Linear EGR Control
WARNING: This page is about a different car, the 2005 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
The linear exhaust gas recirculation (EGR) valve is controlled by a high side driver within the powertrain control module (PCM). This high side driver uses a 12-volt pulse width modulated (PWM) signal. The ground path for the EGR valve is competed by turning on a separate driver within the PCM. The PCM calculates the amount of EGR needed based on the following inputs:
- The engine coolant temperature (ECT) sensor
- The intake air temperature (IAT) sensor
- The barometric pressure (BARO)
- The manifold absolute pressure (MAP) sensor
- The throttle position (TP) sensor
- The mass air flow (MAF) sensor