Fault Code 4256

Fault Code 4256

PSM 5.7: Hydraulic unit faulty; PSM 5.3: ABS exhaust valve rear left

Diagnostic conditions
- Ignition switched on
- Rear left outlet valve voltage actual value is evaluated internally and shows implausible value (valve circuit or driver output malfunction)
- PSM 5.3 Short circuit to ground or open circuit

Possible cause of fault
- PSM hydraulic unit faulty
- PSM 5.3 Wire/ plug connection faulty

Affected terminals
PSM 5.7: -
PSM 5.3 25

Diagnosis/troubleshooting PSM 5.7







Diagnosis/troubleshooting PSM 5.3