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DIAGNOSTIC PROCEDURE
NFEC1188S04
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 com-
ponent parts and their installation condition are question-
able. Check and eliminate the cause of the problem.
It is useful to perform EC-152, “TROUBLE DIAGNOSIS -
SPECIFICATION VALUE”.
5. If any of the following conditions occur after the engine
has started, eliminate the cause of the problem and per-
form “Idle air volume learning” all over again:
− Engine stalls.
− Erroneous idle.
BASIC SERVICE PROCEDURE
Idle Air Volume Learning (Cont’d)
EC-74
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