Electronic Concentrated Engine Control: Description

The Electronic Concentrated Engine Control System (ECCS) is a computerized emission, ignition and fuel control system used on 280ZX models.

The system uses a unique Hitachi distributor, that has no reluctor, pick-up coil, pulse generator or ignitor. A crankshaft angle sensor, built into the distributor, replaces the conventional electronic ignition components in the distributor. See Fig 1.

Fig 1: Exploded View of Hitachi ECCS Distributor

Courtesy of NISSAN NORTH AMERICA, INC.

A crankshaft angle sensor, replaces conventional electronic ignition components.

The ignition portion of the system also includes an ignition coil, with an externally-mounted power transistor. The transistor acts as a switch that permits or prohibits current flow through the coil. See Fig 2.

Fig 2: Schematic of Ignition System Portion of ECCS System

Courtesy of NISSAN NORTH AMERICA, INC.

A single ECCS control unit monitors a variety of sensors, air conditioning switch, air flow meter, air temperature sensor, barometric pressure sensor, crankshaft angle sensor, cylinder head temperature sensor, detonation sensor, oxygen sensor, park/neutral switch, throttle valve switch, and vehicle speed sensor.

The computer processes information from these sensors and controls these engine functions: EGR operation, engine idle speed, fuel injectors, fuel pump operation, ignition timing and dwell.