Operation CHARM
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Chevrolet
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1986
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Sprint L3-61 1.0L
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Repair and Diagnosis
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Powertrain Management
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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
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Description and Operation
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Ignition Signal
Ignition Signal
Engine speed is obtained by integrating synchronized ignition signals within the ECM. The engine speed information is used to calculate injector basic injection time.