231 Boost Pressure Control Deviation - Above/Below Limit

Diagnosis conditions 

• Boost pressure control active (operating condition close to full load)
• No faults in mixture adapation, pressure sensor, ambient pressure sensor, frequency valve

Possible fault cause 

• Air cleaner clogged
• Hose line from air cleaner to turbocharger kinked
• Leakage on fresh-gas side
• Leakage at exhaust-gas side
• Hoses on frequency valve leaking
• Bypass flaps incorrectly adjusted
• Turbocharger faulty

Affected terminals 

None