up phase thus reducing the emissions. At engine start and coolant temperature lower than +85°C Pin 29 on ECU is grounded and a relay in the engine compartment are activated and closes the electrical circuit for the Heat Plates. The circuit is protected by a 40 A MAXI fuse. When the coolant temperature is warmer than +85°C or four minutes has passed the Heat Plates are switched off. To compensate for the increased air resistance in the intake, engines fitted with Heat Plates have a slightly adjusted charge pressure, Approximately: +0.2 bar, this means that LPT models with heat plates have a solenoid valve to raise the charging pressure above basic charging pressure. In case of a Heat Plate-failure the car may have drivability problems due condensed fuel in the intake during cold engine operations. This condensed fuel is compensated in engines without Heat Plates by enriching the A/F mixture. The heat plates are activated by software, which enables different algorithms to use the plates and to compensate for the intake restriction caused by the plates' presence. Other features Shift Up lamp The Shift Up lamp can be found on OBD II cars. The lamp helps the driver to drive economically. The lamp is supplied by ignition power (+15) and is grounded in the Trionic ECU, pin 55. The Shift Up Lamp is lit when the ignition is turned on for three seconds to test the circuit. During normal driving the lamp is lit when reaching a specific RPM while driving at light loads. At wide-open-throttle the Shift Up lamp is lit when the RPM is near 6000 RPM. The lamp does not light in fifth gear. The light is lit at a higher RPM when the engine is cold to promote a quicker warm up. See also Trionic T5.2 Trionic 8 References External links Trionic Suites reflashing (editing) software Trionic 5 technical information document Saab Trionic Engine control systems Automotive technology tradenames