Circuit Description

Maximum turbocharging pressure is controlled by a wastegate valve in turbocharger. The wastegate valve is operated by a vacuum actuator controlled by a Vacuum Switching Valve (VSV). The ECM signals the VSV to open or close. DTC is set when under wastegate VSV operating conditions and rapid acceleration, voltage changes occur at VSV4 circuit of ECM. Possible causes are:

• Wastegate valve VSV.
• VSV open or short circuit.
• ECM.