Nissan Frontier. Manual — part 522
P0125 ECT SENSOR
EC-659
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
<Reference data>
2. If NG, replace engine coolant temperature sensor.
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
EC-660
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
P0127 IAT SENSOR
P0127 IAT SENSOR
Component Description
INFOID:0000000009481313
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 74 (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:0000000009481314
DTC Confirmation Procedure
INFOID:0000000009481315
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
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.
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
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.
c.
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
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
P0127 IAT SENSOR
EC-661
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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).
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.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT” above.
Diagnosis Procedure
INFOID:0000000009481316
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three 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-661, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace mass air flow sensor (with intake air temperature sensor). Refer to
.
3.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009481317
INTAKE AIR TEMPERATURE SENSOR
1. Check resistance between intake air temperature sensor (1) ter-
minals 5 and 6 under the following conditions.
2. If NG, replace mass air flow sensor (with intake air temperature
sensor).
Intake air temperature [
°C (°F)]
Resistance (k
Ω)
25 (77)
1.800 - 2.200
PBIA9559J
EC-662
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
P0127 IAT SENSOR
SEF012P
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