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GMC Truck
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1999
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C 1500 Truck 2WD V8-5.3L VIN T
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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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Fuel Trim Cell
Fuel Trim Cell
The scan tool displays a range of 0 to 23. The
PCM
determines from the
MAP
and RPM inputs which fuel trim cell to operate the engine in. The fuel trim cell displayed on the scan tool is the cell that the engine is operating under.