P15DE

11AC01 - P15DE

Information saved in
DME

Fault code
11AC01 - P15DE

Fault text
High-pressure fuel system, cold start: Pressure too high

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

Condition for fault identification
Test condition:
The fault is recognized when rail pressure rises above the
specified figure while the catalytic converter is in its heating
phase.
Potential problem source(s):
- 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 control module's fault memory
immediately.

Action in service
- Check rail-pressure sensor
- Replace rail-pressure sensor
- Low-pressure ECU (EKP electric fuel pump), read out
diagnostic fault codes
- Check low-pressure, sensor, 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: off
- US emissions warning lamp: on
- Electronic engine power reduction: on
- CC message: on

Service instruction
None