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Home >> Mitsubishi >> 1989 >> Precis L4-1468cc 1.5L SOHC >> Repair and Diagnosis >> Powertrain Management >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Description and Operation >> Power Circuits >> Engine Speed Signal
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Engine Speed Signal

Ignition Timing System:





The ECU monitors an electric pulse signal from the ignition coil negative terminal and calculates engine RPM according to pulse frequency.

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