DOC AIRBUS | TSM A320FFailure of the Fuel Temperature Sensor on Engine 2
1. Possible Causes
NOTE: This task is to troubleshoot the Clear Language Message (CLM) FUEL TEMP SENS/HC/EEC1. The fault
codes (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 fuel temperature sensor (4017KS)
· SENSOR-FUEL TEMPERATURE ( 4017KS )
· FCOC ( 6003EM )
· VALVE-FUEL DIVERTER AND RETURN ( 4018KS )
· EEC ( 4000KS )
· harness from the EEC connector (4000KS-J10) to the fuel temperature sensor (4017KS)
· FILTER-FUEL, ENG 2 ( 2000EM2 )
· harness from the channel A EEC connector (4000KS-J4) to the fuel temperature sensor (4017KS)
· harness from the channel B EEC connector (4000KS-J10) to the fuel temperature sensor (4017KS)
2 Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
REFERENCE QTY DESIGNATION
No specific 1 OHMMETER
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 73-12-42-000-010 Removal of the Fuel Filter Element
Ref. AMM 73-12-42-400-010 Installation of the Fuel Filter Element
Ref. AMM 73-13-42-000-010 Removal of the Fuel Diverter and Return Valve
Ref. AMM 73-13-42-400-010 Installation of the Fuel Diverter and Return Valve
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 73-35-15-000-010 Removal of the Fuel Temperature Thermocouple
Ref. AMM 73-35-15-400-010 Installation of the Fuel Temperature Thermocouple
REFERENCE DESIGNATION
Ref. AMM 78-30-00-440-012 Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after
Ground Maintenance
Ref. AMM 78-32-00-410-010 Closing of the Thrust Reverser Halves
Ref. AMM 79-21-43-000-010 Removal of the Fuel Cooled Oil Cooler
Ref. AMM 79-21-43-400-010 Installation of the Fuel Cooled Oil Cooler
70-00-00-03-13 STANDARD PRACTICES - ENGINE - GENERAL - TASK SUPPORTING
DATA
Failure of the Fuel Temperature Sensor on Engine 1(2) SHEET 1
Failure of the Fuel Temperature Sensor on Engine 1(2) SHEET 1
Figure 73(IAE)-22-00-991-02200-A / SHEET 1/1 - Failure of the Fuel Temperature Sensor on Engine
1(2) not printed, as per printing preferences
Figure 73(IAE)-22-00-991-02300-A / SHEET 1/1 - Failure of the Fuel Temperature Sensor on Engine
1(2) not printed, as per printing preferences
3. Fault Confirmation
Subtask 73-22-00-860-148-A
A. Job Set-Up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the ENG section of maintenance panel 50VU, select FADEC GND PWR 2 pushbutton switch to
the ON position.
Subtask 73-22-00-710-176-B
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 TFL or TFXCF 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 TFL in FADEC 2A or FADEC 2B, or there are two or more
occurrences in the fault history, continue with Fault Isolation Para. 4.A.
(b) If the test gives the fault acronym TFXCF in FADEC 2A or FADEC 2B, or there are two or more
occurrences in the fault history, continue with Fault Isolation Para. 4.B.
(c) If the test does not give the fault acronym TFL or TFXCF, and there is no history of faults, return
the engine to service.
Subtask 73-22-00-710-262-B
C. Test for Fault Acronym TFL or TFXCF
(1) On the ENG section of maintenance panel 50VU, select FADEC GND PWR 2 pushbutton switch to
the ON position.
NOTE: This step resets the FADEC memory.
(2) Adjust the brightness of the MCDU screen.
(3) Push the INIT mode key. The INIT page comes into view.
(4) Enter a new flight number.
(5) 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.
(6) Do the shutdown of the engine 2 by the discontinued start, restart and shutdown procedure Ref.
AMM 71-00-00-710-018 .
(7) 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 Fuel Temperature Sensor on Engine 1(2) SHEET 1) (Ref. Fig. Failure of the Fuel
Temperature Sensor on Engine 1(2) SHEET 1)
Subtask 73-22-00-810-119-B
A. Fault Isolation for Fault Acronym TFL
The fuel temperature sensor signal is out of range. This is caused by an open, short to ground or a wireto-
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
that 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 fuel temperature
sensor (4017KS) 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 the lugs (4017KS-A) from the fuel
temperature sensor terminals (4017KS). Examine the male and female parts of the connection
Ref. AMM 71-50-00-210-010 :
1 Repair as necessary.
(c) Do this electrical check of the channel A circuit in the fuel temperature sensor.
1 Make sure that contacts 2 and 3 are not shorted to ground.
2 Make sure that contacts 2 and 3 are not shorted to other contacts in the connector.
NOTE: To obtain the very low OHMIC resistance values associated with this task, a digital
or analog OHMMETER capable of measuring, reading or displaying the value of
"One Thousandths (0.001) OHM" will be necessary.
- Fluke digital DMM model 179 or equivalent
- Simpson analog ohmmeter model 372 or equivalent.
NOTE: Due to the low circuit resistances involved, test instruments lead resistance must be
compensated before taking measurement.
3 Set the multimeter to the "ON" position. Wait for five minutes before you start the test. The
multimeter will become stable after this time.
4 Set test instrument to lowest resistance range.
· Adjust "Zero Ohms" adjustment knob (in the case of an analog ohmmeter) until needle
reads zero ohms.
· Depress the "Null" or "REL" button (in the case of a digital instrument) so that the display
reads zero ohms.
5 Make sure the resistance from contact 2 to contact 3 is between 0.351 and 0.429 ohms for
part number HAD22308 and between 0.204 and 0.320 ohms for part number 22912-000.
6 If a problem is found, remove and replace the SENSOR-FUEL TEMPERATURE ( 4017KS )
Ref. AMM 73-35-15-000-010 and Ref. AMM 73-35-15-400-010 .
(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 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.
Fuel Temp Sensor Circuit Channel A Harness
Fuel Temp Sensor (4017KS) EEC (4000KS)
(4017KS-A) (4000KS-J4)
Fuel Temp Sensor Circuit Channel A Harness
Fuel Temp Sensor (4017KS) EEC (4000KS)
Contacts Contacts
2 C
3 D
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 TFL, send the engine back to service.
2 If the test gives the fault acronym TFL, remove and replace the SENSORFUEL
TEMPERATURE ( 4017KS ) Ref. AMM 73-35-15-000-010 and Ref.
AMM 73-35-15-400-010 .
3 If this fault continues, remove and replace the FCOC ( 6003EM ) Ref.
AMM 79-21-43-000-010 and Ref. AMM 79-21-43-400-010 .
4 If this fault continues, remove and replace the VALVE-FUEL DIVERTER AND
RETURN ( 4018KS ) Ref. AMM 73-13-42-000-010 and Ref. AMM 73-13-42-400-010 .
5 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 fuel temperature
sensor (4017KS) 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 the lugs (4017KS-A) from the fuel
temperature sensor terminals (4017KS). Examine the male and female parts of the connection
Ref. AMM 71-50-00-210-010 :
1 Repair as necessary.
(c) Do this electrical check of the channel B circuit in the fuel temperature sensor Ref. ASM
73-25-18:
1 Make sure that the 5 and 6 are not shorted to ground.
2 Make sure that the 5 and 6 are not shorted to other contacts in the connector.
NOTE: To obtain the very low OHMIC resistance values associated with this task, a digital
or analog OHMMETER capable of measuring, reading or displaying the value of
"One Thousandths (0.001) OHM" will be necessary.
- Fluke digital DMM model 179 or equivalent
- Simpson analog ohmmeter model 372 or equivalent.
NOTE: Due to the low circuit resistances involved, test instruments lead resistance must be
compensated before taking measurement.
3 Set the multimeter to the "ON" position. Wait for five minutes before you start the test. The
multimeter will become stable after this time.
4 Set test instrument to lowest resistance range.
· Adjust "Zero Ohms" adjustment knob (in the case of an analog ohmmeter) until needle
reads zero ohms.
· Depress the "Null" or "REL" button (in the case of a digital instrument) so that the display
reads zero ohms.
5 Make sure the resistance from contact 5 to contact 6 is between 0.351 and 0.429 ohms for
part number HAD22308 and between 0.204 and 0.320 ohms for part number 22912-000.
6 If a problem is found, remove and replace the SENSOR-FUEL TEMPERATURE ( 4017KS )
Ref. AMM 73-35-15-000-010 and Ref. AMM 73-35-15-400-010 .
(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 the 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.
Fuel Temp Sensor Circuit Channel B Harness
Fuel Temp Sensor (4017KS) EEC (4000KS)
(4017KS-A) (4000KS-J10)
Contacts Contacts
5 C
6 D
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 TFL, send the engine back to service.
2 If the test gives the fault acronym TFL, remove and replace the SENSORFUEL
TEMPERATURE ( 4017KS ) Ref. AMM 73-35-15-000-010 and Ref.
AMM 73-35-15-400-010 .
3 If this fault continues, remove and replace the FCOC ( 6003EM ) Ref.
AMM 79-21-43-000-010 and Ref. AMM 79-21-43-400-010 .
4 If this fault continues, remove and replace the VALVE-FUEL DIVERTER AND
RETURN ( 4018KS ) Ref. AMM 73-13-42-000-010 and Ref. AMM 73-13-42-400-010 .
5 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 73-22-00-810-162-B
B. Fault Isolation for Fault Acronym TFXCF
The fuel temperature sensor 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
that the fault is corrected.
NOTE: Disconnection and connection of the electrical connectors can correct this fault.
(1) Do the steps that follow:
(a) Remove and replace FILTER-FUEL, ENG 2 ( 2000EM2 ) Ref. AMM 73-12-42-000-010 and
Ref. AMM 73-12-42-400-010 .
(b) Visually examine the harness from the channel A EEC connector (4000KS-J4) to the fuel
temperature sensor (4017KS) 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) Visually examine the harness from the channel B EEC connector (4000KS-J10) to the fuel
temperature sensor (4017KS) 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.
(d) If no problems are found with the harness, disconnect the lugs (4017KS-A) from the fuel
temperature sensor terminals (4017KS). Examine the male and female parts of the connection
Ref. AMM 71-50-00-210-010 .
1 Repair as necessary.
(e) Do this electrical check of the channel A and B circuit in the fuel temperature sensor Ref. ASM
73-25-18:
1 Make sure that contacts 2, 3, 5 and 6 are not shorted to ground.
2 Make sure that contacts 2, 3, 5 and 6 are not shorted to other contacts in the connector.
NOTE: To obtain the very low OHMIC resistance values associated with this task, a digital
or analog OHMMETER capable or measuring, reading or displaying the value of
"One Thousandths (0.001) OHM" will be necessary.
- Fluke digital DMM model 179 or equivalent
- Simpson analog ohmmeter model 372 or equivalent.
NOTE: Due to the low circuit resistances involved, test instruments lead resistance must be
compensated before taking measurement.
3 Set the multimeter to the "ON" position. Wait for five minutes before you start the test. The
multimeter will become stable after this time.
4 Set test instrument to lowest resistance range.
· Adjust "Zero Ohms" adjustment knob (in the case of an analog ohmmeter) until needle
reads zero ohms.
· Depress the "Null" or "REL" button (in the case of a digital instrument) so that the display
reads zero ohms.
5 Make sure the resistance from contact 5 to contact 6 is between 0.351 and 0.429 ohms for
part number HAD22308 and between 0.204 and 0.320 ohms for part number 22912-000.
6 Make sure the resistance from contact 2 to contact 3 is between 0.351 and 0.429 ohms for
part number HAD22308 and between 0.204 and 0.320 ohms for part number 22912-000.
7 If a problem is found, remove and replace the SENSOR-FUEL TEMPERATURE ( 4017KS )
Ref. AMM 73-35-15-000-010 and Ref. AMM 73-35-15-400-010 .
(f) If no problems were found with the fuel temperature sensor, 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.
(g) Do this electrical check of the harness in the 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.
Fuel Temp Sensor Circuit Channel A Harness
Fuel Temp Sensor (4017KS) EEC (4000KS)
(4017KS-A) (4000KS-J4)
Contacts Contacts
2 C
3 D
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(h) If no problems were found with the harness, disconnect electrical connector (4000KSJ10)
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.
(i) Do this electrical check of the harness in the 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.
Fuel Temp Sensor Circuit Channel B Harness
Fuel Temp Sensor (4017KS) EEC (4000KS)
(4017KS-A) (4000KS-J10)
Contacts Contacts
5 C
6 D
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(j) Install all removed connectors Ref. AMM 70-23-15-912-010 .
(k) Do the test for this fault, listed in Para 3. for fault confirmation.
1 If the test does not give the fault acronym TFXCF, send the engine back to service.
2 If the test gives the fault acronym TFXCF, remove and replace the SENSORFUEL
TEMPERATURE ( 4017KS ) Ref. AMM 73-35-15-000-010 and Ref.
AMM 73-35-15-400-010 .
3 If this fault continues, remove and replace the FCOC ( 6003EM ) Ref.
AMM 79-21-43-000-010 and Ref. AMM 79-21-43-400-010 .
4 If this fault continues, remove and replace the VALVE-FUEL DIVERTER AND
RETURN ( 4018KS ) Ref. AMM 73-13-42-000-010 and Ref. AMM 73-13-42-400-010 .
5 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 73-22-00-860-149-A
A. Put the aircraft back to its initial configuration.
(1) Make sure 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 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 ENG section of maintenance panel 50VU, push 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 04:36:15 UTC