P1209

27E4 - P1209

Information saved in
DME

Fault code
27E4 - P1209

Fault text
Vacuum sensor, brake booster, plausibility

Fault description
Brake Booster Pump Shutoff Valve Plausibility

Condition for fault identification
Test condition:
Constant violations of activation threshold or vacuum
gradient is too low during activation
Terminal condition: TERM87
Voltage condition:
none

Condition for fault memory entry
5000 ms

Action in service
1. Check ELUP fuse,
2. Check wires,
3. Replace ELUP

Fault effect and breakdown warning
CC message
Engine speed limited
Reduced power
MIL after engine runs 2x

Driver information
Warning light:
MIL, EML, CC message, backup program

Service instruction
none