• The ECM supplies a 5 volt reference signal which the Baro sensor uses to produce a linear analog
voltage signal that indicates pressure.
• The primary function of the Baro sensor is to provide altitude information so that the ECM can adjust timing, fuel
quantity, glow plug on time, and turbocharger control.
• The Baro sensor is located inside the ECM. If the sensor fails, the ECM must be replaced.