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Home >> Jaguar >> 1989 >> XJ-S V12-5.3L >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Description and Operation >> Ignition ECM >> Operating Modes >> 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.