P1410
DTC P1410 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE STUCK OPEN1. OUTLINE OF DIAGNOSIS
Always detect the open malfunction of both electromagnetic valve and reed valve of combi valve.
Calculate maximum and minimum values of secondary air supply pipe pressure sensor output voltage during certain period of time after engine starting, and cumulative deviation of output voltage. Judge NG when the difference between max. and min. values, and cumulative deviation are large.
2. ENABLE CONDITION
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously when amount of air flow is large while secondary air pump is not operated after engine starting.
4. DIAGNOSTIC METHOD
Pulsation occurs in secondary air supply pipe pressure sensor output when both electromagnetic valve and reed valve of combi valve have open malfunction. Find this pulsation in the following method, and detect the malfunction.
Calculate maximum (max) and minimum (min) values of secondary air supply pipe pressure sensor output voltage, and cumulative deviation (sum) of output voltage during kCOTIM sec. Compare the difference value between maximum and minimum values with threshold value, and also cumulative value with threshold value. Count up the number of times when both values exceed threshold value. Judge NG when the number of times becomes kCOCOT. Judge OK when both of values do not exceed threshold value or only one of them does.
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
None
8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)