Operation CHARM
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Chevy Truck
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1999
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K 2500 Suburban 4WD V8-454 7.4L VIN J SFI
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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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Pre HO2S
Pre HO2S
(Not Ready/Ready):
The scan tool will display Not Ready until the
VCM
has commanded closed loop. The
HO2S
is then considered Ready for operation.