owners manual Saab 9-3

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Car care 195 Saab Trionic engine management NOTE ORVR (Onboard Refueling Vapor system Recovery) The Saab Trionic engine management The Trionic engine management system All hydrocarbons formed when refueling will system is a unique Saab development that continuously monitors the operation of be recovered by the car and not released combines sequential multiport fuel injection, these systems and has on-board diag-into the atmosphere. The hydrocarbons are electronic distributorless ignition and turbo-nostic capabilities (OBD II). If the CHECK absorbed in an evaporative emission canis- charger boost pressure control into one sys-ENGINE light in the main instrument illu-ter. When the engine is subsequently tem. minates, the Trionic ECM has detected a started, the evaporative emission canister is The Trionic engine control module (ECM) problem. The car will continue to operate, gradually purged as air is sucked into it monitors many different engine parameters but performance may be diminished. You through a shut-off valve. The hydrocar- such as: should have your car checked by a Saab bon/air mixture passes through the evap • Intake manifold pressure.dealer as soon as possible.canister purge valve and into the engine where it is burned. "Refueling", see page • Intake air temperature. 157. • Crankshaft position. • Engine coolant temperature. • Throttle position. • 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.

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