Operation CHARM
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Jaguar
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1989
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XJ-S V12-5.3L
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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
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Description and Operation
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Ignition ECM
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Operating Modes
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All Modes
All Modes
During all operating modes, TDC sensor (crankshaft position) input is used by the ECU to program spark timing. Crankshaft position is referenced from BANK A (right) and entered into ECU timing calculations for all cylinders.