P0506

DTC P0506 - IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED

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

GENERAL DRIVING CYCLE
Always perform diagnosis during idling after engine warmed.

DIAGNOSTIC METHOD




- Abnormality Judgment
Judge NG when the cumulative time of completing the malfunction criteria becomes more than the time needed for diagnosis (10 seconds x 3 times).




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

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

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

FAIL SAFE
Judgment of heavy fuel: Not allowed to make the judgment of heavy fuel. Knock compensation:
- Knock compensation final retard/advance value: Knock compensation value + Total learning compensation value + Partial learning compensation value
- AT normal: Knock compensation value = Fixed on 0 °CA
- AT abnormal: Knock compensation value NOT EQUAL TO Fixed on 0 °CA (Maximum 12 °CA retard on knocking)
- Not allowed to refresh learning compensation coefficient
- Not allowed to calculate partial learning zone compensation value

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