Nissan Frontier D22. Manual - part 565

DTC P0122, P0123 TP SENSOR

EC-1363

[VG33ER]

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EC

2. 

CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect throttle position sensor harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between sensor terminal 3 and ground with CON-
SULT-II or tester.

OK or NG

OK

>> GO TO 3.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

3. 

CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check harness continuity between throttle position sensor terminal 1 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 the harness for open or short between ECM and throttle position sensor.

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

5. 

CHECK THROTTLE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

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.

AEC638A

Voltage: Approximately 5V

SEF630W

Continuity should exist.

Continuity should exist.

EC-1364

[VG33ER]

DTC P0122, P0123 TP SENSOR

6. 

CHECK THROTTLE POSITION SENSOR

Refer to 

EC-1366, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

ADJUST CLOSED THROTTLE POSITION SWITCH

Adjust closed throttle position switch. Refer to 

EC-1247, "Basic Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

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

EC-1247, "Basic Inspection"

 . 

8. 

CHECK MASS AIR FLOW SENSOR

Refer to 

EC-1333, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace mass air flow sensor.

Items

Specifications

Ignitions timing

10

° ± 5° BTDC

Base idle speed

700 

± 50 rpm (in P or N position)

Closed throttle position switch idle 
position adjustment

Feeler gauge thickness and switch 
condition
0.3 mm (0.012 in): ON
0.4 mm (0.016 in): OFF

Target idle speed

750 

± 50 rpm (in P or N position)

DTC P0122, P0123 TP SENSOR

EC-1365

[VG33ER]

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9. 

CHECK CAMSHAFT POSITION SENSOR

1.

Install any parts removed.

2.

Start engine.

3.

Check voltage between ECM terminals 44, 48 and ground, ECM
terminal 49 and ground with DC range.
<Terminal 44 or 48 and engine ground>

<Terminal 49 and engine ground>

OK or NG

OK

>> GO TO 10.

NG

>> Replace distributor assembly with camshaft position sensor.

10. 

CHECK FUEL INJECTOR

1.

Disconnect injector harness connector.

2.

Check resistance between terminals as shown in the figure.

OK or NG

OK

>> GO TO 11.

NG

>> Replace fuel injector.

11. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Condition

Idle

2,000 rpm

Voltage

0.3 - 0.5V

0.3 - 0.5V

Pulse sig-

nal

Condition

Idle

2,000 rpm

Voltage

Approximately 2.5V

Approximately 2.5V

Pulse sig-

nal

PBIB1424E

SEF997U

SEF998U

SEF999U

SEF001V

Resistance: 10 - 14

Ω [at 25°C (77°F)]

SEF625V

EC-1366

[VG33ER]

DTC P0122, P0123 TP SENSOR

Component Inspection

UBS00DUG

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)