P1492

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

1. OUTLINE OF DIAGNOSIS
- Detects open or short circuit of EGR.
- Judge as NG when the ECM output level differs from the actual terminal level.




2. COMPONENT DESCRIPTION




3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE
Perform diagnosis continuously during EGR operation.

5. DIAGNOSTIC METHOD




Abnormality Judgment
Judge as NG when the continuous time of completing the malfunction criteria below becomes more than the predetermined time.




Normality Judgment
Judge as OK and clear the NG when the malfunction criteria below are met.

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

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

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

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