Mike's Workshop Manuals
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Chevrolet
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2004
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Optra Base, Standard
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - 1.8L (L79) - DTC P0301 To DTC P1114
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DTC P0502
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Conditions for Setting the DTC
Conditions for Setting the DTC
The ECM detects that the vehicle speed is less than 5 km/h (3.1 mph) for more than 35 seconds.