Operation CHARM
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GMC Truck
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1991
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S15/T15 2WD P/U L4-151 2.5L
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Repair and Diagnosis
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Powertrain Management
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Relays and Modules - Powertrain Management
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Relays and Modules - 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
Specifications
Computer Terminal Voltage Specifications
ECM Terminal Identification & Voltage Specifications
Computer Command Control - Throttle Body Fuel Injection
Technical Service Bulletins
