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185Car care and technical information
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 ope-
ning duration, ignition timing and turbochar-
ger boost pressure to provide excellent
engine performance while maintaining low
emissions and fuel consumption.
ORVR (Onboard Refueling Vapor
Recovery)
Hydrocarbon vapors formed when refueling
will be recovered by the car and not rele-
ased into the atmosphere. The hydrocar-
bons are absorbed in a evaporative emis-
sion canister. When the engine is
subsequently started, the evaporative emis-
sion canister is gradually purged as air is
sucked into it through a shut-off valve. The
hydrocarbon/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 138.
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.