Infiniti FX35 / FX45. Manual — part 361
DTC P0125 ECT SENSOR
EC-205
< SERVICE INFORMATION >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
If “COOLAN TEMP/S” increases to more than 10
°
C (50
°
F) within 65 minutes, stop engine because
the test result will be OK.
5.
Check 1st trip DTC.
6.
If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Diagnosis Procedure
INFOID:0000000001326031
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten ground screw on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-205, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace engine coolant temperature sensor.
3.
CHECK THERMOSTAT OPERATION
When the engine is cold [lower than 70
°
C (158
°
F)] condition, grasp lower radiator hose and confirm the engine
coolant does not flow.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace thermostat. Refer to
4.
CHECK INTERMITTENT INCIDENT
>> INSPECTION END
Component Inspection
INFOID:0000000001326032
ENGINE COOLANT TEMPERATURE SENSOR
PBIB2625E
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 engine coolant temperature sensor.
Removal and Installation
INFOID:0000000001326033
ENGINE COOLANT TEMPERATURE SENSOR
PBIB2005E
Engine coolant temperature
°
C (
°
F)
Resistance
k
Ω
20 (68)
2.1 - 2.9
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
SEF012P
DTC P0127 IAT SENSOR
EC-207
< SERVICE INFORMATION >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
DTC P0127 IAT SENSOR
Component Description
INFOID: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. Electrical resistance of the thermistor
decreases in response to the temperature rise.
<Reference data>
*: 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 terminals, such as the ground.
On Board Diagnosis Logic
INFOID:0000000001326035
DTC Confirmation Procedure
INFOID:0000000001326036
NOTE:
If DTC Confirmation Procedure has been previously conducted, 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
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 is detected, go to
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Diagnosis Procedure
INFOID:0000000001326037
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten ground screw on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK INTAKE AIR TEMPERATURE SENSOR
EC-208, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace mass air flow sensor (with intake air temperature sensor).
3.
CHECK INTERMITTENT INCIDENT
>> INSPECTION END
Component Inspection
INFOID:0000000001326038
INTAKE AIR TEMPERATURE SENSOR
Check resistance between intake air temperature sensor terminals 5
and 6 under the following conditions.
If NG, replace mass air flow sensor (with intake air temperature sen-
sor).
PBIB2625E
Intake air temperature
°
C (
°
F)
Resistance k
Ω
25 (77)
1.800 - 2.200
PBIB1604E
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