ELECTRONIC CONTROL SYSTEM NOT USED NOT USED Boost Control Solenoid The turbocharger boost control solenoid valve is controlled by the ECM. When the ECM signal to the Boost Control solenoid is high, the valve opens, allowing pressure in the pneumatic actuator to vent into the turbo inlet duct. When the ECM signal is low, the valve closes, and pressure to the actuator equals boost pressure in the intake manifold.
AIR INLET DUCT AIR INLET DUCT GREEN HOSE TO GREEN HOSE TO BLACK HOSE TO INTAKE BLACK HOSE TO INTAKE MANIFOLD ELBOW MANIFOLD ELBOW BOOST CONTROL SOLENOID BOOST CONTROL SOLENOID Exhaust Gas Recirculation (EGR) Valve • The EGR valve is used to control the percent of exhaust gas in the intake charge. The EGR valve consists of circuit board mounted position sensors, field coils surrounding an armature, and the valve group. The valve group has two poppet valves mounted to a common stem. When the drive module provides voltage and ground to the field coils in the proper sequence, stepped armature rotation occurs.
A threaded rod engaged in the center of the rotating armature pushes or pulls against the spring loaded valve stem to force the valve to open or close. EGR VALVE EGR VALVE EXHAUST INLET EXHAUST INLET EXHAUST OUTLET EXHAUST OUTLET POPPETS POPPETS EXHAUST EXHAUST O-RINGS O-RINGS OUTLET OUTLET Mass Air Flow (MAF) Sensor The Mass Air Flow (MAF) sensor is mounted with ductwork between the turbocharger inlet and the air filter element. The sensor applies voltage to a low resistance thermistor exposed to the fresh air portion of the intake charge. The MAF sensor circuitry measures the increase in voltage required to offset the cooling effect of the air flow over the thermistor.
This voltage is then converted into a variable frequency that is sent to the ECM. The MAF value can be read with MasterDiagnostics ® software in lb./min. MAF / IAT MAF / IAT 5-PIN 5-PIN MAF MAF CONNECTOR CONNECTOR 26 International ® VT 275 V6 Engine