Nissan Frontier D22. Manual - part 267

DTC P0122, P0123 TP SENSOR

EC-171

[KA24DE]

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Specification data are reference values and are measured between each terminal 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 ECM terminals, such as the ground.

Diagnostic Procedure

UBS00D3C

1. 

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch OFF.

2.

Loosen and retighten engine ground screws.

>> GO TO 2.

2. 

CHECK POWER SUPPLY

1.

Disconnect throttle position sensor harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between throttle position sensor terminal 1 and
ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 3.

NG

>> Repair harness or connectors.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

23

L

Throttle position sensor

[Ignition switch: ON]

●

Warm-up condition

●

Accelerator pedal is fully released

0.2 - 0.8V

[Ignition switch: ON]

●

Accelerator pedal is fully depressed

3.5 - 4.5V

42

BR

Sensor power supply

[Ignition switch: ON]

Approximately 5V

43

B/W

Sensor ground

[Engine is running]

●

Idle speed 

Approximately 0V

SEF325V

SEF265S

Voltage

: Approximately 5V

SEF564P

EC-172

[KA24DE]

DTC P0122, P0123 TP SENSOR

3. 

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check harness continuity between throttle position sensor terminal 3 and engine ground.
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check harness for open or short between ECM and throttle position sensor.

>> Repair open circuit or short to power in harness or connectors. 

5. 

CHECK INPUT SIGNAL CIRCUIT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminal 23 and throttle position sensor terminal 2.
Refer to Wiring Diagram.

3.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 6.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

6. 

CHECK THROTTLE POSITION SENSOR

Refer to 

EC-172, "Component Inspection"

OK or NG

OK

>> GO TO 7.

NG

>> Replace throttle position sensor. To adjust it, perform 

EC-74, "Basic Inspection"

 .

7. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Component Inspection

UBS00D3D

THROTTLE POSITION SENSOR

 With CONSULT-II

1.

Reconnect all harness connectors disconnected.

2.

Start engine and warm it up to normal operating temperature.

3.

Stop engine and turn ignition switch ON.

4.

Select “DATA MONITOR” mode with CONSULT-II.

Continuity should exist.

Continuity should exist.

DTC P0122, P0123 TP SENSOR

EC-173

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5.

Check voltage of “THRTL POS SEN” under the following condi-
tions.

NOTE:
Voltage measurement must be made with throttle position
sensor installed in vehicle.

If NG, adjust closed throttle position switch. Refer to 

EC-74,

"Basic Inspection"

 .

 With GST

1.

Reconnect all harness connectors disconnected.

2.

Start engine and warm it up to normal operating temperature.

3.

Stop engine and turn ignition switch ON.

4.

Check voltage between ECM terminal 23 (Throttle position sen-
sor signal) and ground under the following conditions.

NOTE:
Voltage measurement must be made with throttle position
sensor installed in vehicle.

If NG, adjust closed throttle position switch. Refer to 

EC-74,

"Basic Inspection"

 .

Throttle valve conditions

Voltage [V]

Completely closed

0.2 - 0.8 (a)

Partially open

Between (a) and (b)

Completely open

3.5 - 4.5 (b)

SEF179Y

Throttle valve conditions

Voltage [V]

Completely closed

0.2 - 0.8 (a)

Partially open

Between (a) and (b)

Completely open

3.5 - 4.5 (b)

SEF767W

EC-174

[KA24DE]

DTC P0125 ECT SENSOR

DTC P0125 ECT SENSOR

PFP:22630

Component Description

UBS00D3E

NOTE:
If DTC P0125 is displayed with P0117 or P0118, first perform
trouble diagnosis for DTC P0117 or P0118, 

EC-154

 .

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 ECM terminals, such as the ground.

On Board Diagnosis Logic

UBS00D3F

SEF594K

Engine coolant temperature

°C (°F)

Voltage*

V

Resistance

k

Ω

−10 (14)

4.4

7.0 - 11.4

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