Nissan Frontier D22. Manual — part 566
DTC P0125 ECT SENSOR
EC-1367
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
DTC P0125 ECT SENSOR
PFP:22630
Component Description
UBS00DUH
NOTE:
If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or
P0118. Refer to
The engine coolant temperature 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 sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.
<Reference data>
*: These data are reference values and are measured between ECM terminal 59
(Engine coolant temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than the ECM terminals, such as the ground.
On Board Diagnosis Logic
UBS00DUI
DTC Confirmation Procedure
UBS00DUJ
CAUTION:
Be careful not to overheat engine.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
WITH CONSULT-II
1.
Turn ignition switch ON.
SEF594K
Engine coolant
temperature
°C (°F)
Voltage*
(V)
Resistance
(k
Ω)
−10 (14)
4.4
9.2
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
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
EC-1368
[VG33ER]
DTC P0125 ECT SENSOR
2.
Select “DATA MONITOR” mode with CONSULT-II.
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.
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.
If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT-II”.
Diagnostic Procedure
UBS00DUK
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-1368, "Component Inspection"
OK or NG
OK
>> GO TO 2.
NG
>> Replace engine coolant temperature sensor.
2.
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 3.
NG
>> Replace thermostat. Refer to
.
3.
CHECK INTERMITTENT INCIDENT
EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END.
Component Inspection
UBS00DUL
ENGINE COOLANT TEMPERATURE SENSOR
1.
Check resistance as shown in the figure.
<Reference data>
SEF174Y
SEF152P
DTC P0125 ECT SENSOR
EC-1369
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
2.
If NG, replace engine coolant temperature sensor.
Removal and Installation
UBS00DUM
ENGINE COOLANT TEMPERATURE SENSOR
Refer to
EM-80, "OUTER COMPONENT PARTS"
.
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
EC-1370
[VG33ER]
DTC P0127 IAT SENSOR
DTC P0127 IAT SENSOR
PFP:22630
Component Description
UBS00DUN
The intake air temperature sensor is mounted to the air duct hous-
ing. 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>
*: These data are reference values and are measured between ECM terminal 61
(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 the ECM terminals, such as the ground.
On Board Diagnosis Logic
UBS00DUO
DTC Confirmation Procedure
UBS00DUP
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 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.
LEC519
Intake air
temperature
°C (°F)
Voltage*
(V)
Resistance
k
Ω
20 (68)
3.5
2.1 - 2.9
80 (176)
1.23
0.27 - 0.38
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
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