SENSING PRESSURES
BOSCH speaks to VITAL NEWS about diesel pressure sensors and pressure control valves.
Fitted into a diesel engine, a diesel pressure sensor functions to relay
a pressure drop in the common rail system to the ECU. The ECU uses
this information to restore the pressure via a high pressure pump.
When modern vehicles experience common rail system problems, faulty
injectors or pumps are key suspects as causes for failure. However, a
faulty fuel pressure sensor or metering control valve can cause similar
symptoms to emerge.
COMMON CODES & SYMPTOMS OF ERROR
The diesel pressure sensor is the weak point in the loop system as it
is very prone to failure. Thus, when a common rail system fails, it is
imperative to conduct a full diagnostic check on the vehicle.
Two common error codes that commonly occur when there is a
problem with the diesel pressure sensor are:
P0193 – fuel rail sensor circuit high input
The power control module (PCM) has detected that the fuel pressure
is not within the range that has been predetermined by the vehicle
manufacturer.
P0087 – fuel rail pressure too low
Typically when there is a problem within the fuel delivery system
which causes the fuel pressure to be too low.
A faulty diesel sensor can also cause the following symptoms to
arise:
• Slower crank time
• Loss of power on power stroke
• Difficulty in starting engine
• Cutting out of power
• Rough, erratic running
AN EASY FIX
Replacing a faulty diesel pressure sensor is comparatively easy within
the common rail system. Whilst the ECU memory needs to be cleared
of all existing fault codes, the engine does not require recoding when
replacing a faulty diesel pressure sensor.
8 DIESEL PRESSURE SENSORS & CONTROL VALVES
Bosch diesel pressure sensors provide very
reliable and accurate measurements at
extremely fast response times to ensure that
the vehicle continues to run as intended. With
built-in circuit protection, it ensures that
corresponding electronics and computer systems
stay unharmed to provide high reliability in
pressure sensing, despite the harsh environment
it operates within. The sturdy design of Bosch
diesel pressure sensors integrates thermal
stability and vibration resistance.
The extensive range of diesel pressure sensors
from Bosch covers all vehicle manufacturers including BMW, Peugeot,
Mercedes-Benz, Citroën, Ford, Vauxhall and VAG.
Application highlights include:
• 0281006158 for Vauxhall Combo 1.6 CDTi (2011>)
• 0281002842 for Mercedes-Benz Sprinter 3.0 CDi (2009-2014)
PRESSURE CONTROL VALVES
Bosch’s diesel accessories also extend to
diesel pressure control valves which are
also known as metering units. The diesel
pressure control valve is located by the
high-pressure pump as it controls the
precise amount of fuel required by the
injectors to the common rail.
With more than 20 parts available currently in range, highlights
include:
• 0928400680 for Alfa Romeo Mito 1.6 JTDM (2008>)
• 0928400498 for BMW 3 Series D (2006-2013)
• 0928400681 for Ford Focus 1.6 TDCi (2005-2012)
NOTE: Bosch pressure control valves are not currently catalogued on MAM Autocat but are available via the F:Drive.
Bosch diesel pressure sensors and pressure control valves are available
from FPS via the F:Drive. For more information, please speak to your
local FPS representative.
VITAL NEWS ISSUE 48