Operation CHARM
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GMC Truck
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1986
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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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Scan Tool Testing and Procedures
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Exhaust
Exhaust
Indicates whether O2 sensor rich or lean operating condition. Normal displays are "RH" for rich indication and "LN" for lean indication.