231 - Boost Pressure Control Deviation - Above/Below Limit

P1249

231 Boost Pressure Control Deviation - Above/Below Limit

Diagnosis conditions
- Boost pressure control active (operating condition close to full load)
- No faults in mixture adaptation, 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)

Diagnosis/Troubleshooting

Work Instruction 1 - 6: