Operation CHARM
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GMC Truck
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1987
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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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Ignition System
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Electronic Spark Control Module
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Testing and Inspection
Electronic Spark Control Module: Testing and Inspection
Use the following procedures to diagnose ESC system malfunctions only. To diagnose general ignition system malfunctions, refer to ``High Energy Ignition (HEI) System Diagnosis.''