Nissan Murano. Manual — part 521
EC-194
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0127 IAT SENSOR
P0127 IAT SENSOR
Description
INFOID:0000000009719938
The intake air temperature sensor is built-into the mass air flow sen-
sor (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 rise in temperature.
<Reference data>
*: These data are reference values and are measured between ECM terminals 50
(Intake air temperature sensor) and 56 (Sensor ground).
DTC Logic
INFOID:0000000009719939
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
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.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.
Wait until engine coolant temperature is less than 96
°
C (205
°
F)
-
Turn ignition switch ON.
-
Select “DATA MONITOR” mode with CONSULT.
-
Check the engine coolant temperature.
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
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
P0127 IAT SENSOR
EC-195
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
-
If the engine coolant temperature is not less than 96
°
C (205
°
F), turn ignition switch OFF and cool down
engine.
NOTE:
Perform the following steps before engine coolant temperature is above 96
°
C (205
°
F).
2.
Turn ignition switch ON.
3.
Select “DATA MONITOR” mode with CONSULT.
4.
Start engine.
5.
Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds.
CAUTION:
Always drive vehicle at a safe speed.
6.
Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009719940
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection E38. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK INTAKE AIR TEMPERATURE SENSOR
EC-195, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace mass air flow sensor (with intake air temperature sensor).
3.
CHECK INTERMITTENT INCIDENT
GI-44, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009719941
1.
CHECK INTAKE AIR TEMPERATURE SENSOR
1.
Turn ignition switch OFF.
2.
Disconnect mass air flow sensor harness connector.
3.
Check resistance between mass air flow sensor terminals as per the following.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace mass air flow sensor (with intake air temperature sensor). Refer to
.
Terminal
Condition
Resistance (k
Ω
)
1 and 2
Temperature [
°
C (
°
F)]
25 (77)
1.800 - 2.200
EC-196
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0128 THERMOSTAT FUNCTION
P0128 THERMOSTAT FUNCTION
DTC Logic
INFOID:0000000009719942
DTC DETECTION LOGIC
NOTE:
If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303, P0304, P0305 or P0306, first perform
the trouble diagnosis for P0300, P0301, P0302, P0303, P0304, P0305, P0306. Refer to
Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long
enough.
This is due to a leak in the seal or the thermostat being stuck open.
DTC CONFIRMATION PROCEDURE
NOTE:
Never refuel before and during the following procedure.
1.
PRECONDITIONING-I
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PRECONDITIONING-II
With CONSULT
1.
Turn ignition switch ON.
2.
Check the following conditions:
3.
Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
4.
Check the following conditions:
Is the condition satisfied?
YES
>> GO TO 3.
NO
>> 1.
Satisfy the condition.
2.
GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT
1.
Start engine.
2.
Drive the vehicle until the following condition is satisfied.
CAUTION:
Always drive vehicle at safe speed.
-
STEP 1
DTC No.
Trouble diagnosis
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0128
THERMSTAT FNCTN
[Coolant thermostat (coolant
temperature below thermostat
regulating temperature)]
The engine coolant temperature does not
reach to specified temperature even though
the engine has run long enough.
• Thermostat
• Leakage from sealing portion of ther-
mostat
• Engine coolant temperature sensor
Ambient temperature
−
10
°
C (14
°
F) or more
A/C switch
OFF
Blower fan switch
OFF
COOLAN TEMP/S
−
10
°
C – 46
°
C (14 – 115
°
F)
P0128 THERMOSTAT FUNCTION
EC-197
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
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K
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EC
N
P
O
Drive the vehicle under the conditions instructed below until the difference between “COOLAN TEMP/S” and
“FUEL T/TMP SE” becomes at least 24
°
C (43
°
F).
*: Example
-
STEP 2
Drive the vehicle at 50 km/h (32 MPH) or more with the difference between “COOLAN TEMP/S” and “FUEL
T/TMP SE” maintained at 24
°
C (43
°
F) or more.
NOTE:
Keep the accelerator pedal as steady as possible during cruising.
-
STEP 3
Drive the vehicle at 50 km/h (32 MPH) or more until “COOLAN TEMP/S” increases by 2
°
C (4
°
F).
NOTE:
Keep the accelerator pedal as steady as possible during cruising.
Is the condition satisfied?
YES
>> GO TO 4.
NO
>> GO TO 1.
4.
PERFORM DTC CONFIRMATION PROCEDURE-II
With CONSULT
1.
Drive the vehicle until the following condition is satisfied.
CAUTION:
Always drive vehicle at safe speed.
2.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009719943
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-186, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace engine coolant temperature sensor.
2.
CHECK THERMOSTAT
Check thermostat. Refer to
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace thermostat.
Component Inspection
INFOID:0000000009719944
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
COOLAN TEMP/S
65
°
C (149
°
F) or less
FUEL T/TMP SE
Less than the value calculated by sub-
tracting 24
°
C (43
°
F) from “COOLAN
TEMP/S”.*
COOLAN TEMP/S
FUEL T/TMP SE
65
°
C (149
°
F)
41
°
C (106
°
F) or less
60
°
C (140
°
F)
36
°
C (97
°
F) or less
55
°
C (131
°
F)
31
°
C (88
°
F) or less
COOLAN TEMP/S
65
°
C (149
°
F) or more
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