Xterra 2WD V6-4.0L (VQ40DE) (2006)
11. Wait 20 seconds.
12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications.
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 PROCEDURE.
DIAGNOSTIC PROCEDURE
If idle air volume learning cannot be performed successfully, proceed as shown:
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 condition are questionable. Check and eliminate the
cause of the incident.
It is useful to perform EC-136,"TROUBLE DIAGNOSIS - SPECIFICATION VALUE". See: Computers and Control Systems/Testing and
Inspection/Monitors, Trips, Drive Cycles and Readiness Codes/Specification (SP) Value
5. If any of the given conditions occur after the engine has started, eliminate the cause of the incident and perform Idle Air Volume Learning all over
again:
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Engine stalls.
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Erroneous idle.