Distributor Ignition
WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
Distributor Ignition (DI) system uses a power transistor, Camshaft Position (CMP) sensor and the PCM to regulate ignition timing. The CMP sensor is mounted in the distributor and sends a signal to the PCM.
The CMP signal is used to control fuel injection timing, detection of cylinder position, ignition timing, Idle Air Control (IAC) operation and engine speed detection when the engine is running (except during starting).