000000001326029
DTC Confirmation ProcedureINFOID:0000000001326030
CAUTION:
Be careful not to overheat engine.
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
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-III.
3. Check that “COOLAN TEMP/S” is above 10 °C (50 °F).
If it is above 10 °C (50 °F), the test result will be OK.
If it is below 10 °C (50 °F), go to following step.
4. Start engine and run it for 65 minutes at idle speed.
SEF594K
Engine coolant
temperature °C ( °F) Voltage* V Resistance k
Ω
-10 (14) 4.4 7.0 - 11.4s 20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
SEF012P
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0125
0125 Insufficient engine cool-
ant temperature for
closed loop fuel control Voltage sent to ECM from the sensor is not
practical, even when some time has passed
after starting the engine.
Engine coolant temperature is insufficient for closed loop fuel control. Harness or connectors
(High resistance in the circuit)
Engine coolant temperature sensor
Thermostat
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 1445 of 3924

INFINITI FX35 2008 Service Manual
DTC P0125 ECT SENSOREC-205
< SERVICE INFORMATION > [VQ35DE]
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If “COOLAN TEMP/S” increases to more than 10
°C (50 °F) within 65 minutes, stop engine because
the te

Page 1446 of 3924

INFINITI FX35 2008 Service Manual
EC-206
< SERVICE INFORMATION >[VQ35DE]
DTC P0125 ECT SENSOR
Check resistance between engine coolant temperature sensor termi-
nals 1 and 2 as shown in the figure.
<Reference data>
If NG, replace engi

Page 1447 of 3924

INFINITI FX35 2008 Service Manual
DTC P0127 IAT SENSOREC-207
< SERVICE INFORMATION > [VQ35DE]
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DTC P0127 IAT SENSOR
Component DescriptionINFOID:0000000001326034
The intake air temperature sensor is
bui

DTC P0127 IAT SENSOREC-207
< SERVICE INFORMATION > [VQ35DE]
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DTC P0127 IAT SENSOR
Component DescriptionINFOID:0000000001326034
The intake air temperature sensor is
built into mass air flow sensor.
The sensor detects intake air temperature and transmits a signal to
the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electric al resistance of the thermistor
decreases in response to the temperature rise.

*: This data is reference values and is measured between ECM terminal 34 (Intake
air temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output
voltage. Doing so may result in damage to the ECM's transistor.
Use a ground other than ECM te rminals, such as the ground.
On Board Diagnosis LogicINFOID:0000000001326035
DTC Confirmation ProcedureINFOID:0000000001326036
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.
CAUTION:
Always drive vehicle at a safe speed.
TESTING CONDITION:
This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road
test is expected to be easier, it is unnecessary to lift the vehicle.
WITH CONSULT-III
1. Wait until engine coolant temperature is less than 90 °C (194 °F)
a. Turn ignition switch ON.
b. Select “DATA MONITOR” mode with CONSULT-III.
c. Check the engine coolant temperature.
d. If the engine coolant temperature is not less than 90 °C (194 °F), turn ignition switch OFF and cool down
engine.
Perform the following steps before engine coolant temperature is above 90 °C (194 °F).
PBIB1604E
Intake air temperature
°C ( °F) Voltage* V Resistance k
Ω
25 (77) 3.30 1.800 - 2.200
80 (176) 1.22 0.283 - 0.359
SEF012P
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0127
0127 Intake air temperature
too high Rationally incorrect voltage from the sensor is
sent to ECM, compared with the voltage signal
from engine coolant temperature sensor. Harness or connectors
(Intake air temperature sensor circuit is
open or shorted)
Intake air temperature sensor
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 1448 of 3924

INFINITI FX35 2008 Service Manual
EC-208
< SERVICE INFORMATION >[VQ35DE]
DTC P0127 IAT SENSOR
2. Start engine.
3. Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds.
4. Check 1st trip DTC.
5. If 1st trip DTC

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