Operation
0850−1/A1
Winterthur Gas & Diesel Ltd.
35/ 39
Failure Text
ME fuel rail pressure very low (ID 32)
FCM−20 No. LED Failure ID Display
Indication #03 and #04 AI1 32 32
Cause The fuel rail pressure is 150 bar more than the fuel pressure setpoint (failure signal is re-
leased after 10 seconds)
Remark: No failure is shown during the conditions that follow:
Stop command, shut-down, engine is stopped, fuel rail pressure sensor #1+2 meas. fail.
Procedure ⇒ Make sure that the fuel pump actuators are set to on and operate correctly.
⇒ Make sure that the toothed racks can move freely.
⇒ In the AMS, do a check of the actuator alarms.
⇒ Make sure that the fuel supply pressure is between 7 bar and 10 bar.
⇒ Make sure that downstream from the pressure retaining valve 3.53, the pressure is between 3
bar and 5 bar.
⇒ Do a check for leakage alarms.
⇒ Make sure that there is oil supply to 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).
⇒ On the fuel pump outlet pipes (TE3431 to TE3436A), do a check of the temperature.
⇒ On the fuel overpressure safety valve 3.52, do a check for leaks.
⇒ Do a check for damage on the non-return valves 3.22, 3.81−1 and 3.81−2.
⇒ Fuel pump plunger cannot move (fuel pump does not supply fuel)
⇒ Adjust the toothed racks to the correct clearances at the minimum / maximum positions.
⇒ If the fuel pump actuators, replace them.
⇒ Repair the leaks.
⇒ 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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