ELECTRONIC CONTROL SYSTEM EGR Drive Module • The EGR Drive Module is mounted below the de-aeration tank. The module receives the desired EGR valve position from the ECM over the engine CAN 2 link. The module then sends a series of voltage and ground signals to the Motor U, V, and W terminals of the EGR valve. The voltage signals are Pulse Width Modulated (PWM) to control current flow to the motor field coils. • The module receives battery voltage and ground through the 12-way engine-to- chassis connector. The module supplies a reference voltage to three position sensors within the EGR valve. The drive module uses the sensor signals to determine the percent of valve opening.
EGR DRIVE MODULE Inlet Air Heater Element The Inlet Air Heater element is located in the lower side of the intake manifold and projects through the manifold and into the inlet air stream. • The element warms the incoming air to aid cold start and reduce emissions during warm-up. The ECM turns the inlet air heater on for a predetermined amount of time, based on engine oil temperature, intake air temperature, and barometric air pressure. The inlet air heater can remain on while the engine is running to reduce white smoke during engine warm-up. INTAKE MANIFOLD INLET AIR HEATER 24 International ® VT 275 V6 Engine