Operation0850−1/A1
Winterthur Gas & Diesel Ltd.
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4.8 WECS Pressure Failure
Failure Text ME Scavenge Air Pressure very HI (ID 11)
FCM−20 No. LED Failure ID Display
Indication #03 and #04 AI2 11 11
Cause The scavenge air pressure is more than 105% (failure signal is released after 2 seconds).
The exhaust waste gate has a malfunction.
Remark: No failure is shown during the conditions that follow:
Shut-down, stop command, scavenge air pressure sensor #1+2 meas. fail.
Procedure ⇒ Decrease engine power.
⇒ For the correct procedures, see the data given in the manual of turbocharger manufacturer
⇒ Do a check of the cables between the FCM20#5 and solenoid valve ZV7076C for correct
connections and / or damage.
⇒ Repair or replace damaged cables.
⇒ If the cables are serviceable, do a function check of the butterfly valve (see 8135−1 Exhaust
Waste Gate, paragraph 3).
⇒ If necessary, replace the butterfly valve or solenoid valve ZV7076C.
Failure Text ME servo oil pressure very low (ID 21)
FCM−20 No. LED Failure ID Display
Indication #01 and #02 AI2 21 21
Cause The servo oil pressure is 50 bar less than the setpoint. The engine speed is more than 8% of
the nominal speed (failure signal is released after 5 seconds).
Remark: No failure is shown during the conditions that follow:
Shut-down, stop command, air run, slow turning, servo oil pressure sensor #1+2 meas. fail.
Procedure ⇒ Do a check of the oil filter downstream of the automatic filter.
⇒ Do a check of the control signals and cables to the servo oil pumps for correct connections
and / or damage.
⇒ Repair or replace damaged cables.
⇒ Make sure that the safety valve 4.23 is open.
⇒ Make sure that the pump drive shaft 4.50 is serviceable.
⇒ Make sure that the servo oil pumps are serviceable (e.g. have no vibration).
⇒ Do a check for leaks between the collector block and the servo oil rail (leakage alarm).
⇒ If necessary, repair the leaks.
⇒ If necessary, replace the related pressure controller (CV7221C to CV7223C).
Remark: In dangerous conditions, you can temporarily set to off the injection and exhaust
valve operation on cylinders 1 or 2 to increase the servo oil pressure.
Attention: Do not set the cylinders to off in their firing order sequence. Do not operate the
engine at or near the barred speed range.
2014
Failures and Defects of WECS Components
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