DOC AIRBUS | TSM A320FLoss of the P2/T2 Sensor on Engine 2
1. Possible Causes
NOTE: This task is to troubleshoot the Clear Language Message (CLM) P2T2 SENS/RELAY BOX/HC2. The fault
acronyms listed in the Fault Confirmation section below will help you focus on the correct cause of this CLM
· SENSOR-P2/T2 ( 4014KS )
· RELAY BOX ( 4100KS )
· ( 4114KS )
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 71-00-00-710-018 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 71-51-49-000-010 Removal of the Relay Box
Ref. AMM 73-22-11-000-010 Removal of the P2/T2 Sensor
Ref. AMM 73-22-11-400-010 Installation of the P2/T2 Sensor
Ref. AMM 73-22-11-710-040 Operational Test of the P2/T2 Probe Heater
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
70-00-00-03-13 STANDARD PRACTICES - ENGINE - GENERAL - TASK SUPPORTING
DATA
P2/T2 Sensor SHEET 1
Figure 73(IAE)-22-00-991-00600-A / SHEET 1/1 - P2/T2 Sensor not printed, as per printing
preferences
3. Fault Confirmation
Subtask 73-22-00-860-098-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 73-22-00-710-265-A
B. Identify test to make sure the fault is present.
NOTE: Troubleshooting can start immediately without doing the fault confirmation if this CLM was indicated
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 fault acronym PTHDIS in FADEC 1A or FADEC 1B, do the FADEC System
Operational Test for fault confirmation Ref. AMM 73-22-11-710-040 .
(a) If the test displays "Fault Detected" in FADEC 1A or FADEC 1B, or there are two or more
occurrences of PTHDIS in fault history, continue with Fault Isolation Paragraph 4.A.
(b) If the test displays "No Faults", and there is no history of faults, return the engine to service.
Subtask 73-22-00-710-124-A
C. Test
(1) On the panel 50VU, push the ENG FADEC GND PWR 2 pushbutton switch and release it again.
NOTE: This action 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 and let it become stable for 5
minutes.
NOTE: Operation of the engine for at least 3 minutes erases the LAST LEG REPORT related to the
last flight and the new fault is recorded in the EEC LAST LEG REPORT.
(6) Do a 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 2B)
menu on the MCDU (Ref. 70-00-00 Page Block 301 Task Supporting Data).
(a) Make a record of the maintenance message.
(b) Make a record of the channel FADEC 2A or FADEC 2B which found the fault.
(8) Fully decrease the brightness of the MCDU screen (display off).
4. Fault Isolation
(Ref. Fig. P2/T2 Sensor SHEET 1)
Subtask 73-22-00-810-091-A
A. Fault Isolation for fault acronym PTHDIS
NOTE: At any time during this procedure, you can do steps in Paragraph 3 to make sure that the fault is
corrected.
NOTE: 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 SENSOR-P2/T2 (4014KS) connector to the RELAY BOX
(4100KS): 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) Visually examine the harness from the EEC connector (4000KS-J2) to the RELAY BOX
(4100KS): 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.
(c) Visually examine the harness from the EEC connector (4000KS-J5) to the RELAY BOX
(4100KS): 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.
(d) If no problems were found with the harness, disconnect electrical connector(4014KS-A) from The
SENSOR-P2/T2 (4014KS) 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 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 channel A circuit in the SENSOR-P2/T2 (4014KS) Ref. ASM
73-25-18.
1 Make sure that contacts 4 and 5 are not shorted to ground.
2 Make sure that contacts 4 and 5 are not shorted to any other contacts in the connector.
3 If a problem was found, remove and replace the SENSOR-P2/T2 ( 4014KS ) : Ref.
AMM 73-22-11-000-010 and Ref. AMM 73-22-11-400-010 .
(f) If no problems were found with the harness, disconnect electrical connector (4100KS-A) from
The RELAY BOX (4100KS) 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 suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(g) Do this electrical check of the channel A circuit in the RELAY BOX (4100KS) Ref. ASM
73-25-18.
1 Make sure that contacts 10, 3, 5 and 4 are not shorted to ground.
2 Make sure that contacts 10, 3, 5 and 4 are not shorted to any other contacts in the
connector.
3 If a problem was found, remove and replace the RELAY BOX ( 4100KS ) . Ref.
AMM 71-51-49-000-010 and Ref. AMM 71-51-49-000-010 .
(h) If no problems were found, disconnect electrical connector (4000KS-J2) from the EEC 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 suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(i) If no problems were found with the harness, disconnect electrical connector (4000KS-J5) from
The EEC 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 suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(j) 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 resistance between wires. If resistance is below
100000 (100K) ohms, then the wires are shorted and need to be repaired.
· Wire to wire short check: Measure resistance between wires and harness backshell. If
resistance is below 100000 (100K) ohms, then the wire is shorted to 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 the contacts are in the correct positions in each connector As specified in
the wiring table below.
Table: SENSOR-P2/T2 and RELAY BOX Circuit Channel A Harness
P2/T2 Sensor (4014KS) Relay Box (4100KS)
4014KS-A 4100KS-B
Contacts Contacts
4 4
5 5
Table: RELAY BOX circuit channel A Harness
Relay Box (4100KS) EEC (4000KS)
4100KS-A 4000KS-J2
Contacts Contacts
10 D
3 E
Table: RELAY BOX circuit channel A Harness
Relay Box (4100KS) EEC (4000KS)
4100KS-A 4000KS-J5
Contacts Contacts
5 P
4 g
3 If a problem exists with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(k) Install all removed connectors Ref. AMM 70-23-15-912-010 .
(l) Do the test for this fault, listed in Paragraph 3 for fault confirmation.
1 If the test displays "No Faults", return the engine to service.
2 If the test displays "Fault Detected", remove and replace the RELAY BOX ( 4100KS ) Ref.
AMM 71-51-49-000-010 and Ref. AMM 73-22-11-400-010 .
3 If this fault continues, remove and replace the ( 4114KS ) . Ref. AMM 73-22-11-000-010
and Ref. AMM 73-22-11-400-010 .
4 If this fault continues, remove and replace the EEC. 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 SENSOR-P2/T2 (4014KS) connector to the RELAY BOX
(4100KS): 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) Visually examine the harness from the EEC connector (4000KS-J8) to the RELAY BOX
(4100KS): 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.
(c) Visually examine the harness from the EEC connector (4000KS-J11) to the RELAY BOX
(4100KS): 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.
(d) If no problems were found with the harness, disconnect electrical connector(4014KS-A) from The
SENSOR-P2/T2 (4014KS) 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 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 channel A circuit in the SENSOR-P2/T2 (4014KS) Ref. ASM
73-25-18.
1 Make sure that contacts 4 and 5 are not shorted to ground.
2 Make sure that contacts 4 and 5 are not shorted to any other contacts in the connector.
3 If a problem was found, remove and replace the SENSOR-P2/T2 ( 4014KS ) : Ref.
AMM 73-22-11-000-010 and Ref. AMM 73-22-11-400-010 .
(f) If no problems were found with the harness, disconnect electrical connector (4100KS-A) from
The RELAY BOX (4100KS) 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 suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(g) Do this electrical check of the channel A circuit in the RELAY BOX (4100KS) Ref. ASM
73-25-18.
1 Make sure that contacts 10, 3, 5 and 4 are not shorted to ground.
2 Make sure that contacts 10, 3, 5 and 4 are not shorted to any other contacts in the
connector.
3 If a problem was found, remove and replace the RELAY BOX ( 4100KS ) . Ref.
AMM 71-51-49-000-010 and Ref. AMM 71-51-49-000-010 .
(h) If no problems were found, disconnect electrical connector (4000KS-J8) from the EEC 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 suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(i) If no problems were found with the harness, disconnect electrical connector (4000KS-J11) from
The EEC 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 suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(j) 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 resistance between wires. If resistance is below
100000 (100K) ohms, then the wires are shorted and need to be repaired.
· Wire to wire short check: Measure resistance between wires and harness backshell. If
resistance is below 100000 (100K) ohms, then the wire is shorted to 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 the contacts are in the correct positions in each connector As specified in
the wiring table below.
Table: SENSOR-P2/T2 and RELAY BOX Circuit Channel A Harness
P2/T2 Sensor (4014KS) Relay Box (4100KS)
4014KS-A 4100KS-B
Contacts Contacts
4 4
5 5
Table: RELAY BOX circuit channel A Harness
Relay Box (4100KS) EEC (4000KS)
4100KS-A 4000KS-J2
Contacts Contacts
10 D
3 E
Table: RELAY BOX circuit channel A Harness
Relay Box (4100KS) EEC (4000KS)
4100KS-A 4000KS-J5
Contacts Contacts
5 P
4 g
3 If a problem exists with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(k) Install all removed connectors Ref. AMM 70-23-15-912-010 .
(l) Do the test for this fault, listed in Paragraph 3 for fault confirmation.
1 If the test displays "No Faults", return the engine to service.
2 If the test displays "Fault Detected", remove and replace the RELAY BOX ( 4100KS ) Ref.
AMM 71-51-49-000-010 and Ref. AMM 73-22-11-400-010 .
3 If this fault continues, remove and replace the ( 4114KS ) . Ref. AMM 73-22-11-000-010
and Ref. AMM 73-22-11-400-010 .
4 If this fault continues, remove and replace the EEC. Ref. AMM 73-22-34-000-010 and Ref.
AMM 73-22-34-400-010 .
Subtask 73-22-00-710-125-A
B. Do the test given in Para. 3.
5. Close-up
Subtask 73-22-00-860-099-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 437AL and 438AR are closed Ref. AMM 71-13-00-410-010 . [Rev.6 from Feb 2017] 2026.04.04 04:36:16 UTC