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GMC Truck
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1999
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Safari Van AWD V6-4.3L VIN W
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Testing and Inspection
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Scan Tool Testing and Procedures
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Scan Tool Data, Normal Values and Definitions
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Scan Tool Data Definitions - Powertrain Systems
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Decel Fuel Mode
Decel Fuel Mode
ACTIVE/INACTIVE
The scan tool indicates whether the vehicle is in decel fuel cutoff mode. This mode is generally entered during long decels to prevent catalyst overheating and excessive tailpipe emissions.