System Overview

Saab Trionic engine management system

The Trionic is an engine management system which controls the ignition, fuel injection and charging pressure from a single electronic control module. The Trionic system was introduced in 1993 on SAAB 9000 models fitted with the B234L engine.

On model year 1994 and later cars, the following important modifications have been introduced:
- New and shorter basic engine (all versions).
- Trionic system introduced on all versions (including normally aspirated engines).
- Crankshaft position sensor of inductive type, mounted in the engine block.
- Injectors of Bosch manufacture.
- Reduced charging pressure in 1st gear.

The Saab Trionic's ignition system consists of an ignition discharge module with four ignition coils, one for each spark plug. The ignition system is of capacitive type. The spark plugs are used as sensors for the detection of combustion and knocking. This obviates the need for camshaft sensors and knock sensors.

Fuel injection is sequential and governed by the pressure in the intake manifold.

Charging pressure is controlled by a solenoid valve which is connected to the turbo unit wastegate.

Designed by Saab, the Trionic system has enormous development potential.