Infiniti M35/M45 Y50. Manual — part 617
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DTC P0125 ECT SENSOR
EC-941
[VK45DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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
CO-55, "THERMOSTAT AND WATER CONTROL VALVE"
4.
CHECK INTERMITTENT INCIDENT
Refer to
EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
Refer to
>> INSPECTION END
Component Inspection
NBS005DC
ENGINE COOLANT TEMPERATURE SENSOR
1.
Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.
<Reference data>
2.
If NG, replace engine coolant temperature sensor.
Removal and Installation
NBS005DD
ENGINE COOLANT TEMPERATURE SENSOR
Refer to
CO-55, "THERMOSTAT AND WATER CONTROL VALVE"
.
PBIB2005E
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
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EC-942
[VK45DE]
DTC P0127 IAT SENSOR
DTC P0127 IAT SENSOR
PFP:22630
Component Description
NBS005DE
The intake air temperature sensor is built-into mass air flow sensor
(1). 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 value 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
NBS005DF
DTC Confirmation Procedure
NBS005DG
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-II
1.
Wait until engine coolant temperature is less than 90
°
C (194
°
F)
a.
Turn ignition switch ON.
PBIA9559J
Intake air temperature
°
C (
°
F)
Voltage*
V
Resistance
k
Ω
25 (77)
3.3
1.800 - 2.200
80 (176)
1.2
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
(The sensor circuit is open or shorted)
●
Intake air temperature sensor
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DTC P0127 IAT SENSOR
EC-943
[VK45DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
b.
Select “DATA MONITOR” mode with CONSULT-II.
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 tempera-
ture is above 90
°
C (194
°
F).
2.
Turn ignition switch ON.
3.
Select “DATA MONITOR” mode with CONSULT-II.
4.
Start engine.
5.
Hold vehicle speed at more than 70 km/h (43 MPH) for 100 con-
secutive seconds.
6.
If 1st trip DTC is detected, go to
EC-943, "Diagnostic Procedure"
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic Procedure
NBS005DH
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to
EC-944, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace mass air flow sensor (with intake air temperature sensor).
3.
CHECK INTERMITTENT INCIDENT
Refer to
EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
Refer to
>> INSPECTION END
SEF189Y
1.
Body ground M70
2.
Body ground M16
PBIB2782E
![](/vehicles/zatt/cen/houeebante/sex.png)
EC-944
[VK45DE]
DTC P0127 IAT SENSOR
Component Inspection
NBS005DI
INTAKE AIR TEMPERATURE SENSOR
1.
Check resistance between mass air flow sensor (1) terminals 5
and 6 under the following conditions.
2.
If NG, replace mass air flow sensor (with intake air temperature
sensor).
Removal and Installation
NBS005DJ
MASS AIR FLOW SENSOR
Refer to
EM-177, "AIR CLEANER AND AIR DUCT"
Intake air temperature
°
C (
°
F)
Resistance k
Ω
25 (77)
1.800 - 2.200
PBIA9559J
SEF012P
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