Operation
0850−1/A1
Winterthur Gas & Diesel Ltd.
23/ 39
Failure Text
ME fuel rail pressure low (ID 31)
FCM−20 No. LED Failure ID Display
Indication #03 and #04 AI1 31 31
Cause Fuel rail pressure is 100 bar less than the fuel pressure setpoint (failure signal is released
after 10 seconds).
Remark: No failure shown during the conditions that follow:
No engine operation, no start command, fuel rail pressure very low
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 of the actuator alarms in the AMS (alarms can show mechanical problems).
⇒ Make sure that the fuel supply pressure is between 7 bar to 10 bar and the pressure down-
stream from the pressure retaining valve is 3 bar to 5 bar.
⇒ Do a check for leakage alarms.
⇒ Make sure that there is an oil supply to the fuel pressure control valve 3.06. Make sure that the
valve seat can move.
⇒ Examine the fuel pressure control valve 3.06 for leaks (if the fuel pressure control valve has a
leak, you can hear a loud noise like a whistle).
⇒ Do a check for damage on the non-return valves 3.22, 3.81−1 and 3.81−2 in the fuel pump
covers.
⇒ Adjust the toothed racks to the correct clearances at the minimum / maximum positions.
⇒ If necessary, replace the fuel pump actuators.
⇒ Repair all the leaks in the system.
⇒ Replace the defective valves.
⇒ Grind the sealing surfaces on the HP fuel pipes between the fuel pump and the fuel rail if leaks
are found, or isolate the pipe(s) temporarily until a repair is possible.
2014
Failures and Defects of WECS Components
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