DOC AIRBUS | TSM A320FFailure of the Fuel Diverter and Return Valve on Engine 2
1. Possible Causes
NOTE: This task is to troubleshoot the Clear Language Message (CLM) FUEL DIV RET VLV/EEC2. The fault
codes or fault acronyms listed in the fault confirmation section below will help you to focus on the correct
cause of this CLM.
· VALVE-FUEL DIVERTER AND RETURN ( 4018KS )
· EEC ( 4000KS )
· harness from the EEC connectors (4000KS-J2) and (4000KS-J5) to the fuel diverter and return valve
(4018KS)
· harness from the EEC connector (4000KS-J8) and (4000KS-J11) to the fuel diverter and return valve
(4018KS)
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power
Ref. AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External
Power
Ref. AMM 31-60-00-860-002 EIS Stop Procedure
Ref. AMM 71-00-00-710-018 Discontinued Start, Restart and Shutdown Procedures
Ref. AMM 71-00-00-710-043 Normal Engine Automatic Start Procedure
Ref. AMM 71-00-00-710-047 Normal Engine Manual Start Procedure
Ref. AMM 71-13-00-010-010 Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 71-13-00-410-010 Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 71-50-00-210-010 Wire Harness Visual Inspection - All Power Plant Electrical Cables
Ref. AMM 73-13-42-000-010 Removal of the Fuel Diverter and Return Valve
Ref. AMM 73-13-42-400-010 Installation of the Fuel Diverter and Return Valve
Ref. AMM 73-22-34-000-010 Removal of the Electronic Engine Control (EEC)
Ref. AMM 73-22-34-400-010 Installation of the Electronic Engine Control (EEC)
Ref. ASM 73-25-18
Ref. AMM 78-30-00-440-012 Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after
Ground Maintenance
Ref. AMM 78-32-00-010-010 Opening of the Thrust Reverser Halves
Ref. AMM 78-32-00-410-010 Closing of the Thrust Reverser Halves
Failure of the Fuel Diverter and Return Valve on Engine 1 (2) SHEET 1
Figure 73(IAE)-00-00-991-00400-A / SHEET 1/1 - Failure of the Fuel Diverter and Return Valve on
Engine 1 (2) not printed, as per printing preferences
3. Fault Confirmation
Subtask 73-00-00-860-070-A
A. Job Set-up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the overhead panel 50VU, select ENG FADEC GND PWR 2 pushbutton switch to the ON position.
Subtask 73-00-00-710-076-A
B. Do a test for CLM FUEL DIV RET VLV/EEC2.
(1) On the overhead panel 50VU, select the ENG FADEC GND PWR 2 pushbutton switch to the ON
position.
NOTE: This step resets the FADEC memory.
(2) Push the INIT mode key. The INIT page comes into view.
(3) Start the engine 2 by the normal engine automatic start procedure Ref. AMM 71-00-00-710-043 or
the normal engine manual start procedure Ref. AMM 71-00-00-710-047 .
NOTE: You must operate the engine for a minimum of three minutes. If not, the last leg report will not
be erased and the fault will not be seen again in the EEC last leg report.
(4) Do the shutdown of the engine 2 by the discontinued start, restart and shutdown procedure Ref.
AMM 71-00-00-710-018 .
(5) Read the last leg report of the FADEC 2A and FADEC 2B menu on the MCDU (Ref. 70-00-00 task
supporting data page block 301).
(a) Make a record of the fault message.
(b) Make a record of the channel FADEC 2A or FADEC 2B which found the fault.
(c) If the test gives the CLM FUEL DIV RET VLV/EEC2 in FADEC 2A or FADEC 2B, or there are two
or more occurrences in fault history, continue with fault isolation Para 4.A.
(d) If the test does not give the CLM FUEL DIV RET VLV/EEC2, and there is no history of faults,
send the engine back to service.
(e) If the test gives the CLM FUL DIV RET VLV/HC/EEC2 in FADEC 2A or FADEC 2B, refer to the
applicable TSM procedures.
4. Fault Isolation
(Ref. Fig. Failure of the Fuel Diverter and Return Valve on Engine 1 (2) SHEET 1)
Subtask 73-00-00-810-063-A
A. Fault Isolation for CLM FUEL DIV RET VLV/EEC2
· The fuel diverter and return valve has failed.
NOTE: After each step that is done during this procedure, you can do the steps in Para 3 to make sure
the fault is corrected.
NOTE: This fault is typically caused by a failure of the fuel diverter and return valve and not the harness.
NOTE: This CLM FUEL DIV RET VLV/EEC2 is associated with the fault code EA (for A1 engines) or fault
acronym FDVFL (for A5 engines).
(1) Open the thrust reverser halves Ref. AMM 78-32-00-010-010 and fan cowls as necessary Ref.
AMM 71-13-00-010-010 .
(2) Remove and replace the VALVE-FUEL DIVERTER AND RETURN ( 4018KS ) Ref.
AMM 73-13-42-000-010 and Ref. AMM 73-13-42-400-010 .
(3) Do the test for this fault, listed in Para 3 for fault confirmation.
(4) If the test was satisfactory, send the engine back to service.
(5) If the fault continues, do the troubleshooting as given in fault isolation Para 4.B.
(6) If this fault continues, remove and replace the EEC ( 4000KS ) Ref. AMM 73-22-34-000-010 and
Ref. AMM 73-22-34-400-010 .
Subtask 73-00-00-710-077-A
B. Do a wiring check for CLM FUEL DIV RET VLV/EEC2.
NOTE: After each step that is done during this procedure, you can do the steps in Para 3 to make sure
the fault is corrected.
NOTE: Disconnection and connection of the electrical connectors can correct this fault.
(1) If the fault was found in channel A, do the steps that follow:
(a) Visually examine the harness from the EEC connectors (4000KS-J2) and (4000KS-J5) to the
fuel diverter and return valve (4018KS) Ref. AMM 71-50-00-210-010 :
1 Look for harness damage.
2 Look for loose or damaged connectors.
3 Look for loose or damaged backshells.
NOTE: Loose backshells must be disassembled and examined for internal wiring chafing.
4 If a problem is found with the harness, repair or replace as necessary.
(b) If no problems were found with the harness, disconnect electrical connector (4018KS-B) from the
fuel diverter and return valve (4018KS).
Examine the male and female parts of the connection Ref. AMM 71-50-00-210-010 :
1 Examine pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(c) If no problems were found, disconnect electrical connectors (4000KS-J2) and (4000KS-J5) from
the EEC (4000KS).
Examine the male and female parts of the connection Ref. AMM 71-50-00-210-010 :
1 Examine pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(d) Do this electrical check in the channel A harness. Look for:
1 Wire to wire shorts and shorts to ground.
· Wire to wire short check: Measure resistance between wires. If resistance is below
100000 (100K) ohms, then the wires are shorted and must be repaired.
· Wire to ground short check: Measure resistance between wire and engine metal or
ground. If resistance is below 100000 (100K) ohms, then the wire is shorted to ground and
must be repaired.
2 Continuity.
· Continuity check: Measure resistance between ends of same wire. If resistance is more
than 10 ohms, then the wire must be repaired.
NOTE: An incorrectly wired harness can cause this problem. When you test these circuits,
make sure the contacts are installed in the correct positions in each connector as
specified in the wiring diagram.
Fuel Diverter and Return Valve Solenoid and Microswitch Circuit Channel A Harness
Fuel Diverter and Return Valve (4018KS) EEC (4000KS)
(4018KS-B) (4000KS-J2)
Contacts Contacts
B r
C t
(4018KS-B) (4000KS-J5)
Contacts Contacts
E F
V a
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(2) If the fault was found in channel B, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J8) and (4000KS-J11) to the
fuel diverter and return valve (4018KS) Ref. AMM 71-50-00-210-010 :
1 Look for harness damage.
2 Look for loose or damaged connectors.
3 Look for loose or damaged backshells.
NOTE: Loose backshells must be disassembled and examined for internal wiring chafing.
4 If a problem is found with the harness, repair or replace as necessary.
(b) If no problems were found with the harness, disconnect electrical connector (4018KS-B) from the
fuel diverter and return valve (4018KS).
Examine the male and female parts of the connection Ref. AMM 71-50-00-210-010 :
1 Examine pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(c) If no problems were found, disconnect electrical connectors (4000KS-J8) and (4000KS-J11) from
the EEC (4000KS).
Examine the male and female parts of the connection Ref. AMM 71-50-00-210-010 :
1 Examine pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(d) Do this electrical check in the channel B harness. Look for:
1 Wire to wire shorts and shorts to ground.
· Wire to wire short check: Measure resistance between wires. If resistance is below
100000 (100K) ohms, then the wires are shorted and must be repaired.
· Wire to ground short check: Measure resistance between wire and engine metal or
ground. If resistance is below 100000 (100K) ohms, then the wire is shorted to ground and
must be repaired.
2 Continuity.
· Continuity check: Measure resistance between ends of same wire. If resistance is more
than 10 ohms, then the wire must be repaired.
NOTE: An incorrectly wired harness can cause this problem. When you test these circuits,
make sure the contacts are installed in the correct positions in each connector as
specified in the wiring diagram.
Fuel Diverter and Return Valve Solenoid and Microswitch Circuit Channel B Harness
Fuel Diverter and Return Valve (4018KS) EEC (4000KS)
(4018KS-B) (4000KS-J8)
Contacts Contacts
R r
S t
(4018KS-B) (4000KS-J11)
Contacts Contacts
M F
N a
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
5. Close-up
Subtask 73-00-00-860-071-A
A. Put the aircraft back to its initial configuration.
(1) Make sure that the thrust reverser halves are closed Ref. AMM 78-32-00-410-010 .
(2) Activate the thrust reverser HCU Ref. AMM 78-30-00-440-012 .
(3) Make sure that the fan cowls 447AL and 448AR are closed Ref. AMM 71-13-00-410-010 .
(4) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(5) On the panel 50VU, push the ENG FADEC GND PWR 2 pushbutton switch.
(6) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 .
(7) Remove the warning notice(s). [Rev.6 from Feb 2017] 2026.04.04 04:36:04 UTC