Nissan Frontier D22. Manual - part 386

TROUBLE DIAGNOSIS

EC-647

[VG33E]

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1. 

INSPECTION START

1.

Check service records for any recent repairs that may indicate a related malfunction, or the current need
for scheduled maintenance.

2.

Open engine hood and check the following:

–

Harness connectors for improper connections

–

Vacuum hoses for splits, kinks, or improper connections

–

Wiring for improper connections, pinches, or cuts

Models with CONSULT-II>>GO TO 2.
Models with GST>>GO TO 2.
Models with No Tools>> GO TO 15.

2. 

CONNECT CONSULT-II OR GST TO THE VEHICLE

 With CONSULT-II

Connect CONSULT-II to the data link connector for CONSULT-II and select “ENGINE” from the menu. Refer to

EC-677, "INSPECTION PROCEDURE"

 .

 With GST

Connect GST to the data link connector for GST.
Refer to 

EC-686, "INSPECTION PROCEDURE"

 .

With CONSULT-II>>GO TO 3.
With GST>>GO TO 14.

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EC-648

[VG33E]

TROUBLE DIAGNOSIS

3. 

CHECK FI CAM FUNCTION

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select  “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II.

3.

Start engine and warm it up.

4.

When engine coolant temperature is 75 to 85

°C (167 to 185°F),

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 

4.

NG

>> 1. Check FI cam. Refer to 

EC-615, "Fast Idle Cam (FIC)

Inspection and Adjustment"

 .

2. GO TO 4.

4. 

CHECK IGNITION TIMING

 With CONSULT-II

1.

Warm up engine to normal operating temperature.

2.

Select  “IGNITION TIMING ADJ” in “WORK SUPPORT” mode
and touch “START”.

3.

Check ignition timing at idle using a timing light.

OK or NG

OK

>> GO TO 5.

NG

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

EC-604, "Idle Speed/Ignition Timing/Idle Mixture
Ratio Adjustment"

 .

2. GO TO 5.

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SEC019C

M/T: 10

±5° BTDC (in Neutral position)

A/T: 10

±5° BTDC (in P or N position)

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TROUBLE DIAGNOSIS

EC-649

[VG33E]

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EC

5. 

CHECK BASE IDLE SPEED

 With CONSULT-II

1.

Select  “IGNITION TIMING ADJ” in “WORK SUPPORT” mode
and touch “START”.

2.

Check idle speed.

OK or NG

OK

>> GO TO 6.

NG

>> 1. Adjust engine speed by turning idle speed adjusting

screw. Refer to 

EC-604, "Idle Speed/Ignition Timing/

Idle Mixture Ratio Adjustment"

 .

2. GO TO 6.

6. 

CHECK CLOSED THROTTLE POSITION SWITCH IDLE POSITION-I

 With 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 3.

3.

Stop engine.

>> GO TO 7.

M/T: 700

±50 rpm (in Neutral position)

A/T: 700

±50 rpm (in P or N position)

SEC019C

EC-650

[VG33E]

TROUBLE DIAGNOSIS

7. 

CHECK CLOSED THROTTLE POSITION SWITCH IDLE POSITION-II

1.

Turn ignition switch ON.

2.

Select “TP SW/TP SEN IDLE POSI ADJ” in “WORK SUPPORT” mode.

3.

Read “CLSD THL/P SW” signal under the following conditions.

●

Insert a 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 and check the signal.

“CLSD THL/P SW” signal should remain “ON” while inserting 0.3 mm (0.012 in) feeler gauge.
“CLSD THL/P SW” signal should remain “OFF” while inserting 0.4 mm (0.016 in) feeler gauge.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 8.

8. 

ADJUSTMENT THROTTLE POSITION SWITCH IDLE POSITION

 With CONSULT-II

NOTE:

●

Never adjust throttle adjust screw (TAS).

●

Do not touch throttle drum when checking “CLSD THL/P SW” signal, doing so may cause an
incorrect adjustment.

1.

Warm up engine to normal operating temperature.

2.

Check FI cam. Refer to procedure 3.

3.

Stop engine.

4.

Loosen throttle position sensor fixing bolts.

>> GO TO 9.

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