Operation CHARM
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GMC Truck
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1986
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W Sprint/Caballero V6-262 4.3L
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Repair and Diagnosis
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Relays and Modules
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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
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
Locations
ECM Power
ECM Wiring Harness
Electronic Control Module (ECM)
Connector Views
Underhood Block View
Service and Repair
Engine Compartment Reference Diagrams
Engine Control Module (ECM) Replacement
Diagrams
Specifications
Technical Service Bulletins
