P1492

DTC P1492 EGR SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION (LOW INPUT)

1. OUTLINE OF DIAGNOSIS
- Detect the open/short circuit of EGR.
- Judge NG when ECM output level is different from actual terminal level.




2. COMPONENT DESCRIPTION




3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously when EGR operating.

5. DIAGNOSTIC METHOD




- Abnormality Judgment
Judge NG when the continuous time until completing the malfunction criteria below becomes more than 2.5 seconds.




- Normality Judgment
Judge OK and clear the NG when the malfunction criteria below are not completed.

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

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

8. FAIL SAFE
- Front oxygen (A/F) sensor main learning compensation: Not allowed to calculate
- Knock sensor learning compensation: Not allowed to calculate
- EGR control: Not allowed to operate

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