Nissan Frontier D22. Instruction — part 414
DTC P0122, P0123 TP SENSOR
EC-759
[VG33E]
C
D
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EC
Component Inspection
UBS00DH7
THROTTLE POSITION SENSOR
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Stop engine (ignition switch OFF).
3.
Turn ignition switch ON.
4.
Select “DATA MONITOR” mode with CONSULT-II.
5.
Check voltage of “THRTL POS SEN” under the following condi-
tions.
Voltage measurement must be made with throttle position
sensor installed in vehicle.
With GST
1.
Start engine and warm it up to normal operating temperature.
2.
Stop engine (ignition switch OFF).
3.
Turn ignition switch ON.
4.
Check voltage between ECM terminal 23 (Throttle position sensor signal) and ground.
Voltage measurement must be made with throttle position sensor installed in vehicle.
Throttle valve conditions
THRTL POS SEN
Completely closed (a)
0.15 - 0.85V
Partially open
Between (a) and (b)
Completely open (b)
3.5 - 4.7V
SEF719Y
Throttle valve conditions
Voltage [V]
Completely closed
0.15 - 0.85 (a)
Partially open
Between (a) and (b)
Completely open
3.5 - 4.7 (b)
EC-760
[VG33E]
DTC P0125 ECT SENSOR
DTC P0125 ECT SENSOR
PFP:22630
Component Description
UBS00DH8
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
UBS00DH9
DTC Confirmation Procedure
UBS00DHA
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
DTC P0125 ECT SENSOR
EC-761
[VG33E]
C
D
E
F
G
H
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L
M
A
EC
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
EC-761, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II”.
Diagnostic Procedure
UBS00DHB
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to
EC-761, "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
Refer to
EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
Component Inspection
UBS00DHC
ENGINE COOLANT TEMPERATURE SENSOR
1.
Check resistance as shown in the figure.
<Reference data>
SEF174Y
SEF152P
EC-762
[VG33E]
DTC P0125 ECT SENSOR
2.
If NG, replace engine coolant temperature sensor.
Removal and Installation
UBS00DHD
ENGINE COOLANT TEMPERATURE SENSOR
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
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