Engine System Overview 2.3.12 Intake Manifold Pressure (Boost) Sensor The boost pressure sensor is an absolute pressure sensor measuring intake manifold air pressure. Boost pressure as displayed by service tools and communicated over the data link is the value obtained by subtracting the atmospheric pressure (as measured by the atmospheric pressure sensor) from the absolute value measured by the boost pressure sensor. 2.3.13 Intake Manifold Air Temperature Sensor Intake manifold air temperature is used to determine temperature of the air intake to the engine. This sensor output is used in controlling the inlet air heater and for engine monitoring.
2.3.14 Coolant Temperature Sensor Coolant temperature sensor is used to determine temperature of the coolant leaving the engine. This sensor output is used in cold start strategies and for engine monitoring. A P P L I C A T I O N A N D I N S T A L L A T I O N G U I D E 11