Operation
0850−1/A1
Winterthur Gas & Diesel Ltd.
11/ 39
Failure Text
ME fuel rail pressure sensor #1 meas. fail. (ID 27)
FCM−20 No. LED Failure ID Display
Indication #03 AI1 27 27
Cause Sensor signal < 2 mA or > 22 mA (failure signal is released after 3 seconds).
Procedure ⇒ On the fuel rail, do a check of the pressure transmitter PT3461C for damage.
⇒ Use a multimeter to do a check of the 24 VDC supply on the plug X25 (terminal 79+/housing −)
in E95.03 and on the transmitter plug.
⇒ If there is a 24 VDC supply, do a check of the cables between the pressure transmitter
PT3461C 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 (X25 terminal 95).
⇒ If necessary, replace the pressure transmitter PT3461C.
FCM−20 No. LED Failure ID Display
Indication #03 AI1 27 27
Cause The sensor power supply has a short circuit (red LED)
Procedure ⇒ In E95.03, disconnect the pressure transmitter PT3461C and the plug X25.
Remark: ID fault FCM−20 #03 comes on.
⇒ Use a multimeter to do a check between each of the cables on plug X25 terminals 79 and 80
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 PT3461C for a ground fault. Replace the pressure
transmitter if necessary.
⇒ If failure ID 27 stays on when the plug X25 is disconnected, replace FCM−20 #03.
Failure Text ME fuel rail pressure sensor #2 meas. fail. (ID 27)
FCM−20 No. LED Failure ID Display
Indication #04 AI1 27 27
Cause Sensor Signal < 2 mA or > 22 mA (failure signal is released after 3 seconds).
Procedure ⇒ On the fuel rail, do a check of the pressure transmitter PT3462C for damage.
⇒ Use a multimeter to do a check of the 24 VDC supply on the plug X25 (terminal 79+/housing −)
in E95.04 and on the transmitter plug.
⇒ If there is a 24 VDC supply, do a check of the cables between the pressure transmitter
PT3462C to E95.04 for correct connections and / or damage.
⇒ Repair or replace damaged cables.
⇒ Use a multimeter to do a check of the sensor signal (X25 terminal 95).
⇒ If necessary, replace the pressure transmitter PT3461C.
2014
Failures and Defects of WECS Components
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