2002 Saab 9-5 Owner's Manual - Page 149

Starting and driving Limp-home mode The car's engine-management system includes a diagnostic function that checks numerous internal functions after the engine has been shut off. If a fault is detected in the throttle system, the engine-management system puts the throttle system into the limp-home mode. This limits idling control, disables the cruise-control system and limits the capacity of the A/C compressor. If the limp-home mode is in operation ("Engine malfunction (CHECK ENGINE)" light on, see below) and the outside temperature is close to or below freezing, you may need to use some throttle on starting (some pressure on the accelerator). If the diagnostic system has detected a fault in the engine-management system, the "Engine malfunction (CHECK ENGINE)" light on the main instrument panel will come on (see page 53), indicating that you should have the car checked as soon as possible by an authorized Saab dealer. 149 NOTE If the CHECK ENGINE warning light starts to flash, ease off the accelerator slightly. If the light does not cease to flash within 5 seconds, stop the car in a suitable place as soon as possible and turn off the engine. The car must be towed to an authorized Saab dealer. If the CHECK ENGINE warning light flashes, it indicates that the engine is misfiring which can result in damage to the catalytic converter. Important considerations for driving The engine-management system in the Saab 9-5 is called Saab Trionic T7. The system manages the ignition, fuel injection and turbo boost pressure. The Trionic T7 system developed by Saab is an intelligent engine-management system designed to achieve optimum drivability under differing driving conditions. The system makes adjustments automatically, for instance, if the car is being driven at altitude (oxygen-deficient air), for different grades of fuel (AON 87-93) and for different load conditions. 1 Starting and driving • Refrain from using full throttle before the engine has warmed up (before needle in mid-range on temperature gauge). • A safety function prevents the engine from revving faster than 6,000 rpm by limiting the induction air. 2 Stopping the engine • Do not rev the engine immediately before switching it off - stop the engine when it is idling. 3 Regulating the boost pressure • The system is optimized for fuel with an octane rating of AON 90. The 2.3 T (Aero) and 3.0t V6 are optimized for