Nissan Frontier D22. Manual - part 266

DTC P0121 TP SENSOR

EC-167

[KA24DE]

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EC

5.

If NG, remove mass air flow sensor from air duct. Check hot wire
for damage or dust.

FUEL INJECTOR

1.

Disconnect injector harness connector.

2.

Check resistance between terminals as shown in the figure.

SEF893J

Resistance

: 7.3 - 9.9

Ω [at 25°C (77°F)]

SEF273W

EC-168

[KA24DE]

DTC P0122, P0123 TP SENSOR

DTC P0122, P0123 TP SENSOR

PFP:16119

Component Description

UBS00D37

NOTE:
If DTC, P0122 or P0123 is displayed with DTC P0510, first perform trouble diagnosis for DTC P0510,

EC-407

 .

The throttle position sensor responds to the accelerator pedal movement. This sensor is a type 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

UBS00D38

Specification data are reference values.

On Board Diagnosis Logic

UBS00D39

These self-diagnoses have the one trip detection logic.

SEF105S

MONITOR ITEM

CONDITION

SPECIFICATION

THRTL POS SEN

●

Ignition switch: ON
(Engine stopped)

●

Engine: After warming up

Throttle valve: Fully closed

0.2 - 0.8V

Throttle valve: Fully opened

3.5 - 4.5V

ABSOL TH·P/S

●

Ignition switch: ON
(Engine stopped)

●

Engine: After warming up

Throttle valve: Fully closed

0.0%

Throttle valve: Fully opened

Approx. 80%

DTC No.

Trouble diagnosis name

DTC Detecting Condition

Check Items (Possible Cause)

P0122

Throttle position sensor 
circuit low input

An excessively low voltage from the sensor is 
sent to ECM.

●

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

●

Throttle position sensor

P0123

Throttle position sensor 
circuit high input

An excessively high voltage from the sensor is 
sent to ECM.

DTC P0122, P0123 TP SENSOR

EC-169

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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

UBS00D3A

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

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.

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-171, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

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

VHCL SPEED SE

More than 4 km/h (2 MPH)

Selector lever

Suitable position except P or N position

SEF065Y

EC-170

[KA24DE]

DTC P0122, P0123 TP SENSOR

Wiring Diagram

UBS00D3B

BBWA0547E