P0506

DTC P0506 IDLE AIR CONTROL SYSTEM RPM LOWER THAN EXPECTED

1. OUTLINE OF DIAGNOSIS
Detect the malfunction that actual engine speed is not close to target engine speed during idling.
Judge NG when actual engine speed is not close to target engine speed during idling.




ENABLE CONDITION

3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously during idling.

4. DIAGNOSTIC METHOD




^ Abnormality Judgment
Judge NG when the cumulative time of completing the malfunction criterion below becomes more than the time needed for diagnosis (10 seconds �3 times).




^ Normality Judgment
Judge OK and clear NG when the continuous time of completing the malfunction criterion below becomes more than the time needed for diagnosis (10 seconds).

5. DTC CLEAR CONDITION
^ When the OK idling cycle was completed 40 times in a row
^ When "Clear Memory" was performed

6. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
^ When the OK driving cycle was completed 3 times in a row
^ When "Clear Memory" was performed

7. FAIL SAFE
^ Heavy fuel judgment: Not allowed to carry out the heavy judgment
^ Knock compensation:
^ Knock compensation final timing advance and retard value = knock compensation + whole learning compensation value + partial learning compensation value.
^ At normal: knock compensation = 0 degrees CA is fixed.
^ At trouble: knock compensation not equal to 0 degrees CA is fixed. (Retard max. 12 degrees CA at knock.)
^ Not allowed to update the whole learning compensation factor.
^ Not allowed to calculate the partial learning zone compensation value.

8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)