P0411

DTC P0411 SECONDARY AIR INJECTION SYSTEM INCORRECT FLOW DETECTED

1. OUTLINE OF DIAGNOSIS
Detect NG judging from secondary air delivery pipe pressure, pulse of secondary air delivery pipe pressure and secondary air pipe airflow amount.

2. ENABLE CONDITION

Enable Conditions:

3. GENERAL DRIVING CYCLE
Perform diagnosis while secondary pump is operating

4. DIAGNOSTIC METHOD
Measure secondary air delivery pipe pressure, pulse of secondary air delivery pipe pressure and secondary air pipe airflow amount.

Pump supply pressure check
Perform the system function diagnosis with how much the pressure rises when the secondary air pump is turned from OFF to ON.

Combination valve either one closed pulse diagnosis
Perform open stuck diagnosis of LH combination valve using delivery pipe pressure pulse when RH combination valve is closed.

Perform open stuck diagnosis of RH combination valve using delivery pipe pressure pulse when LH combination valve is closed.

Combination valve both closed pulse diagnosis
Perform open stuck diagnosis of both combination valves using delivery pipe pressure pulse when both combination valves are closed. Determine which side of valves is stuck open by comparing secondary air flow amount when RH combination valve is closed with that when LH combination valve is closed.

Combination valve changeover pressure diagnosis
Perform the RH combination valve stuck closed diagnosis with the variation of delivery pipe pressure when the RH combination valve turns closed --> open.

Perform the LH combination valve stuck closed diagnosis with the variation of delivery pipe pressure when the LH combination valve turns open --> closed.

Overflow diagnosis
Perform secondary air system flow abnormality diagnosis using both sides of combination valves secondary air amount when both are closed.






Judgment Value

Pump supply pressure check
Judge as NG if delivery pipe pressure does not rise though it should when the secondary air pump turns OFF --> ON.

Judge as NG when the following conditions are met. On the other hand, judge as OK and clear the NG when not.






Combination valve either one closed pulse diagnosis
Calculate the voltage pulses of pump delivery pipe pressure when RH combination valve is closed and LH combination valve is open. The calculation should be large because there are pulses in the delivery pipe with LH combination valve open. if it is small, judge that LH combination valve is closed stuck.

Judge as NG when the following conditions are met. On the other hand, judge as OK and clear the NG when not.






Calculate the voltage pulses of pump delivery pipe pressure when LH combination valve is closed and RH combination valve is open. The calculation should be large because there are pulses in the delivery pipe with RH combination valve open. if it is small, judge that RH combination valve is closed stuck.

Judge as NG when the following conditions are met. On the other hand, judge as OK and clear the NG when not.






Combination valve both closed pulse diagnosis
Calculate voltage pulse of the pump supply pipe pressure when both combination valves are closed. The calculation should be small because there is no pulse from supply pipe pressure with both combination valves closed. When the calculation is large, determine that either of the combination valves is stuck open.

Determine which side of valves is stuck open by comparing secondary air flow amount when the RH combination valve is closed with that when the LH combination valve is closed. Air flow amount is larger on the open stuck valve.

Judge as NG when the following conditions are met. On the other hand, judge as OK and clear the NG when not.






Combination valve changeover pressure diagnosis
Deliery pipe pressure should vary when the LH combination valve turns open closed. When the variation is small, determine that the LH combination valve is stuck closed.

Judge as NG when the following conditions are met. On the other hand, judge as OK and clear the NG when not.






Delivery pipe pressure should vary when the RH combination valve turns closed --> open. When the variation is small, determine that the RH combination valve is stuck closed.

Judge as NG when the following conditions are met. On the other hand, judge as OK and clear the NG when not.






Overflow diagnosis
Judge as secondary air system flow abnormality either if there is excessive secondary air flow amount with the RH combination valve closed, or if there is excessive secondary air flow amount with the LH combination valve closed.






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Time Needed for Diagnosis: 10 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

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

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

7. FAIL SAFE
None

8. ECM OPERATION AT DTC SETTING
- Memorize the freeze frame data. (For test mode $02)
- Memorize the diagnostic value and trouble standard value. (For test mode $06)