Operation0850−1/A1
Winterthur Gas & Diesel Ltd.
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Failure Text
ME fuel rail pressure meas. fail. diff. high (ID 29)
FCM−20 No. LED Failure ID Display
Indication #03 and #04 AI1 29 29
Cause The sensors PT3461C and PT3462C have a difference of more than 50 bar (failure signal is
released after 7 seconds).
Procedure ⇒ Compare each of the two pressure indications of the fuel rail.
⇒ With the engine stopped and no pressure in the fuel rail, find the pressure transmitter that
gives the different signal.
⇒ If possible, change the engine load through a wider range and find the pressure transmitter
that does not follow linearly to the change in the fuel pressure.
⇒ Do a check of the cables of the pressure transmitter that gives the different signal (plug X25,
terminal 79/80).
⇒ Repair or replace damaged cables on the pressure transmitter that gives the different signal.
⇒ If necessary, replace the applicable pressure transmitter.
Failure Text ME fuel rail pressure high (ID 30)
FCM−20 No. LED Failure ID Display
Indication #03 and #04 AI1 30 30
Cause The measured fuel rail pressure is 50 bar more than the fuel pressure set point (failure signal
is released after 10 seconds).
Remark: No failure when the engine has stopped.
Procedure ⇒ Make sure that the toothed rack can move freely.
⇒ Make sure that the fuel pump actuators are set to on and operate correctly.
⇒ Do a check for actuator alarms in the AMS.
⇒ Make sure that during engine operation and when the engine has stopped, all actuators are at
the same position.
⇒ Make sure that the all actuators are at zero supply when the actuator output is 0%.
⇒ Adjust the toothed racks to get the correct clearances at the minimum / maximum position.
⇒ Replace the defective fuel pump actuator(s).
Remark: An alarm can show if the engine is started and stopped again and again without a
fuel injection release in between.
2014
Failures and Defects of WECS Components
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