ZEST BOLT Service Manual

Revotron 1.2T 161 Connector View : Component Specification : A dump valve is a pressure release system present in most turbocharged engines. Its purpose is to prevent compressor surge, and reduce wear on the turbocharger and engine. Dump valves relieve the damaging effects of compressor "surge loading" by allowing the compressed air to vent to the atmosphere, making a distinct hissing sound, or re-circulate into the intake upstream of the compressor inlet. Dump Valve is controlled by EMS ECU by a PWM signal. Sensor Stand alone Diagnosis : Measure the resistance across the Dump valve terminals at room temperature; it should be 13.2 +/- 0.5 ohms. iv. Purge Control Valve : Component Details : Purge Valve is a solenoid valve (Variable position), its opening is controlled by controlling the field current of the magnetic coil. Component Location : Preliminary Checks : 1. Loose or damaged connections between actuator and EMS ECU. 2. Check for back out of pins at both actuator and EMS ECU connector. 3. Check for damage of connectors at both actuator and EMS ECU end. 4. Check whether the actuator is stuck open/ closed - Mechanical failure.