Nissan Frontier D22. Manual - part 265

 

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Nissan Frontier D22. Manual - part 265

 

 

DTC P0121 TP SENSOR

EC-163

[KA24DE]

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EC

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

UBS00D35

1. 

INSPECTION START

Which malfunction A or B is duplicated?

Type A or B

Type A >> GO TO 4.
Type B >> GO TO 2.

2. 

ADJUST THROTTLE POSITION SENSOR

1.

Check the following items. Refer to 

EC-74, "Basic Inspection"

 .

>> GO TO 3.

3. 

CHECK INTAKE SYSTEM

Check the following for connection.

Air duct

Air cleaner

Vacuum hoses

Intake air passage between air duct to intake manifold collector

OK or NG

OK

>> GO TO 4.

NG

>> Reconnect the parts.

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

MALFUNCTION

Type

A

A

B

B

Items

Specifications

Ignition timing

20

° ± 2° BTDC

Base idle speed

750 

± 50 rpm (in P or N position)

Closed throttle position switch idle position adjustment

Feeler gauge thickness and switch condition
0.1 mm (0.004 in): ON
0.3 mm (0.012 in): OFF

Target idle speed

800 

± 50 rpm (in P or N position)

EC-164

[KA24DE]

DTC P0121 TP SENSOR

4. 

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch OFF.

2.

Loosen and retighten engine ground screws.

>> GO TO 5.

5. 

CHECK POWER SUPPLY

1.

Disconnect throttle position sensor harness connector.

2.

Turn ignition switch ON.

3.

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

OK or NG

OK

>> GO TO 6.

NG

>> Repair harness or connectors.

6. 

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 8.

NG

>> GO TO 7.

7. 

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. 

BBIA0431E

SEF265S

Voltage

: Approximately 5V

SEF564P

Continuity should exist.

DTC P0121 TP SENSOR

EC-165

[KA24DE]

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8. 

CHECK INPUT SIGNAL CIRCUIT

1.

Disconnect ECM harness connector.

2.

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

3.

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

OK or NG

OK

>> GO TO 9.

NG

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

9. 

CHECK THROTTLE POSITION SENSOR

Refer to 

EC-166, "Component Inspection"

 .

OK or NG

OK

>> GO TO 10.

NG

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

EC-74, "Basic Inspection"

 .

10. 

CHECK MASS AIR FLOW SENSOR

Refer to 

EC-166, "Component Inspection"

 .

OK or NG

OK

>> GO TO 11.

NG

>> Replace mass air flow sensor.

11. 

CHECK CAMSHAFT POSITION SENSOR

Refer to 

EC-166, "Component Inspection"

OK or NG

OK

>> GO TO 12.

NG

>> Replace distributor assembly with camshaft position sensor.

12. 

CHECK FUEL INJECTOR

Refer to 

EC-166, "Component Inspection"

 .

OK or NG

OK

>> GO TO 13.

NG

>> Replace fuel injector.

13. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Continuity should exist.

EC-166

[KA24DE]

DTC P0121 TP SENSOR

Component Inspection

UBS00D36

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.

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"

 .

MASS AIR FLOW SENSOR

1.

Turn ignition switch ON.

2.

Start engine and warm it up to normal operating temperature.

3.

Check voltage between ECM terminal 54 (mass air flow sensor
signal) and ground.

*: Check for linear voltage rise in response to increases to about 4,000 rpm in
engine speed.

4.

If the voltage is out of specification, disconnect mass air flow sensor harness connector and connect it
again. Repeat above check.

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

Conditions

Voltage [V]

Ignition switch ON (Engine stopped)

Less than 1.0

Idle (Engine is warmed-up to normal operat-
ing temperature)

0.9 - 1.8

2,500 rpm (Engine is warmed-up to normal 
operating temperature)

1.9 - 2.3

Idle to about 4,000 rpm*

1.3 - 1.7 to Approx. 3.0

SEF326V

 

 

 

 

 

 

 

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