Operation CHARM
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GMC Truck
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1987
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V 3500 P/U 4WD V8-305 5.0L
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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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Relays and Modules - Computers and Control Systems
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Engine Control Module
Engine Control Module
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Description and Operation
Modes of Operation
Acceleration Mode
Battery Voltage Correction Mode
Clear Flood Mode (Port and TBI Injection)
Deceleration Mode
Electronic Spark Timing (EST)
Run Mode
Starting Mode (Port and TBI Injection)
Throttle Body Fuel Injection
Testing and Inspection
Chart C-9A - ECM QDR Check Procedure
Checking Control Module For Bad Solder Joints
Locations
Electronic Control Module (ECM)
Engine Control Module (ECM)
Service and Repair
Diagrams
Specifications
Technical Service Bulletins
