DOC AIRBUS | TSM A320FFailure of the Turbine Cooling-Air Valve-Solenoid on Engine 2
1. Possible Causes
NOTE: This TASK is to troubleshoot the Clear Language Message (CLM) TCA VLV SOL/HC/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.
· SOL VALVE-STAGE 10 AIR ( 4028KS )
· 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 71-13-00-410-010 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 75-23-52-000-010 Removal of the Stage 10 Air Solenoid Valve
Ref. AMM 75-23-52-400-010 Installation of the Stage 10 Air Solenoid Valve
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
70-00-00-03-13 STANDARD PRACTICES - ENGINE - GENERAL - TASK SUPPORTING
DATA
Failure of the Turbine Cooling-Air Valve-Solenoid on Engine 2 SHEET 1
Figure 75(IAE)-23-00-991-00300-A / SHEET 1/1 - Failure of the Turbine Cooling-Air Valve-Solenoid on
Engine 2 not printed, as per printing preferences
3. Fault Confirmation
Subtask 75-23-00-860-052-A
A. Job Set-up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the panel 50VU, release the ENG FADEC GND PWR 2 pushbutton switch.
Subtask 75-23-00-710-052-A
B. Identify 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 CFDS Message Decoding and read the scheduled maintenance report to identify the fault
code or the fault acronym related to the CLM (Ref. TSM 70-00-00-03) .
(2) If the readout gives the fault code 62 (for A1 engines) or fault acronym TMAWAF (for A5 engines)
in FADEC 2A or FADEC 2B, do the operational test of the FADEC SYSTEM on the ground for fault
confirmation Ref. AMM 73-22-00-710-040 .
(a) If the test gives fault code 62 (for A1 engines) or fault acronym TMAWAF (for A5 engines) in
FADEC 2A or FADEC 2B or there are two or more occurrences in fault history, continue with fault
isolation Para. 4.A. or Para. 4.B.
(b) If the test does not give fault code 62 (for A1 engines) or fault acronym TMAWAF (for A5
engines), send the engine back to service.
4. Fault Isolation
(Ref. Fig. Failure of the Turbine Cooling-Air Valve-Solenoid on Engine 2 SHEET 1)
Subtask 75-23-00-810-085-A
A. Fault Isolation for Fault Code 62 (for A1 Engines) or Fault Acronym TMAWAF (for A5 Engines)
A Wrap Around Fault (WAF) was found in channel A. The circuit for the turbine cooling-air valve-solenoid
is open, shorted 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 code or fault acronym was found in channel A, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J5) to the turbine cooling-air
valve-solenoid (4028KS) 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 wire chafing.
4 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(b) If no problems are found with the harness, disconnect electrical connector (4028KS-A) from the
turbine cooling-air valve-solenoid (4028KS) 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 turbine cooling-air valvesolenoid
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 turbine cooling-air valve- solenoid (4028KS)
Ref. AMM 75-23-52-000-010 and Ref. AMM 75-23-52-400-010 .
(d) If no problems are found, disconnect electrical connector (4000KS-J5) 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 circuit wiring in the channel A harness.
1 Look for wire to wire shorts and shorts to ground.
· Wire to wire short check: Measure resistance between wires.
. If resistance is less than 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 less than 100000 (100K) ohms, then the wire is
shorted to ground and must be repaired.
2 Look for 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.
Turbine Cooling Air Valve Solenoid Circuit Channel A Harness
Turbine Cooling Air
Valve Solenoid (4028KS)
EEC (4000KS)
(4028KS-A) (4000KS-J5)
Contacts Contacts
3 G
4 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 code 62 (for A1 engines) or fault acronym TMAWAF (for A5
engines), send the engine back to service.
2 If the test gives fault code 62 (for A1 engines) or fault acronym TMAWAF (for A5 engines),
remove and replace the SOL VALVE-STAGE 10 AIR ( 4028KS ) (turbine cooling-air valvesolenoid)
Ref. AMM 75-23-52-000-010 and Ref. AMM 75-23-52-400-010 .
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 75-23-00-810-083-A
B. Fault Isolation for Fault Code 62 (for A1 Engines) or Fault Acronym TMAWAF (for A5 Engines)
A Wrap Around Fault (WAF) was found in channel B.
The circuit for the turbine cooling-air valve-solenoid is open, shorted 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 code or fault acronym was found in Channel B, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J11) to the turbine cooling-air
valve-solenoid (4028KS) 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 Ref. ASM 73-25-18.
(b) If no problems are found with the harness, disconnect electrical connector (4028KS-A) from the
turbine cooling-air valve-solenoid (4028KS) 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 turbine cooling-air valvesolenoid
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 turbine cooling-air valve-solenoid (4028KS)
Ref. AMM 75-23-52-000-010 and Ref. AMM 75-23-52-400-010 .
(d) If no problems were found, disconnect electrical connector (4000KS-J11) 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 circuit wiring in the channel B harness.
1 Look for wire to wire shorts and shorts to ground.
· Wire to wire short check: Measure resistance between wires.
. If resistance is less than 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 less than 100000 (100K) ohms, then the wire is
shorted to ground and must be repaired.
2 Look for 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.
Turbine Cooling Air Valve Solenoid Circuit Channel B Harness
Turbine Cooling Air
Valve Solenoid (4028KS)
EEC (4000KS)
(4028KS-A) (4000KS-J11)
Contacts Contacts
6 G
7 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 code 62 (for A1 engines) or fault acronym TMAWAF (for A5
engines), send the engine back to service.
2 If the test gives fault code 62 (for A1 engines) or fault acronym TMAWAF (for A5
engines), remove and replace the turbine cooling-air valve-solenoid (4028KS) Ref.
AMM 75-23-52-000-010 and Ref. AMM 75-23-52-400-010 .
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 .
5. Close-up
Subtask 75-23-00-860-053-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 04:37:13 UTC