Exhaust System Engine
Warm-Up System
• Since the common-rail diesel engines do not provide enough residual heat for the
heating system of the vehicle, a warm-up system has been adopted to heat up the
passenger compartment quickly at low ambient temperatures. It consists of:
– Warm-up switch
– PCM
– Exhaust shutter valve solenoid valve
– Exhaust shutter valve vacuum actuator
– Exhaust shutter valve
• When the driver pushes the warm-up switch the PCM energizes the exhaust shutter
valve solenoid valve. Thereby vacuum is applied to the exhaust shutter valve vacuum
actuator, which closes the exhaust shutter valve in the front pipe of the exhaust system.
Due to the closed shutter valve the exhaust gas backpressure raises, accelerating
engine warming-up and thus quickly providing warm engine coolant for the heating
system.
Wiring Diagram
BT-50_01054
1 PCM 3 Exhaust shutter valve solenoid valve
2 Warm up switch
01-32 Service Training BT-50
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