Nissan Frontier D40. Manual — part 360
P0125 ECT SENSOR
EC-131
< COMPONENT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
If it is below 10
°
C (50
°
F), go to following step.
4.
Start engine and run it for 65 minutes at idle speed.
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:0000000005273115
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws 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-131, "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
CO-22, "Removal and Installation Thermostat"
.
4.
CHECK INTERMITTENT INCIDENT
GI-46, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000005273116
ENGINE COOLANT TEMPERATURE SENSOR
BBIA0614E
EC-132
< COMPONENT DIAGNOSIS >
[QR25DE]
P0125 ECT 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.
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
P0127 IAT SENSOR
EC-133
< COMPONENT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
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K
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M
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EC
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P
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P0127 IAT SENSOR
Component Description
INFOID:0000000005273117
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:
Never 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:0000000005273118
DTC Confirmation Procedure
INFOID:0000000005273119
CAUTION:
Always drive vehicle at a safe speed.
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.
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 96
°
C (205
°
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 96
°
C (205
°
F), turn ignition switch OFF and cool down
engine.
• Perform the following steps before engine coolant temperature is above 96
°
C (205
°
F).
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
EC-134
< COMPONENT DIAGNOSIS >
[QR25DE]
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:0000000005273120
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two 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
EC-134, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace mass air flow sensor (with intake air temperature sensor).
3.
CHECK INTERMITTENT INCIDENT
GI-46, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000005273121
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).
BBIA0614E
Intake air temperature
°
C (
°
F)
Resistance k
Ω
25 (77)
1.800 - 2.200
PBIA9559J
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