Nissan Frontier D22. Manual — part 411
DTC P0121 TP SENSOR
EC-747
[VG33E]
C
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F
G
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M
A
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 the ECM terminals, such as the ground.
Diagnostic Procedure
UBS00DGZ
1.
INSPECTION START
Which malfunction (A or B) is duplicated?
A or B
A
>> GO TO 4.
B
>> GO TO 2.
2.
ADJUST THROTTLE POSITION SENSOR
Check the following items. Refer to
>> GO TO 3.
3.
CHECK INTAKE SYSTEM.
1.
Turn ignition switch OFF.
2.
Check the following for connection.
–
Air duct
–
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
[Engine is running]
●
Warm-up condition
●
More than -40.0 kpa (-300 mmHg, -11.81 inHg)
of vacuum is applied to the throttle opener with
a hand vacuum pump
●
Accelerator pedal is fully released
0.15 - 0.85V
[Ignition switch: ON]
●
Engine stopped
●
Accelerator pedal is fully depressed
3.5 - 4.7V
42
B/W
Sensor power supply
[Ignition switch: ON]
Approximately 5V
43
BR
Sensor ground
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
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)
EC-748
[VG33E]
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 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 6.
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.
6.
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 8.
NG
>> GO TO 7.
7.
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.
BBIA0418E
AEC638A
Voltage: Approximately 5V
SEF630W
Continuity should exist.
DTC P0121 TP SENSOR
EC-749
[VG33E]
C
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A
EC
8.
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 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-751, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
ADJUST CLOSED THROTTLE POSITION SWITCH
Adjust closed throttle position switch. Refer to
OK or NG
OK
>> GO TO 11.
NG
>> Replace throttle position sensor. To adjust it, perform
11.
CHECK MASS AIR FLOW SENSOR
Refer to
EC-726, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> Replace mass air flow sensor.
Continuity should exist.
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)
EC-750
[VG33E]
DTC P0121 TP SENSOR
12.
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 13.
NG
>> Replace distributor assembly with camshaft position sensor.
13.
CHECK FUEL INJECTOR
1.
Disconnect injector harness connector.
2.
Check resistance between terminals as shown in the figure.
OK or NG
OK
>> GO TO 14.
NG
>> Replace fuel injector.
14.
CHECK INTERMITTENT INCIDENT
EC-696, "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
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