W DOC AIRBUS | TSM A320F

Failure of the Thermocouple - ACOC Oil Temperature on Engine 2


1. Possible Causes
NOTE: This task is to troubleshoot the Clear Language Message (CLM) ACOC OIL TEMP TC/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.
· harness from the EEC connector (4000KS-J4) to the thermocouple - ACOC oil temperature (4016KS)
· THERMOCOUPLE-ACOC OIL TEMPERATURE ( 4016KS )
· EEC ( 4000KS )
· harness from the EEC connector (4000KS-J10) to the thermocouple - ACOC oil temperature (4016KS)
· harness from the channel A EEC connector (4000KS-J4) to the thermocouple - ACOC oil temperature
(4016KS)
· harness from the channel B EEC connector (4000KS-J10) to the thermocouple - ACO oil temperature
(4016KS)
2 Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
REFERENCE QTY DESIGNATION
No specific 1 OHMMETER 500 KOHMS - MEASURING 500 VDC, 0,001 A MAX
B. 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 71-00-00-710-018 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 71-13-00-410-010 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 73-22-34-000-010 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
Ref. AMM 79-32-15-000-010 Removal of the ACOC Oil Temperature Thermocouple
Ref. AMM 79-32-15-400-010 Installation of the ACOC Oil Temperature Thermocouple
70-00-00-03-13 STANDARD PRACTICES - ENGINE - GENERAL - TASK SUPPORTING
DATA
Failure of the Thermocouple - ACOC Oil Temperature on Engine 1(2) SHEET 1
Thermocouple - ACOC Oil Temperature on Engine 1(2) SHEET 1
Figure 79(IAE)-32-00-991-00500-A / SHEET 1/1 - Failure of the Thermocouple - ACOC Oil
Temperature on Engine 1(2) not printed, as per printing preferences
Figure 79(IAE)-32-00-991-00600-A / SHEET 1/1 - Thermocouple - ACOC Oil Temperature on Engine
1(2) not printed, as per printing preferences
3. Fault Confirmation
Subtask 79-32-00-860-056-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 79-32-00-710-068-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 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 TOEL or TOEXCF in FADEC 2A or FADEC 2B, do the steps in
Para 3.C for fault confirmation (engine idle run to confirm the fault).
(a) If the test gives the fault acronym TOEL, or there are two or more occurrences in fault history,
continue with fault isolation Para 4.A.
(b) If the test gives the fault acronym TOEXCF, or there are two or more occurrences in fault history,
continue with fault isolation Para 4.B.
(c) If the test does not give the fault acronym TOEL or TOEXCF, and there is no history of faults,
send the engine back to service.
Subtask 79-32-00-710-115-A
C. Do a test for fault acronym TOEL or TOEXCF.
(1) On the overhead panel 50VU, select ENG FADEC GND PWR 2 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 kept 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 and the scheduled maintenance report of the FADEC 2A and FADEC
2B menu on the MCDU (Ref. TSM 70-00-00-03) .
(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) Do the CFDS message decoding and read the flight data and ground data to identify the fault
acronym.
4. Fault Isolation
(Ref. Fig. Failure of the Thermocouple - ACOC Oil Temperature on Engine
1(2) SHEET 1) (Ref. Fig. Thermocouple - ACOC Oil Temperature on Engine 1(2) SHEET 1)
Subtask 79-32-00-810-061-A
A. Fault Isolation for Fault Acronym TOEL
· The thermocouple - ACOC oil temperature signal is out of range. This is caused by an open, short or
ground, or a wire to wire short in this circuit.
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-J4) to the thermocouple - ACOC
oil temperature (4016KS) 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.
(b) If no problems were found with the harness, disconnect electrical connector (4016KS-A) from
the thermocouple - ACOC oil temperature (4016KS). 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) Do this electrical check of the channel A circuit in the thermocouple - ACOC oil temperature
(4016KS).
1 Make sure there is continuity between contact 2 and contact 3 with a OHMMETER 500
KOHMS - MEASURING 500 VDC, 0,001 A MAX.
2 Make sure the resistance from contact 2 to the mounting flange is more than 100000 (100K)
ohms.
3 Make sure the resistance from contact 2 to contact 5 is more than 100000 (100K) ohms.
4 If a problem is found, remove and replace the THERMOCOUPLE-ACOC
OIL TEMPERATURE ( 4016KS ) Ref. AMM 79-32-15-000-010 and Ref.
AMM 79-32-15-400-010 .
(d) If no problems were found, disconnect electrical connector (4000KS-J4) 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.
(e) Do this electrical check of the harness in channel A. 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.
Thermocouple - ACOC Oil Temperature Circuit Channel A Harness
Thermocouple - ACOC
Oil Temperature (4016KS)
EEC (4000KS)
(4016KS-A) (4000KS-J4)
Contacts Contacts
2 Z
3 E
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 TOEL, send the engine back to service.
2 If the test gives the fault acronym TOEL, remove and replace the THERMOCOUPLEACOC
OIL TEMPERATURE ( 4016KS ) Ref. AMM 79-32-15-000-010 and Ref.
AMM 79-32-15-400-010 .
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 was found in channel B, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J10) to the thermocouple -
ACOC oil temperature (4016KS) 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.
(b) If no problems were found with the harness, disconnect electrical connector (4016KS-A) from
the thermocouple - ACOC oil temperature (4016KS). 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) Do this electrical check of the channel B circuit in the thermocouple - ACOC oil temperature
(4016KS) Ref. ASM 73-25-18.
1 Make sure there is continuity between contact 5 and contact 6 with a OHMMETER 500
KOHMS - MEASURING 500 VDC, 0,001 A MAX.
2 Make sure the resistance from contact 5 to the mounting flange is more than 100000 (100K)
ohms.
3 Make sure the resistance from contact 2 to contact 5 is more than 100000 (100K) ohms.
4 If a problem is found, remove and replace the THERMOCOUPLE-ACOC
OIL TEMPERATURE ( 4016KS ) Ref. AMM 79-32-15-000-010 and Ref.
AMM 79-32-15-400-010 .
(d) If no problems were found, disconnect electrical connector (4000KS-J10) 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.
(e) Do this electrical check of the harness in channel B. 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.
Thermocouple - ACOC Oil Temperature Circuit Channel B Harness
Thermocouple - ACOC
Oil Temperature (4016KS)
EEC (4000KS)
(4016KS-A) (4000KS-J10)
Contacts Contacts
5 Z
6 E
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 TOEL, send the engine back to service.
2 If the test gives the fault fault acronym TOEL, remove and replace the THERMOCOUPLEACOC
OIL TEMPERATURE ( 4016KS ) Ref. AMM 79-32-15-000-010 and Ref.
AMM 79-32-15-400-010 .
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 79-32-00-810-091-A
B. Fault Isolation for Fault Acronym TOEXCF
· The thermocouple - ACOC oil temperature position signal does not agree with the signal from the
opposite channel. This crosscheck fault 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-J4) to the
thermocouple - ACOC oil temperature (4016KS) 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.
(b) Visually examine the harness from the channel B EEC connector (4000KS-J10) to the
thermocouple - ACO oil temperature (4016KS) 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.
(c) If no problems were found with the harness, disconnect electrical connector (4016KS-A) from
the thermocouple - ACOC oil temperature (4016KS). 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 of the channel A and channel B circuit in the thermocouple - ACOC oil
temperature (4016KS) Ref. ASM 73-25-18.
1 Make sure there is continuity between contact 2 and contact 3 with a OHMMETER 500
KOHMS - MEASURING 500 VDC, 0,001 A MAX.
2 Make sure there is continuity between contact 5 and contact 6 with a OHMMETER 500
KOHMS - MEASURING 500 VDC, 0,001 A MAX.
3 Make sure the resistance from contact 2 to the mounting flange is more than 100000 (100K)
ohms.
4 Make sure the resistance from contact 5 to the mounting flange is more than 100000 (100K)
ohms.
5 Make sure the resistance from contact 2 to contact 5 is more than 100000 (100K) ohms.
6 If a problem is found, remove and replace the THERMOCOUPLE-ACOC
OIL TEMPERATURE ( 4016KS ) Ref. AMM 79-32-15-000-010 and Ref.
AMM 79-32-15-400-010 .
(e) If no problems were found with the thermocouple - ACOC oil temperature (4016KS), disconnect
electrical connector (4000KS-J4) 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.
(f) Do this electrical check of the harness in channel A. 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.
Thermocouple - ACOC Oil Temperature Circuit Channel A Harness
Thermocouple - ACOC
Oil Temperature (4016KS)
EEC (4000KS)
(4016KS-A) (4000KS-J4)
Contacts Contacts
2 Z
3 E
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(g) If no problems were found, disconnect electrical connector (4000KS-J10) 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.
(h) Do this electrical check of the harness in channel B. 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.
Thermocouple - ACOC Oil Temperature Circuit Channel B Harness
Thermocouple - ACOC
Oil Temperature (4016KS)
EEC (4000KS)
(4016KS-A) (4000KS-J10)
Contacts Contacts
5 Z
6 E
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(i) Install all the removed connectors Ref. AMM 70-23-15-912-010 .
(j) Do the test for this fault, listed in Para 3. for fault confirmation.
1 If the test does not give the fault acronym TOEXCF, send the engine back to service.
2 If the test gives the fault acronym TOEXCF, remove and replace the THERMOCOUPLEACOC
OIL TEMPERATURE ( 4016KS ) Ref. AMM 79-32-15-000-010 and Ref.
AMM 79-32-15-400-010 .
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 79-32-00-860-057-A
A. Put the aircraft back to its initial configuration.
(1) Make sure the thrust reverser halves 461AL and 462AR 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 04:38:28 UTC
"WTRUIB" 2025