Ignition System - TFI-IV: Operation

The TFI-IV distributor uses a Hall Effect switch mechanism to switch primary voltage and to trigger the discharge of high secondary voltage. Crankshaft position and load signal is supplied to the EEC-IV Electronic Control Assembly (ECA) to compute spark advance. Distribution of high secondary voltage is accomplished through a conventional cap, rotor, and spark plug wires.

The Profile Ignition Pickup (PIP) assembly generates a signal, which indicates crankshaft position and RPM. The PIP signal is supplied to and processed by the ECA. The ECA outputs a Spark Output Signal (SPOUT). The SPOUT signal is transmitted to the TFI-IV module to control ignition timing. See Figure.