Operation CHARM
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GMC Truck
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1988
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S15/T15 4WD Jimmy L4-151 2.5L
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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
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
Service and Repair
Diagrams
Specifications
Technical Service Bulletins
