DTC P004E: Turbocharger/Supercharger Boost Control 'A' Circuit Intermittent/Erratic: General Description
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Electric Waste Gate Actuator (EWGA) controls by-pass valve before turbine. ECM opens by-pass valve for exhaust gas to be by-passed when the pressure of exhaust gas is too low because turbine can be a lack to decrease engine power at low RPM.