Saab 2007 Saab Trionic engine management system, Orvr Onboard Refueling Vapor Recovery

Car care and technical information 193

Saab Trionic engine management system

The Saab Trionic engine management system is a unique Saab development that combines sequential multiport fuel injection, electronic distributorless ignition and turbo- charger boost pressure control into one sys- tem.

The Trionic engine control module (ECM) monitors many different engine parameters such as:

•Intake manifold pressure

•Intake air temperature

•Crankshaft position

•Engine coolant temperature

•Throttle position and

•The oxygen content of the exhaust gases.

The ECM receives information regarding engine knocking from a sophisticated feed- back function in the ignition discharge unit.

By processing all of this information, the Tri- onic system can control fuel injector open- ing duration, ignition timing and turbo- charger boost pressure to provide excellent engine performance while maintaining low emissions and fuel consumption.

NOTICE

The Trionic engine management system continuously monitors the operation of these systems and has on-board diag- nostic capabilities (OBD II).

If the ”Engine malfunction (CHECK

ENGINE)” lamp in the main instru- ment illuminates, this indicates that the Trionic ECM has detected a problem. The car will continue to operate, but perfor- mance may be diminished. You should have your car checked by a Saab dealer as soon as possible.

ORVR (Onboard Refueling Vapor Recovery)

Hydrocarbon vapors formed when refueling will be recovered by the car and not released into the atmosphere. The hydro- carbons are absorbed in a evaporative emission canister. When the engine is sub- sequently started, the evaporative emission canister is gradually purged as air is sucked into it through a shut-off valve. The hydro- carbon/air mixture passes through the evap canister purge valve and into the engine where it is burned.

When refueling, make sure you screw the filler cap on and keep turning until it has clicked at least 3 times. Otherwise, it is pos- sible for the CHECK ENGINE light to illumi- nate.

Refueling, see page 146.