11AC02

11AC02 - P15DF

Information saved in
DME

Fault code
11AC02 - P15DF

Fault text
Fuel high-pressure system, cold start: pressure too low

Fault description
The diagnostic function monitors pressure levels in the high-
pressure fuel system to determine whether they conform to
specified levels during the catalyst preheating phase.

Condition for fault identification
Test condition:
The fault is recognized when the pressure level in the high-
pressure system is 3.5 bar lower than the specified value.
Potential problem source(s):
- Fuel tank empty
- Defective rail-pressure sensor
- Defect in low-pressure system
- High-pressure pump defective
Terminal condition: Terminal 15
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
None
Time condition:
- None
Other conditions:
- None

Condition for fault memory entry
This fault is logged in the ECU fault memory if it remains
present for longer than 45 sec.

Action in service
- Check rail-pressure sensor
- Replace rail-pressure sensor
- Check low-pressure sensor
- Check operation of fuel pump
- Replace high-pressure pump

Fault effect and breakdown warning
Breakdown notice:
The engine reverts to its limp-home program, continued
vehicle operation is possible but drivability is restricted,
because power is reduced the driver should refrain from
passing maneuvers.
Possible apparent symptoms:
- Loss of power

Driver information
Warning light:
- ECE emissions warning lamp: on
- ECE electronic engine power reduction: on
- CC message: on
- US emissions warning lamp: off
- US electronic engine power reduction: off
- CC message: on

Service instruction
None