Ignition System: Description and Operation

The programmed ignition system employed in 1988 Acura models provides optimum control of ignition timing using a microcomputer which responds to engine speed and intake manifold vacuum. Information is provided to the microcomputer via signals from the TDC/CRANK sensor (Integra), CRANK/CYL and TDC sensors (Legend), throttle angle, coolant temperature, and MAP sensors (both models). This system operates without a governor or a vacuum diaphragm.
The control unit of the programmed ignition system has stored within it the optimum basic ignition timing for operating conditions based upon engine speed and intake manifold pressure. With compensation by signals from sensors, the system determines optimum timing for ambient conditions and sends voltage pulses to the igniter unit.