Nissan Frontier D22. Manual - part 412

DTC P0121 TP SENSOR

EC-751

[VG33E]

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EC

Component Inspection

UBS00DH0

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-752

[VG33E]

DTC P0122, P0123 TP SENSOR

DTC P0122, P0123 TP SENSOR

PFP:16119

Component Description

UBS00DH1

NOTE:
If DTC P0122, P0123 is displayed with DTC P0510, first perform the trouble diagnosis for DTC P0510.
Refer to 

EC-992

 .

The throttle position sensor responds to the accelerator pedal movement. This sensor is a kind of potentiome-
ter which transforms the throttle position into output voltage, and emits the voltage signal to the ECM. In addi-
tion, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the
ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sen-
sor. This sensor controls engine operation such as fuel cut. On the other hand, the “Wide open and closed
throttle position switch”, which is built into the throttle position sensor unit, is not used for engine control.

CONSULT-II Reference Value in Data Monitor Mode

UBS00DH2

Specification data are reference values.

On Board Diagnosis Logic

UBS00DH3

these self-diagnoses have one trip detection logic.

SEF349X

MONITOR ITEM

CONDITION

SPECIFICATION

THRTL POS SEN

●

Engine: After warming up, idle the 
engine

Throttle valve: fully closed

0.15 - 0.85V

●

Engine: After warming up

●

Ignition switch: ON
(Engine stopped)

Throttle valve: fully opened

3.5 - 4.7V

ABSOL TH·P/S

●

Engine: After warming up

●

Ignition switch: ON

●

More than -40.0 kpa (-300 mmHg, 
-11.81 inHg) of vacuum is applied 
to the throttle opener with a hand 
vacuum pump.

Throttle valve: fully closed

0.0%

●

Engine: After warming up

●

Ignition switch: ON
(Engine stopped)

Throttle valve: fully opened

Approx. 80%

DTC P0122, P0123 TP SENSOR

EC-753

[VG33E]

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EC

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

DTC Confirmation Procedure

UBS00DH4

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:

●

Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

●

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.

Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II. 

2.

Start engine and maintain the following conditions for at least 5
consecutive seconds.

3.

If DTC is detected, go to 

EC-755, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0122

Throttle position sensor 
circuit low input

An excessively low voltage from the sensor is 
sent to ECM

●

Harness or connectors
(The TP sensor circuit is open or 
shorted.)

●

TP sensor

P0123

Throttle position sensor 
circuit high input

An excessively high voltage from the sensor is 
sent to ECM

Detected items

Engine operating condition in fail-safe mode

Throttle position sensor 

circuit

Throttle position will be determined based on the injected fuel amount and the engine speed.
Therefore, acceleration will be poor.

Condition

Driving condition

When engine is idling

Normal

When accelerating

Poor acceleration

Vehicle speed

More than 5 km/h (3 MPH)

Selector lever

Suitable position except P or N (A/T), Neutral (M/T) position

SEF065Y

EC-754

[VG33E]

DTC P0122, P0123 TP SENSOR

Wiring Diagram

UBS00DH5

BBWA0473E