Nissan Frontier D22. Manual — part 538

TROUBLE DIAGNOSIS

EC-1255

[VG33ER]

C

D

E

F

G

H

I

J

K

L

M

A

EC

15.

CHECK FI CAM FUNCTION

No Tools

1.

Set the voltmeter between ECM terminal 59 (Engine coolant
temperature sensor signal) and ground.

2.

Start engine and warm it up.

3.

When the voltage is between 1.10 to 1.36V, check the following.

–

The center of mark A is aligned with mark C .

–

The cam follower lever's roller is not touching the fast idle cam.

OK or NG

OK

>> GO TO 16.

NG

>> 1. Check FI cam. Refer to

EC-1216, "Fast Idle Cam

(FIC) Inspection and Adjustment"

.

2. GO TO 16.

16.

CHECK IGNITION TIMING

Without CONSULT-II

1.

Warm up engine to normal operating temperature.

2.

Stop engine and disconnect throttle position sensor harness
connector.

3.

Start engine.

4.

Check ignition timing at idle using a timing light.

OK or NG

OK

>> GO TO 17.

NG

>> 1. Adjust ignition timing by turning distributor. Refer to

EC-1205, "Idle Speed/Ignition Timing/Idle Mixture
Ratio Adjustment"

.

2. GO TO 17.

SEF119W

SEF971R

BBIA0424E

M/T: 10

°±5° BTDC (in Neutral position)

A/T: 10

°±5° BTDC (in P or N position)

SEF927Z

EC-1256

[VG33ER]

TROUBLE DIAGNOSIS

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

EC-1205, "Idle Speed/Igni-

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 4 and 5 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)

SEC298C

BBIA0419E

TROUBLE DIAGNOSIS

EC-1257

[VG33ER]

C

D

E

F

G

H

I

J

K

L

M

A

EC

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 4 and 5.

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.

SEC298C

SEF689W

EC-1258

[VG33ER]

TROUBLE DIAGNOSIS

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.

Continuity does not exist while closing the throttle
valve.

SEF689W

SEF864V