Nissan Frontier D40. Manual — part 446

INSPECTION AND ADJUSTMENT

EC-475

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11. Wait 20 seconds.

12. Rev up the engine two or three times and check that idle speed and ignition timing are within the specifi-

cations.

13. If idle speed and ignition timing are not within the specification, Idle Air Volume Learning will not be carried

out successfully. In this case, find the cause of the incident by referring to the DIAGNOSTIC PROCE-
DURE below.

DIAGNOSTIC PROCEDURE

If idle air volume learning cannot be performed successfully, proceed as follows:

1.

Check that throttle valve is fully closed.

2.

Check PCV valve operation.

3.

Check that downstream of throttle valve is free from air leakage.

4.

When the above three items check out OK, engine component parts and their installation condi-
tion are questionable. Check and eliminate the cause of the incident.
It is useful to perform “TROUBLE DIAGNOSIS - SPECIFICATION VALUE”. Refer to

EC-538

.

5.

If any of the following conditions occur after the engine has started, eliminate the cause of the
incident and perform Idle Air Volume Learning again:
• Engine stalls.
• Incorrect idle.

ITEM

SPECIFICATION

Idle speed

M/T: 625

±

50 rpm (in Neutral position)

A/T: 625

±

50 rpm (in P or N position)

Ignition timing

M/T: 15

±

5

°

BTDC (in Neutral position)

A/T: 15

±

5

°

BTDC (in P or N position)

SEC897C

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ENGINE CONTROL SYSTEM

FUNCTION DIAGNOSIS

ENGINE CONTROL SYSTEM

System Diagram

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ENGINE CONTROL SYSTEM

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Engine Control Component Parts Location

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ENGINE CONTROL SYSTEM

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