Grand AM V6-3300 3.3L (1992)
Upshift Indicator: Description and Operation
In vehicles equipped with Manual Transaxle, a bulb lights when the car should be shifted to the next higher gear for better fuel economy. Battery
voltage is applied to one side of the bulb. The other side of the bulb is switched to ground by the ECM which uses engine data such as rpm, vehicle
speed, and intake vacuum to compute an efficient shift point.
