DOC AIRBUS | TSM A320FLoss of the FADEC Reset Switch Control on Engine 2
1. Possible Causes
· CTL SW-ENG/MASTER 2 ( 2KC )
· EEC ( 4000KS )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. ESPM 20-45-21
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 73-25-11
AIPC 761208
70-00-00-03-13 STANDARD PRACTICES - ENGINE - GENERAL - TASK SUPPORTING
DATA
3. Fault Confirmation
Subtask 73-22-00-860-090-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 73-22-00-710-116-A
B. Identification of the Test to Make Sure that the Fault is Present
NOTE: The troubleshooting can start immediately without doing the fault confirmation if this CLM was indicated
in multiple flights 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 EXRSTF in FADEC 2A or FADEC 2B, do the FADEC system
operational test for fault confirmation Ref. AMM 73-22-00-710-040 .
(a) If the test gives the fault acronym EXRSTF, or there are two or more occurrences in the fault
history, continue with Fault Isolation Paragraph 4.A.
(b) If the test does not give the fault acronym EXRSTF, and there is no history of faults, return the
engine to service.
4. Fault Isolation
Subtask 73-22-00-810-086-A
A. Fault Isolation for Fault Acronym EXRSTF
NOTE: The following procedure is to be followed for CLM FADEC RESET SW/EEC2 for all engines PRE
SB 73-0236.
NOTE: At any time during this procedure, you can do the steps in Para. 3 to make sure that the fault is
corrected.
NOTE: The removal and installation of the electrical connectors can correct this fault.
(1) If the fault was found in channel A, do the following steps:
(a) Visually examine the harness from the EEC connector (4000KS-J1) to the ENG/MASTER 2
control switch (2KC) 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 exists with the harness, repair or replace as necessary.
(b) If no problems were found with the harness, disconnect the electrical connector from the ENG/
MASTER 2 control switch (2KC) Ref. AMM 71-50-00-210-010 . Examine the male and female
parts of the connection:
WARNING: MAKE SURE THAT THE FADEC IS DE-ENERGIZED. IF IT IS ENERGIZED,
THERE IS A RISK OF INJURY OR DAMAGE.
1 Examine the 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 suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(c) Do this electrical check of the channel A circuit of the ENG/MASTER 2 control switch (2KC) Ref.
ASM 73-25-11.
1 Make sure that contacts 1C and 3C are not shorted to the ground.
2 Make sure that contacts 1C and 3C are not shorted to any other contacts in the connector.
3 If a problem was found, remove and replace the CTL SW-ENG/MASTER 2 ( 2KC ) Ref.
ESPM 20-45-21 and AIPC 761208.
(d) If no problems were found, disconnect the electrical connector (4000KS-J1) from the EEC Ref.
AMM 71-50-00-210-010 . Examine the male and female parts of the connection:
1 Examine the 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 suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(e) Do this electrical check of the wiring in the channel A harness. Look for:
1 Wire-to-wire shorts and shorts to ground.
· Wire-to-wire short check: Measure the resistance between the wires. If the resistance is
below 100000 (100K) ohms, then the wires are shorted and need to be repaired.
· Wire-to-ground short check: Measure the resistance between the wire and harness
backshell. If the resistance is below 100000 (100K) ohms, then the wire is shorted to the
ground and needs to be repaired.
2 Continuity.
· Continuity check: Measure resistance between ends of same wire. If resistance is above
10 ohms, then the wire needs to be repaired.
NOTE: An incorrectly-wired harness can cause this problem. When testing these circuits,
make sure that the contacts are in the correct positions in each connector as specified
in the wiring table below.
ENG/MASTER 2 Control Switch Circuit Channel A Harness
ENG/MASTER 2 Control Switch (2KC) EEC (4000KS)
2KC 4000KS-J1
Contacts Contacts
1C A
3C X
3 If a problem exists with the harness, repair or replace as necessary Ref. ASM 73-25-11.
(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 EXRSTF, return the engine to service.
2 If the test gives the fault acronym EXRSTF, remove and replace the CTL SW-ENG/
MASTER 2 ( 2KC ) Ref. ESPM 20-45-21 and AIPC 761208.
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 following steps:
(a) Visually examine the harness from the EEC connector (4000KS-J7) to the ENG/MASTER 2
control switch (2KC) 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 exists with the harness, repair or replace as necessary.
(b) If no problems were found with the harness, disconnect the electrical connector from the ENG/
MASTER 2 control switch (2KC) Ref. AMM 71-50-00-210-010 . Examine the male and female
parts of the connection:
WARNING: MAKE SURE THAT THE FADEC IS DE-ENERGIZED. IF IT IS ENERGIZED,
THERE IS A RISK OF INJURY OR DAMAGE.
1 Examine the 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 suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(c) Do this electrical check of the channel B circuit of the ENG/MASTER 2 control switch (2KC) Ref.
ASM 73-25-11.
1 Make sure that contacts 1C and 3C are not shorted to the ground.
2 Make sure that contacts 1C and 3C are not shorted to any other contacts in the connector.
3 If a problem was found, remove and replace the CTL SW-ENG/MASTER 2 ( 2KC ) Ref.
ESPM 20-45-21 and AIPC 761208.
(d) If no problems were found, disconnect the electrical connector (4000KS-J7) from the EEC Ref.
AMM 71-50-00-210-010 . Examine the male and female parts of the connection:
1 Examine the 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 suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(e) Do this electrical check of the wiring in the channel B harness. Look for:
1 Wire-to-wire shorts and shorts to ground.
· Wire-to-wire short check: Measure the resistance between the wires. If the resistance is
below 100000 (100K) ohms, then the wires are shorted and need to be repaired.
· Wire-to-ground short check: Measure the resistance between the wire and harness
backshell. If the resistance is below 100000 (100K) ohms, then the wire is shorted to the
ground and needs to be repaired.
2 Continuity.
· Continuity check: Measure resistance between ends of same wire. If resistance is above
10 ohms, then the wire needs to be repaired.
NOTE: An incorrectly-wired harness can cause this problem. When testing these circuits,
make sure that the contacts are in the correct positions in each connector as specified
in the wiring table below.
ENG/MASTER 2 Control Switch Circuit Channel B Harness
ENG/MASTER 2 Control Switch (2KC) EEC (4000KS)
2KC 4000KS-J7
Contacts Contacts
3E A
1E X
3 If a problem exists with the harness, repair or replace as necessary Ref. ASM 73-25-11.
(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 EXRSTF, return the engine to service.
2 If the test gives the fault acronym EXRSTF, remove and replace CTL SW-ENG/MASTER
2 ( 2KC ) Ref. ESPM 20-45-21 and AIPC 761208.
3 If this fault continues, remove and replace EEC ( 4000KS ) Ref. AMM 73-22-34-000-010
and Ref. AMM 73-22-34-400-010 .
5. Close-up
Subtask 73-22-00-860-091-A
A. Put the aircraft back to its initial configuration.
(1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(2) On the panel 50VU, push the ENG FADEC GND PWR 2 pushbutton switch.
(3) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 .
(4) Make sure that the fan cowls 447AL and 448AR are closed Ref. AMM 71-13-00-410-010 . [Rev.6 from Feb 2017] 2026.04.04 04:36:15 UTC