Nissan Frontier D22. Manual — part 388
TROUBLE DIAGNOSIS
EC-655
[VG33E]
C
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EC
17.
CHECK BASE IDLE SPEED
Without CONSULT-II
1.
Make sure that throttle position sensor harness connector remain disconnected.
2.
Does engine speed fall to the following speed?
OK or NG
OK
>> GO TO 18.
NG
>> 1. Adjust engine speed by turning idle speed adjusting screw. Refer to
tion Timing/Idle Mixture Ratio Adjustment"
2. GO TO 18.
18.
CHECK CLOSED THROTTLE POSITION SWITCH IDLE POSITION
Without CONSULT-II
NOTE:
Always check ignition timing and base idle speed before performing the following.
1.
Warm up engine to normal operating temperature.
2.
Check FI cam, refer to procedure 14 or 15.
3.
Stop engine.
>> GO TO 19.
19.
CHECK CLOSED THROTTLE POSITION SWITCH IDLE POSITION-I
1.
Disconnect closed throttle position switch harness connector.
2.
Check continuity between closed throttle position switch termi-
nals 5 and 6 under the following conditions.
●
Insert the 0.3 mm (0.012 in) and 0.4 mm (0.016 in) feeler gauge
alternately between the throttle adjust screw (TAS) and throttle
drum as shown in the figure.
Continuity should exist while inserting 0.3 mm (0.012 in)
feeler gauge.
Continuity should not exist while inserting 0.4 mm (0.016 in)
feeler gauge.
OK or NG
OK
>> GO TO 24.
NG
>> GO TO 20.
M/T: 700
±50 rpm (in Neutral position)
A/T: 700
±50 rpm (in P or N position)
SEF862V
BBIA0419E
EC-656
[VG33E]
TROUBLE DIAGNOSIS
20.
ADJUSTMENT THROTTLE POSITION SWITCH IDLE POSITION
Without CONSULT-II
NOTE:
●
Never adjust throttle adjust screw (TAS).
●
Do not touch throttle drum when checking continuity, doing so may cause an incorrect adjust-
ment.
1.
Warm up engine to normal operating temperature.
2.
Check FI cam. Refer to procedure 14 or 15.
3.
Stop engine.
4.
Loosen throttle position sensor fixing bolts.
>> GO TO 21.
21.
ADJUSTMENT CLOSED THROTTLE POSITION SWITCH IDLE POSITION-II
1.
Disconnect closed throttle position switch harness connector.
2.
Insert 0.35 mm (0.0138 in) feeler gauge between the throttle
adjust screw and throttle drum as shown in the figure.
3.
Open throttle valve then close.
4.
Check continuity between closed throttle position switch termi-
nals 5 and 6.
OK or NG
OK
>> GO TO 23.
NG
>> GO TO 22.
22.
ADJUSTMENT THROTTLE POSITION SWITCH IDLE POSITION-III
Without CONSULT-II
Turn throttle position sensor body counterclockwise until continuity
does not exist.
>> GO TO 23.
BBIA0419E
Continuity should not exist while closing the throttle
position sensor.
SEF862V
SEF689W
TROUBLE DIAGNOSIS
EC-657
[VG33E]
C
D
E
F
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M
A
EC
23.
ADJUSTMENT THROTTLE POSITION SWITCH IDLE POSITION-IV
Without CONSULT-II
1.
Remove 0.35 mm (0.0138 in) feeler gauge then insert 0.3 mm (0.012 in) feeler gauge.
2.
Temporarily tighten sensor body fixing bolts as follows.
–
Gradually move the sensor body clockwise and stop it
when the continuity comes to exist, then temporarily
tighten sensor body fixing bolts.
3.
Make sure two or three times that the continuity exists when the
throttle valve is closed and continuity does not exist when it is
opened.
4.
Remove 0.3 mm (0.012 in) feeler gauge then insert 0.4 mm
(0.016 in) feeler gauge.
5.
Make sure two or three times that the continuity does not exist
when the throttle valve is closed.
6.
Tighten throttle position sensor.
7.
Check the continuity again.
OK or NG
OK
>> GO TO 24.
NG >> GO
TO
20.
24.
RESET THROTTLE POSITION SENSOR IDLE POSITION MEMORY
Without CONSULT-II
NOTE:
Always warm up engine to normal operating temperature. If engine is cool, the throttle position sensor
idle position memory will not be reset correctly.
1.
Remove feeler gauge.
2.
Start engine.
3.
Warm up engine to normal operating temperature.
4.
Stop engine. (Turn ignition switch OFF.)
5.
Turn ignition switch ON and wait at least 5 seconds.
6.
Turn ignition switch OFF and wait at least 5 seconds.
7.
Repeat steps 4 and 5 for 20 times.
>> GO TO 25.
25.
REINSTALLATION
Without CONSULT-II
1.
Reconnect throttle position sensor harness connector and closed throttle position switch harness connec-
tor.
2.
Start engine and rev it (2,000 to 3,000 rpm) two or three times under no load and then run engine at idle
speed.
>> GO TO 26.
Continuity does not exist while closing the throttle valve.
SEF689W
SEF864V
EC-658
[VG33E]
TROUBLE DIAGNOSIS
26.
CHECK TARGET IDLE SPEED
Without CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Check idle speed.
OK or NG
OK
>> GO TO 27.
NG
>> 1. Adjust idle speed. Refer to
EC-604, "Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment"
2. GO TO 27.
27.
ERASE UNNECESSARY DTC
After this inspection, unnecessary DTC No. might be displayed.
Erase the stored memory in ECM and TCM (Transmission control module).
Refer to
EC-632, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION"
and
>> INSPECTION END.
M/T: 750
±50 rpm (in Neutral position)
A/T: 750
±50 rpm (in P or N position)
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