Ignition Timing

The ECCS control unit uses sensor input to determine correct timing. It sends a signal to a power transistor located on the coil, permitting current to flow through coil. Timing is advanced and retarded by control unit, based on sensor input, built-in programming, and detonation sensor signals.

Fig 1: Datsun/Nissan 280ZX ECCS Schematic & Vacuum Diagram

Courtesy of NISSAN NORTH AMERICA, INC.