Operation CHARM
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GMC Truck
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1991
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Syclone V6-262 4.3L Turbo
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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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Engine Control Module
Engine Control Module
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Description and Operation
Testing and Inspection
Initial Inspection and Diagnostic Overview
Component Tests and General Diagnostics
Locations
Service and Repair
Engine Control Module (ECM) Replacement
Throttle Body Fuel Injection
Diagrams
Black 24 Pin A-B
Black 32 Pin C-D
Light Green 32 Pin E-F
Specifications
Technical Service Bulletins
