230 - Boost PSI Character, Upper Value Exceeded - Above Limit

P1255

230 Boost Pressure Characteristic, Upper Value Exceeded - Above Limit

Diagnosis conditions
- Boost pressure control active

Possible fault cause
- Leakage at pressure noses from frequency valve to the bypass flaps
- Frequency valve faulty
- Vacuum modulators for bypass flaps leaking
- Bypass flaps incorrectly adjusted

Affected terminals
- (none)

Diagnosis/Troubleshooting