Operation
0850−1/A1
Winterthur Gas & Diesel Ltd.
19/ 39
Failure Text
ME scavenge air pressure meas. fail. diff. high (ID 10)
FCM−20 No. LED Failure ID Display
Indication #03 and #04 AI2 10 10
Cause The pressure transmitters PT4043C and PT4044C have a difference of more than 0.2 bar
(failure signal is released after 5 seconds)
Procedure ⇒ In the Operator Interface, compare the two scavenge air pressure indications with the
pressure gage. This will help you find the pressure transmitter that gives a different signal.
⇒ In E12, E95.03 and E95.04, do a check of the cables.
⇒ Adjust the applicable pressure transmitter, or replace it if necessary.
Failure Text ME servo oil pressure sensor #1+#2 meas. fail. (ID 17)
FCM−20 No. LED Failure ID Display
Indication #01 and #02 AI2 17 17
Cause The two sensor signals are less than 2 mA or more than 22 mA (failure signal is released
after 3 seconds).
Procedure ⇒ On the servo oil rail, do a check of the pressure transmitters PT2071C and PT2072C for
damage.
⇒ Do a check of the 24 VDC supply on the plugs X27 (terminals 94+/96−) in E95.01 and E95.02
and on the transmitter plugs.
⇒ If there is a 24 VDC supply, do a check of the cables to E95.01 an E95.02.
⇒ Repair or replace damaged cables between the pressure transmitter and E95.01 or E95.02.
⇒ Use a multimeter to do a check of the sensor signal (X27 terminal 95).
⇒ Replace a minimum of one pressure transmitter immediately.
FCM−20 No. LED Failure ID Display
Indication #01 and #02 AI2 17 17
Cause The sensor power supply has a short circuit (red LED)
Procedure ⇒ Disconnect the pressure transmitters PT2071C and PT2072C and the plugs X27
⇒ Use a multimeter to do a check between each of the cables on the plugs X27 terminals 94 and
95 and ground for a short circuit or ground fault.
⇒ Replace damaged cables, or temporarily repair with insulation tape until spares are available.
⇒ Do a check of the transmitters for a ground fault. If necessary, replace the pressure
transmitter(s).
⇒ If failure ID 17 stays on when the plug X27 is disconnected, replace the related FCM−20.
Failure text ME servo oil pressure meas. fail. diff. high (ID 18)
FCM−20 No. LED Failure ID Display
Indication #01 and #02 AI2 18 18
Cause The pressure transmitters PT2071C and PT2072C have a difference of more than 30 bar
(failure signal is released after 7 seconds).
Procedure ⇒ Compare the two servo oil pressure indications.
⇒ With the engine stopped and no pressure in the servo oil 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 servo oil pressure.
⇒ Do a check of the cables in E95.01 and E95.02 of the pressure transmitter that gives the
different signal (plug X27, terminals 94/95).
⇒ Repair or replace damaged cables.
⇒ If necessary, replace the pressure transmitter PT2071C or PT2072C.
2014
Failures and Defects of WECS Components
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