Subaru IMPREZA GD 2007 Series Manual page 1995

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CX:DTC P1410 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE
STUCK OPEN
1. OUTLINE OF DIAGNOSIS
Always detect abnormality that both combination valve electromagnetic valve and the reed valve are open
failure.
Calculate the integrated value of Max./Min. value and output voltage deviation of the secondary air delivery
pipe pressure sensor output voltage in a given time after engine start. Judge as NG if the integrated value
and the difference between Max. and Min. value are large.
2. ENABLE CONDITION
Secondary Parameters
Engine speed
After engine starting
After secondary air system stop
Amount of intake air
Battery voltage
3. GENERAL DRIVING CYCLE
Perform continuous diagnosis when air flow amount is large during the secondary air pump stop after engine
start.
4. DIAGNOSTIC METHOD
When both combination valve electromagnetic valve and the reed valve are open failure, the failure appears
as pulses in the secondary air delivery pipe pressure sensor output. Detect abnormality by capturing these
pulses using the following method.
Calculate Max./Min. value of the secondary air delivery pipe pressure sensor output voltage and the sum of
the output voltage deviation for kCOTIM seconds. Compare the value of the difference between Max. and
Min. value with threshold value and also compare the sum value with the threshold value. If the values ex-
ceed the threshold value, count up NG counter and then judge as NG if the counter reaches kCOCOT times.
Judge as OK if neither exceeds the threshold value, or if either of the two exceeds the threshold value.
Judgment Value
Malfunction Criteria
Pipe inner pressure difference between
Max. and Min.
Sum of the pipe inner pressure variation
value every 4 milliseconds
Barometric pressure variation value
Time Needed for Diagnosis: 2 seconds × 20 times
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
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 CONDITIONS
• When the OK driving cycle is completed three times in a row
• When "Clear Memory" is performed
7. FAIL SAFE
None
Enable Conditions
< 500 rpm
9 seconds or more
9 seconds or more
2 g (0.07 oz)/second
or more and less than
400 g (14.11 oz)/sec-
ond
≥ 10.9 V
Threshold Value
≥ 0.015 V
≥ 2.5 V
< 26.7 kPa (200
mmHg, 7.89 inHg)
GD(H4DOTC)-204