Diagnostic method and apparatus for an exhaust pressure regulator

A diagnostic apparatus for an exhaust pressure regulator provided in an exhaust system connected to a turbocharged internal combustion engine, comprising:

• (a) means for demanding engine brake,
• (b) means for measuring a backpressure in the exhaust system by a backpressure sensor provided between the exhaust pressure regulator and a turbo unit when demanding engine brake,
• (c) means for measuring boost pressure by a boost pressure sensor provided in the inlet manifold when demanding engine brake, and
• (d) means for comparing the measured backpressure and the measured boost pressure with stored backpressure and boost pressure values in order to determine whether there is a defective pressure regulator or a defective backpressure sensor.

A vehicle comprising means for performing diagnostic method for an exhaust pressure regulator provided in an exhaust system connected to a turbocharged internal combustion engine, the method comprising:

• (a) demanding engine brake,
• (b) measuring a backpressure in the exhaust system by a backpressure sensor when demanding engine brake,
• (c) measuring boost pressure by a boost pressure sensor when demanding engine brake, and
• (d) comparing the measured backpressure and the measured boost pressure with stored backpressure and boost pressure values in order to determine whether there is a defective pressure regulator or a defective backpressure sensor.

A vehicle comprising:

• a diagnostic apparatus for an exhaust pressure regulator provided in an exhaust system connected to a turbocharged internal combustion engine, the diagnostic apparatus comprising;
• (a) means for demanding engine brake,
• (b) means for measuring a backpressure in the exhaust system by a backpressure sensor provided between the exhaust pressure regulator and a turbo unit when demanding engine brake,
• (c) means for measuring the boost pressure by a boost pressure sensor provided in the inlet manifold when demanding engine brake, and
• (d) means for comparing the measured backpressure and the measured boost pressure with stored backpressure and boost pressure values in order to determine whether there is a defective pressure regulator or a defective backpressure sensor.