Subaru IMPREZA GD 2007 Series Manual page 2191

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BG:DTC P0418 SECONDARY AIR INJECTION SYSTEM CONTROL "A" CIRCUIT
1. OUTLINE OF DIAGNOSIS
Judge as NG when the ECM output level differs from the actual terminal level.
2. ENABLE CONDITION
Secondary Parameters
None
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG if the continuous time of meeting the following conditions exceeds 2.5 seconds.
Judgment Value
Malfunction Criteria
Battery voltage
Ignition
Terminal output voltage when ECM out-
puts OFF signal
Time Needed for Diagnosis: 2.5 seconds
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Judgment Value
Malfunction Criteria
Battery voltage
Ignition
Terminal output voltage when ECM out-
puts OFF signal
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
8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
Enable Conditions
Threshold Value
≥ 10.9 V
ON
Low
Threshold Value
≥ 10.9 V
ON
High
GD(STI)-124