DOC AIRBUS | TSM A320FFailure of the Pneumatic Starter Valve on Engine 1
1. Possible Causes
NOTE: This task is to troubleshoot the Clear Language Message (CLM) STARTER VALVE/HC/EEC1. The fault acronyms
listed in the fault confirmation section below will help you to focus on the correct cause of this CLM.
· harness
· VALVE-PNEUMATIC STARTER ( 4005KS )
· 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 70-23-15-912-010 Connection of Electrical Connectors
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 73-22-00-710-040 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 74-31-01
REFERENCE DESIGNATION
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
Ref. AMM 80-13-51-000-010 Removal of the Pneumatic Starter Valve
Ref. AMM 80-13-51-400-010 Installation of the Pneumatic Starter Valve
Ref. AMM 80-13-51-710-040 Operational Test of the Pneumatic Starter Valve with the CFDS
70-00-00-03-13 STANDARD PRACTICES - ENGINE - GENERAL - TASK SUPPORTING
DATA
3. Fault Confirmation
Subtask 80-00-00-710-161-A
A. Job Set-up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the overhead panel 50VU, release ENG FADEC GND PWR 1 pushbutton switch.
Subtask 80-00-00-710-064-A
B. Identify the Test for the 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 CFDS message decoding and read the scheduled maintenance report to identify the fault
acronym related to the CLM (Ref. TSM 70-00-00-03) .
(2) If the readout gives the fault acronym STVWAF 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 STVWAF 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 STVWAF and there is no history of faults, send the
engine back to service.
(3) If the readout gives the fault acronym STVXCF, STVFLL, STVFCL or STVFOP in FADEC 1A or
FADEC 1B, do the operational test of the pneumatic starter valve (4005KS) and FMU with CFDS
(through FADEC 1A or FADEC 1B menus) Ref. AMM 80-13-51-710-040 :
(a) If the test gives the fault acronym STVXCF or there are two or more occurrences in fault history,
continue with fault isolation Para. 4.B.
(b) If the test gives the fault acronym STVFLL, STVFCL or STVFOP or there are two or more
occurrences in fault history, continue with fault isolation Para. 4.C.
(c) If the test does not give the fault acronym STVXCF, STVFLL, STVFCL or STVFOP and there is
no history of faults, send the engine back to service.
4. Fault Isolation
Subtask 80-00-00-810-161-A
A. Fault Isolation for the Fault Acronym STVWAF
A torque motor Wrap Around Fault (WAF) was found in channel A or B on engine 1. The circuit for the
pneumatic starter valve (4005KS) 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 acronym was found in channel A, do the steps that follow.
(a) Visually examine the harness from the EEC connector (4000KS-J3) to the pneumatic starter
valve (4005KS) 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 from the pneumatic
starter valve (4005KS) 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 torque motor circuit in the pneumatic starter valve
(4005KS) Ref. ASM 74-31-01:
1 Make sure that contacts 1 and 2 are not shorted to ground.
2 Make sure that contacts 1 and 2 are not shorted to other contacts in the connector.
3 Make sure the resistance from contact 1 to contact 2 is between 50 and 90 ohms.
4 If a problem is found:
· Remove and replace the VALVE-PNEUMATIC STARTER ( 4005KS ) Ref.
AMM 80-13-51-000-010 and Ref. AMM 80-13-51-400-010 .
(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 torque motor wiring 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.
Pneumatic Starter Valve Torque Motor Circuit Channel A Harness
Pneumatic Starter Valve (4005KS) EEC (4000KS)
(4005KS) (4000KS-J3)
Contacts Contacts
1 T
2 i
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 74-31-01.
(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 STVWAF, send the engine back to service.
2 If the test gives the fault acronym STVWAF:
· Remove and replace the VALVE-PNEUMATIC STARTER ( 4005KS ) Ref.
AMM 80-13-51-000-010 and Ref. AMM 80-13-51-400-010 .
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 acronym was found in channel B, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J9) to the pneumatic starter
valve (4005KS) 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 from the pneumatic
starter valve (4005KS) 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 torque motor circuit in the pneumatic starter valve
(4005KS) Ref. ASM 74-31-01:
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 50 and 90 ohms.
4 If a problem is found:
· Remove and replace the VALVE-PNEUMATIC STARTER ( 4005KS ) Ref.
AMM 80-13-51-000-010 and Ref. AMM 80-13-51-400-010 .
(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 torque motor wiring 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.
Pneumatic Starter Valve Torque Motor Circuit Channel B Harness
Pneumatic Starter Valve (4005KS) EEC (4000KS)
(4005KS) (4000KS-J9)
Contacts Contacts
3 T
4 i
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 74-31-01.
(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 STVWAF, send the engine back to service.
2 If the test gives the fault acronym STVWAF:
· Remove and replace the VALVE-PNEUMATIC STARTER ( 4005KS ) Ref.
AMM 80-13-51-000-010 and Ref. AMM 80-13-51-400-010
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 .
Subtask 80-00-00-810-162-A
B. Fault Isolation for the Fault Acronym STVXCF
The pneumatic starter valve (4005KS) position signal does not agree with the signal from the opposite
channel on engine 1. The crosscheck fault (XCF) is caused by an open, short to ground, or a wire to wire
short in this circuit. This fault will always be set in both channels.
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) Do the steps that follow:
(a) Visually examine the harness from the channel A EEC connector (4000KS-J2) to the pneumatic
starter valve (4005KS) 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) Visually examine the harness from the channel B EEC connector (4000KS-J8) to the pneumatic
starter valve (4005KS) 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.
(c) If no problems were found with the harness, disconnect electrical connector from the pneumatic
starter valve (4005KS) 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.
(d) If no problems were found, disconnect electrical connector (4000KS-J2) 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 DISCRETE wiring 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.
Pneumatic Starter Valve DISCRETE Circuit Channel A Harness
Pneumatic Starter Valve (4005KS) EEC (4000KS)
(4005KS) (4000KS-J2)
Contacts Contacts
5 q
6 p
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 74-31-01.
(f) If no problems were found, disconnect electrical connector (4000KS-J8) 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.
(g) Do this electrical check of the DISCRETE wiring 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.
Pneumatic Starter Valve DISCRETE Circuit Channel B Harness
Pneumatic Starter Valve (4005KS) EEC (4000KS)
(4005KS) (4000KS-J8)
Contacts Contacts
7 q
8 p
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 74-31-01.
(h) Install all removed connectors Ref. AMM 70-23-15-912-010 .
(i) Do the test for this fault, listed in Para. 3. for fault confirmation.
1 If the test does not give the fault acronym STVXCF, send the engine back to service.
2 If the test gives the fault acronym STVXCF:
· Remove and replace the VALVE-PNEUMATIC STARTER ( 4005KS ) Ref.
AMM 80-13-51-000-010 and Ref. AMM 80-13-51-400-010 .
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 .
Subtask 80-00-00-810-163-A
C. Fault Isolation for the Fault Acronym STVFLL, STVFCL or STVFOP
The pneumatic starter valve (4005KS) is not responding in time or is failed to latch on engine 1.
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 mechanical problem and not an electrical problem.
(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-PNEUMATIC STARTER ( 4005KS ) Ref. AMM 80-13-51-000-010
and Ref. AMM 80-13-51-400-010 .
(3) Do the test 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 step that follow:
(a) Do the steps for the fault acronym STVWAF listed in Para. 4.A.
(6) Do the test listed in Para. 3. for fault confirmation.
(7) If the test was satisfactory, send the engine back to service.
(8) If the fault continues, do the step that follow:
(a) Do the steps for the fault acronym STVXCF listed in Para. 4.B.
(9) If the 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 80-00-00-860-060-A
A. Put the aircraft back to its initial configuration.
(1) Make sure that the thrust reverser halves 451AL and 452AR 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 panel 50VU, push the ENG 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 04:38:40 UTC