Operation
0850−1/A1
Winterthur Gas & Diesel Ltd.
9/ 39
4.5 WECS Passive Failure
Failure Text ME scavenge air pressure sensor #1 meas. fail. (ID 8)
FCM−20 No. LED ID Display
Indication #03 AI2 8 8
Cause Sensor signal < 2mA or > 22mA
Procedure ⇒ Do a check of the pressure transmitter PT4043C for damage.
⇒ Use a multimeter to do a check of the 24 VDC supply on the plug X27 (terminals 94+/96−) in
E95.03 and on the transmitter plug (terminals 2+/1−).
⇒ If there is a 24 VDC supply, do a check of the cables between the pressure transmitter
PT4043C and between E12 and E95.03 for correct connections and / or damage.
⇒ Repair or replace damaged cables.
⇒ Use a multimeter to do a check of the sensor signal (X27 terminal 95).
⇒ If necessary, replace the pressure transmitter PT4043C.
FCM−20 No. LED ID Display
Indication #03 AI2 8 8
Cause The sensor power supply has a short circuit (red LED).
Procedure ⇒ In E95.03, disconnect the pressure transmitter PT4043C and the plug X27.
⇒ Use a multimeter to do a check between each of the cables on plug X27 terminal 94 and 95
and ground for short circuit or ground fault.
⇒ Replace damaged cables, or temporarily repair with insulation tape until spares are available.
⇒ Do a check of the transmitter PT4043C for a ground fault. Replace the pressure transmitter if
necessary.
⇒ If failure ID 8 stays on when the plug X27 is disconnected, replace FCM-20 #03.
Failure Text ME scavenge air pressure sensor #2 meas. fail. (ID 8)
FCM−20 No. LED Failure ID Display
Indication #04 AI2 8 8
Cause Sensor signal < 2mA or > 22mA
Procedure ⇒ Do a check of the pressure transmitter PT4044C for damage.
⇒ Use a multimeter to do a check of the 24 VDC supply on the plug X27 (terminals 94+/96−) in
E95.03 and on the transmitter plug (terminals 2+/1−).
⇒ If there is a 24 VDC supply, do a check of the cables between the pressure transmitter
PT4044C and between E12 and E95.03 for correct connections and / or damage.
⇒ Repair or replace damaged cables.
⇒ Use a multimeter to do a check of the sensor signal (X27 terminal 95).
⇒ If necessary, replace the pressure transmitter PT4044C.
FCM−20 No. LED Failure ID Display
Indication #04 AI2 8 8
Cause The sensor power supply has a short circuit (red LED)
Procedure ⇒ In E95.04, disconnect the pressure transmitter PT4044C and plug X27.
⇒ Use a multimeter to do a check between each of the cables on plug X27 terminal 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 pressure transmitter PT4044C for a ground fault. Replace the pressure
transmitter if necessary.
⇒ If failure ID 8 stays on when the plug X27 is disconnected, replace FCM−20 #04.
2014
Failures and Defects of WECS Components
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