WL-C Engine Exhaust System
Exhaust Shutter Valve Solenoid Valve
• The exhaust shutter valve solenoid valve (ON/OFF-type) is located above the vacuum
chamber in the engine compartment.
Exhaust Shutter Valve Unit
• The exhaust shutter valve unit consists of exhaust shutter valve, exhaust flange, transfer
lever, stop screw, actuation rod, and vacuum actuator.
BT-50_01053
1 Transfer lever 5 Exhaust flange
2 Actuation rod 6 Pivot
3 Exhaust shutter valve vacuum actuator 7 Exhaust shutter valve
4 Stop screw
Operating Conditions
• The warm-up system operates when all of the following conditions are met:
– Warm-up switch pushed
– ECT below 77 °C
– IAT (no.2) below 13 °C
– Engine speed below 1,370 rpm.
Service Training BT-50 01-33
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