DOC AIRBUS | TSM A320FFailure of the HP Bleed Valve Closure Control Solenoid on Engine 1
1. Possible Causes
NOTE: This task is to troubleshoot the Clear Language Message (CLM) 10TH SV BLD SOL/HC/EEC1. The fault
acronyms listed in the fault confirmation section below will help you to focus on the correct cause of this
CLM.
· SOL-HP BLEED VALVE CLOSURE CONTROL ( 4029KS )
· EEC ( 4000KS )
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 36-11-57-000-001 Removal of the High Pressure (HP) Bleed Valve Closure Control
Solenoid
Ref. AMM 36-11-57-400-001 Installation of the High Pressure (HP) Bleed Valve Closure Control
Solenoid
Ref. AMM 70-23-15-912-010 Connection of Electrical Connectors
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 73-22-00-710-040 Operational Test of the FADEC SYSTEM on the Ground
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 78-32-00-410-010 Closing of the Thrust Reverser Halves
HP Bleed Valve Closure Control Solenoid SHEET 1
Figure 75(IAE)-30-00-991-00900-A / SHEET 1/1 - HP Bleed Valve Closure Control Solenoid not
printed, as per printing preferences
3. Fault Confirmation
Subtask 75-30-00-860-140-A
A. Job set-up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the ENG section of the maintenance panel 50VU, select the FADEC GND PWR 1 pushbutton
switch to the ON position.
Subtask 75-30-00-710-270-A
B. Identify the test for fault confirmation.
NOTE: Troubleshooting can start immediately without doing the fault confirmation if this CLM was shown
in multiple flight or ground legs.
(1) Do the Centralized Fault Display System (CFDS) message decoding and read the scheduled
maintenance report to identify the fault acronym related to the CLM (Ref. 70-00-00 Task Supporting
Data Page Block 301).
(2) If the readout gives the fault acronym B1SWAF or B1SWAI in FADEC 1A or FADEC 1B,
do task operational test of the FADEC system on the ground for fault confirmation Ref.
AMM 73-22-00-710-040 .
(a) If the test gives the fault acronym B1SWAF or B1SWAI in FADEC 1A or FADEC 1B or there are
two or more occurrences in fault history, continue with fault isolation Para. 4.A.
(b) If the test does not give the fault acronym B1SWAF or B1SWAI and there is no history of faults,
send the engine back to service.
4. Fault Isolation
(Ref. Fig. HP Bleed Valve Closure Control Solenoid SHEET 1)
Subtask 75-30-00-810-186-A
A. Fault Isolation for fault acronym B1SWAF or B1SWAI
A Wrap Around Fault (WAF) was found in channel A or B. The circuit for the SOL-HP bleed valve closure
control (4029KS) is open, short to ground, or has a wire to wire short.
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 connector (4000KS-J3) to the SOL-HP bleed valve
closure control (4029KS) 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 (4029KS-A) from the
SOL-HP bleed valve closure control (4029KS) Ref. AMM 71-50-00-210-010 . Examine the male
and female parts of the connection:
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) Do this electrical check of the channel A solenoid wiring in the SOL-HP bleed valve closure
control (4029KS) Ref. ASM 73-25-18:
1 Make sure that contacts 3 and 4 are not shorted to ground.
2 Make sure that contacts 3 and 4 are not shorted to other contacts in the connector.
3 Make sure the resistance from contact 3 to contact 4 is between 41 and 77 ohms.
4 If a problem is found, remove and replace the SOL-HP BLEED VALVE CLOSURE
CONTROL ( 4029KS ) Ref. AMM 36-11-57-000-001 and Ref. AMM 36-11-57-400-001 .
(d) If no problems were found, disconnect electrical connector (4000KS-J3) from the EEC (4000KS)
Ref. AMM 71-50-00-210-010 . Examine the male and female parts of the connection:
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.
(e) Do this electrical check of the solenoid wiring in the channel A path of the harness:
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.
TABLEAU 1 : 10th Stage Service Bleed Solenoid Valve Solenoid Wiring Channel A
3 If a problem is found with the harness repair or replace as necessary Ref. ASM 73-25-18.
(f) Install all removed connectors Ref. AMM 70-23-15-912-010 .
(g) Do the test for this fault, listed in Para. 3 for fault confirmation:
1 If the test does not give the fault acronym B1SWAF or B1SWAI send the engine back to
service.
2 If the test gives the fault acronym B1SWAF or B1SWAI, remove and replace the SOL-HP
BLEED VALVE CLOSURE CONTROL ( 4029KS ) Ref. AMM 36-11-57-000-001 and Ref.
AMM 36-11-57-400-001 .
3 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 .
(2) If the fault was found in channel B, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J9) to the SOL-HP bleed valve
closure control (4029KS) 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 (4029KS-A) from the
SOL-HP bleed valve closure control (4029KS) Ref. AMM 71-50-00-210-010 . Examine the male
and female parts of the connection:
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) Do this electrical check of the channel B solenoid wiring in the SOL-HP bleed valve closure
control (4029KS) Ref. ASM 73-25-18:
1 Make sure that contacts 6 and 7 are not shorted to ground.
2 Make sure that contacts 6 and 7 are not shorted to other contacts in the connector.
3 Make sure the resistance from contact 6 to contact 7 is between 41 and 77 ohms.
4 If a problem is found, remove and replace the SOL-HP BLEED VALVE CLOSURE
CONTROL ( 4029KS ) Ref. AMM 36-11-57-000-001 and Ref. AMM 36-11-57-400-001 .
(d) If no problems were found, disconnect electrical connector (4000KS-J9) from the EEC (4000KS)
Ref. AMM 71-50-00-210-010 . Examine the male and female parts of the connection:
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.
(e) Do this electrical check of the solenoid wiring in the channel B path of the harness:
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.
Tableau 2 10th Stage Service Bleed Solenoid Valve Solenoid Wiring Channel B
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(f) Install all removed connectors Ref. AMM 70-23-15-912-010 .
(g) Do the test for this fault, listed in Para. 3 for fault confirmation.
1 If the test does not give the fault acronym B1SWAF or B1SWAI, send the engine back to
service.
2 If the test gives the fault acronym B1SWAF or B1SWAI, remove and replace the SOL-HP
BLEED VALVE CLOSURE CONTROL ( 4029KS ) Ref. AMM 36-11-57-000-001 and Ref.
AMM 36-11-57-400-001 .
3 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 .
5. Close-up
Subtask 75-30-00-860-141-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 437AL and 438AR 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 ENG section of the maintenance panel 50VU, push the FADEC GND PWR 1 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 04:37:15 UTC