Throttle Valve Switch

A potentiometer type throttle switch is installed on throttle chamber of TR8 models and a contact type is used on all other models. Both throttle switches send electrical impulses to ECU with information on throttle position. On contact type switch, signals are sent to ECU when throttle is fully open or fully closed. See Figure. The potentiometer type monitors the throttle plate angle at all times and through variable resistance, electrical impulses are sent to ECU. The throttle switch on Porsche models deactivates the oxygen sensor during vehicle coasting and when throttle valve is opened more than 30°. This lowers exhaust gas temperatures.