Many Acura models are equipped with a distributorless ignition system. This system is still considered a Programmed Ignition (PGM-IG) system. The basic difference is that the distributorless system incorporates one ignition coil per cylinder as opposed to the distributor type system, which uses one ignition coil for the entire system. System operation is accomplished when the ignition switch is in the RUN or START position. Battery current is applied through each of the ignition coils to the ignition control module. The ignition control module acts as a switch to control current through the primary windings of the ignition coils. This module is controlled by the PGM-FI electronic unit. When current to the ignition coil is stopped, a high voltage current flows to the spark plug. The ignition system is controlled by inputs to the PGM-FI electronic control unit. The inputs include; detonation, engine RPM, accelerator position, coolant temperature, ignition timing adjustment, manifold pressure, crankshaft position and exhaust oxygen content. Traction control and the automatic transmission also affect the ignition system.