Subaru IMPREZA GD 2007 Series Manual page 1868

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
7. FAIL SAFE
Rich side malfunction
• Purge control solenoid valve control: Not allowed to purge.
• Heavy fuel judgment control: Not allowed to carry out the heavy judgment.
8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
GD(H4DOTC)-77