BMW X5: Limp-Home Mode
If a fault is diagnosed in the system, such as e.g. failure of the
high-pressure sensor, the fuel-supply control
valve is de-energized; the fuel then flows via a so-called bypass into the rail.
In the event of HPI limp-home mode, turbocharging is deactivated by an opening
of the wastegate valves.
Causes of HPI limp-home mode can be:
- Implausible high-pressure sensor values
- Failure of the fuel-supply control valve
- Leakage in the high-pressure system
- Failure of the high-pressure pump
- Failure of the high-pressure sensor
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Fig. 56: Identifying Limp-Home Mode Diagram
Fuel System Safety
Working on this fuel system is only permitted after the engine has cooled
down. The coolant temperature must
not exceed 40ºC. This must be observed without fail because otherwise there is a
danger of fuel sprayback on
account of the residual pressure in the high-pressure system.
When working on the high-pressure fuel system, take particular care to ensure
conditions of absolute cleanliness
and follow the work sequences described in the repair instructions. Even the
tiniest contaminant's and damage
to the screw connections on the high-pressure lines can cause leaks.
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Fig. 57: Identifying Fuel System Safety Label
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Fig. 58: Identifying High-Pressure Fuel Lines
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Safety information
Warning
Unattended children or animals in the vehicle
can cause the vehicle to move and endanger
themselves and traffic, for instance due to the
following actions:
Pressing the Start/Stop button.
Releasing the parking brake.
Opening and closing the doors or windows.
Engaging
Special tools required:
31 2 230
31 5 220
WARNING: Danger to life!
Mount securing fixture for vehicle on lifting platform to prevent the
vehicle from slipping off or tilting down.
Necessary preliminary tasks:
Mount securing fixture for vehicle on lifting platform.
Remove front wheel.
Remove