owners manual Saab 9-5

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95_US_MY09.book Page 191 Tuesday, April 15, 2008 11:03 AM Car care and technical information 191 Saab Trionic engine ORVR (Onboard Refueling Vapor management system NOTICE Recovery) The Saab Trionic engine management The Trionic engine management system Hydrocarbon vapors formed when refueling system is a unique Saab developm ent that continuously monitors the operation of will be recovered by the car and not combines sequential multiport fuel injection, these systems and has on-board diag-released into the atmosphere. The hydro- electronic distributorless ignition and turbo-nostic capabilities (OBD II). carbons are absorbed in a evaporative charger boost pressure control into one sys- emission canister. When the engine is sub- tem. If the ”Service Engine Light also known as sequently started, the evaporative emission The Trionic engine control module (ECM) CHECK ENGINE” lamp in the main canister is gradually purged as air is sucked monitors many different engine parameters instrument illuminates, this indicates that into it through a shut-off valve. The hydro- such as: the Trionic ECM has detected a problem. carbon/air mixture passes through the evap The car will continue to operate, but per-canister purge valve and into the engine • Intake manifold pressure formance may be diminished. You should where it is burned. • Intake air temperature have your car checked by a Saab dealer When refueling, make sure you screw the as soon as possible. filler cap on and keep turning until it has • Crankshaft position clicked at least 3 times. Otherwise, it is pos- • Engine coolant temperature sible for the CHECK ENGINE light to illumi- • Throttle position and nate. • The oxygen content of the exhaust gases. Refueling, see page 146. 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 inject or 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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