DOC AIRBUS | TSM A320FFailure of the Relay Box on Engine 2
1. Possible Causes
NOTE: This task is to troubleshoot the Clear Language Message (CLM) RELAY BOX/HC/EEC2. The fault acronyms
listed in the fault confirmation section below will help you to focus on the correct cause of this CLM.
· harness
· RELAY BOX ( 4100KS )
· SENSOR-P2/T2 ( 4014KS )
· 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 71-00-00-710-018 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 71-51-49-400-010 Installation 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
Ref. AMM 74-00-00-710-041 Operational Test of the Ignition System with the CFDS
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 Relay Box on Engine 1(2) SHEET 1
Relay Box on Engine 1(2) SHEET 1
Figure 73(IAE)-00-00-991-00700-A / SHEET 1/1 - Failure of the Relay Box on Engine 1(2) not printed,
as per printing preferences
Figure 73(IAE)-00-00-991-02600-A / SHEET 1/1 - Relay Box on Engine 1(2) not printed, as per printing
preferences
3. Fault Confirmation
Subtask 73-00-00-860-088-A
A. Job Set-up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the ENG section of the maintenance panel 50VU, release FADEC GND PWR 2 pushbutton
switch.
Subtask 73-00-00-710-098-A
B. Identify the Test for Fault Confirmation
NOTE: Troubleshooting can start immediately without doing the fault confirmation if this CLM is 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 fault acronym PTHWAF in FADEC 2A or FADEC 2B, do the P2/T2 probe heater
self test for fault confirmation Ref. AMM 73-22-11-710-040 .
(a) If the test gives the fault acronym PTHWAF in FADEC 2A or FADEC 2B, or there are two or more
occurrences in fault history, continue with fault isolation Para. 4.A.
(b) If the test does not give the fault acronym PTHWAF and there is no history of faults, send the
engine back to service.
(3) If the readout gives fault acronym IGAWAF or IGBWAF in FADEC 2A or FADEC 2B, do the ignition
system test for fault confirmation Ref. AMM 74-00-00-710-041 .
(a) If the test gives the fault acronym IGAWAF in FADEC 2A or FADEC 2B, or there are two or more
occurrences in fault history, continue with fault isolation Para. 4.B.
(b) If the test gives the fault acronym IGBWAF in FADEC 2A or FADEC 2B, or there are two or more
occurrences in fault history, continue with fault isolation Para. 4.C.
(c) If the test does not give the fault acronym IGAWAF or IGBWAF and there is no history of faults,
send the engine back to service.
(4) If the readout gives the fault acronym PTHXCF in FADEC 2A and/or FADEC 2B, do the steps in Para.
3.C. for fault confirmation (engine idle run for fault confirmation).
(a) If the test gives the fault acronym PTHXCF or there are two or more occurrences in fault history,
continue with fault isolation Para. 4.D.
(b) If the test does not give the acronym PTHXCF and there is no history of faults, send the engine
back to service.
Subtask 73-00-00-710-361-A
C. Do a Test for Fault Acronym PTHXCF
(1) On the ENG section of the maintenance panel 50VU, select FADEC GND PWR 2 pushbutton 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 and/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 Relay Box on Engine 1(2) SHEET 1) (Ref. Fig. Relay Box on Engine 1(2) SHEET 1)
Subtask 73-00-00-810-075-A
A. Fault Isolation for Fault Acronym PTHWAF
A Wrap Around Fault (WAF) was found in channel A or B. The circuit for the relay box heater relay is
open, short 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 was found in channel A, do the steps that follow:
(a) 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 wiring 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 (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 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 heater relay circuit in the relay box (4100KS) 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 other contacts in the connector.
3 If a problem is found, remove and replace the RELAY BOX ( 4100KS ) Ref.
AMM 71-51-49-000-010 and Ref. AMM 71-51-49-400-010 .
(d) If no problems were 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 heater relay 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 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.
Relay Box Heater Relay Circuit Channel A Harness
Relay Box (4100KS) EEC (4000KS)
(4100KS-A) (4000KS-J5)
Contacts Contacts
5 P
4 g
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(f) If no problems were found, visually examine the harness from the relay box connector (4100KSB)
to the P2/T2 sensor connector (4014KS-A) 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.
(g) If no problems were found, disconnect electrical connector (4014KS-A) from the P2/T2 sensor
(4014KS) 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.
(h) Do this electrical check of the P2/T2 sensor (4014KS) deicing circuit Ref. ASM 73-25-18:
1 Make sure that contacts 5 and 4 are not shorted to ground.
2 Make sure that contacts 5 and 4 are not shorted to other contacts in the connector.
3 Make sure that the resistance between pins 5 and 4 is between 10 and 28 ohms.
4 If a problem is found, remove and replace the SENSOR-P2/T2 ( 4014KS ) Ref.
AMM 73-22-11-000-010 and Ref. AMM 73-22-11-400-010 .
(i) If no problems were found, disconnect electrical connector (4100KS-B) 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 socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(j) Do this electrical check of the P2/T2 Sensor (4014KS) Deicing wiring. 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.
P2/T2 Sensor Deicing Circuit Harness
P2/T2 Sensor (4014KS) Relay Box (4100KS)
(4014KS-A) (4100KS-B)
Contacts Contacts
5 5
4 4
3 If a problem is found 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 Para. 3. for fault confirmation.
1 If the test does not give the acronym PTHWAF send the engine back to service.
2 If the test gives the fault acronym PTHWAF, remove and replace the RELAY
BOX ( 4100KS ) Ref. AMM 71-51-49-000-010 and Ref. AMM 71-51-49-400-010 .
3 If this fault continues, remove and replace the SENSOR-P2/T2 ( 4014KS ) 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 ( 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-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 wiring 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 (4100KS-E) 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 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 heater relay circuit in the relay box (4100KS) 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 other contacts in the connector.
3 If a problem is found, remove and replace the RELAY BOX ( 4100KS ) Ref.
AMM 71-51-49-000-010 and Ref. AMM 71-51-49-400-010 .
(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 heater relay 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 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.
Relay Box Heater Relay Circuit Channel B Harness
Relay Box (4100KS) EEC (4000KS)
(4100KS-E) (4000KS-J11)
Contacts Contacts
5 P
4 g
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(f) If no problems were found, visually examine the harness from the relay box connector (4100KSB)
to the P2/T2 sensor connector (4014KS-A) 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.
(g) If no problems were found, disconnect electrical connector (4014KS-A) from the P2/T2 sensor
(4014KS) 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.
(h) Do this electrical check of the P2/T2 sensor (4014KS) deicing circuit Ref. ASM 73-25-18:
1 Make sure that contacts 5 and 4 are not shorted to ground.
2 Make sure that contacts 5 and 4 are not shorted to other contacts in the connector.
3 Make sure that the resistance between pins 5 and 4 is between 10 and 28 ohms.
4 If a problem is found, remove and replace the SENSOR-P2/T2 ( 4014KS ) Ref.
AMM 73-22-11-000-010 and Ref. AMM 73-22-11-400-010 .
(i) If no problems were found, disconnect electrical connector (4100KS-B) 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 socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(j) Do this electrical check of the P2/T2 Sensor (4014KS) Deicing wiring. 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.
P2/T2 Sensor Deicing Circuit Harness
P2/T2 Sensor (4014KS) Relay Box (4100KS)
(4014KS-A) (4100KS-B)
Contacts Contacts
5 5
4 4
3 If a problem is found 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 Para. 3. for fault confirmation.
1 If the test does not give the fault acronym PTHWAF, send the engine back to service.
2 If the test gives the fault acronym PTHWAF, remove and replace the RELAY
BOX ( 4100KS ) Ref. AMM 71-51-49-000-010 and Ref. AMM 71-51-49-400-010 .
3 If this fault continues, remove and replace the SENSOR-P2/T2 ( 4014KS ) 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 ( 4000KS ) Ref.
AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
Subtask 73-00-00-810-260-A
B. Fault Isolation for Fault Acronym IGAWAF
A Wrap Around Fault (WAF) was found in channel A or B. The circuit for the relay box igniter A relay is
open, short 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 was found in channel A, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J3) 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 wiring 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 (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 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 igniter A relay circuit in the relay box (4100KS) 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 If a problem is found, remove and replace the RELAY BOX ( 4100KS ) Ref.
AMM 71-51-49-000-010 and Ref. AMM 71-51-49-400-010 .
(d) If no problems were found, disconnect electrical connector (4000KS-J3) 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 igniter A relay 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 it 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.
Relay Box Igniter A Relay Circuit Channel A Harness
Relay Box (4100KS) EEC (4000KS)
(4100KS-A) (4000KS-J3)
Contacts Contacts
6 N
7 M
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 IGAWAF send the engine back to service.
2 If the test gives the fault acronym IGAWAF, remove and replace RELAY BOX ( 4100KS )
Ref. AMM 71-51-49-000-010 and Ref. AMM 71-51-49-400-010 .
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-J9) 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 wiring 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 (4100KS-E) 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 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 igniter a relay circuit in the relay box (4100KS) 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 If a problem is found, remove and replace the RELAY BOX ( 4100KS ) Ref.
AMM 71-51-49-000-010 and Ref. AMM 71-51-49-400-010 .
(d) If no problems were found, disconnect electrical connector (4000KS-J9) 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 igniter A relay 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 it 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.
Relay Box Igniter A Relay Circuit Channel B Harness
Relay Box (4100KS) EEC (4000KS)
(4100KS-E) (4000KS-J9)
Contacts Contacts
6 N
7 M
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 IGAWAF send the engine back to service.
2 If the test gives the fault acronym IGAWAF, remove and replace RELAY BOX ( 4100KS )
Ref. AMM 71-51-49-000-010 and Ref. AMM 71-51-49-400-010 .
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 73-00-00-810-261-A
C. Fault Isolation for Fault Acronym IGBWAF
A Wrap Around Fault (WAF) was found in channel A or B. The circuit for the relay box igniter B relay is
open, short 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 was found in channel A, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J3) 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 wiring 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 (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 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 igniter B relay circuit in the relay box (4100KS) Ref.
ASM 73-25-18:
1 Make sure that contacts 9 and 8 are not shorted to ground.
2 Make sure that contacts 9 and 8 are not shorted to 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 71-51-49-400-010 .
(d) If no problems were found, disconnect electrical connector (4000KS-J3) 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 igniter B relay 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 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.
Relay Box Igniter B Relay Circuit Channel A Harness
Relay Box (4100KS) EEC (4000KS)
(4100KS-A) (4000KS-J3)
Contacts Contacts
9 R
8 g
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 IGBWAF send the engine back to service.
2 If the test gives the fault acronym IGBWAF, remove and replace the RELAY
BOX ( 4100KS ) Ref. AMM 71-51-49-000-010 and Ref. AMM 71-51-49-400-010 .
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-J9) 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 wiring 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 (4100KS-E) 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 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 igniter B relay circuit in the relay box (4100KS) Ref.
ASM 73-25-18:
1 Make sure that contacts 9 and 8 are not shorted to ground.
2 Make sure that contacts 9 and 8 are not shorted to 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 71-51-49-400-010 .
(d) If no problems were found, disconnect electrical connector (4000KS-J9) 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 igniter B relay 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 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.
Relay Box Igniter B Relay Circuit Channel B Harness
Relay Box (4100KS) EEC (4000KS)
(4100KS-E) (4000KS-J9)
Contacts Contacts
9 R
8 g
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 IGBWAF, send the engine back to service.
2 If the test gives the fault acronym IGBWAF, remove and replace the RELAY
BOX ( 4100KS ) Ref. AMM 71-51-49-000-010 and Ref. AMM 71-51-49-400-010 .
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 73-00-00-810-262-A
D. Fault Isolation for Fault Acronym PTHXCF
The P2/T2 probe heat discrete does not agree with the signal from the opposite channel. This crosscheck
fault (XCF) 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 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 wiring 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 (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 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 heater relay circuit in the relay box (4100KS) Ref. ASM
73-25-18:
1 Make sure that contacts 3 and 10 are not shorted to ground.
2 Make sure that contacts 3 and 10 are not shorted to 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 71-51-49-400-010 .
(d) If no problems were found, disconnect electrical connector (4000KS-J2) 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 heater relay 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 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.
Relay Box Heater Relay Circuit Channel A Harness
Relay Box (4100KS) EEC (4000KS)
(4100KS-A) (4000KS-J2)
Contacts Contacts
10 D
3 E
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(f) 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 wiring chafing.
4 If a problem is found with the harness, repair or replace as necessary.
(g) If no problems were found with the harness, disconnect electrical connector (4100KS-E) 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 socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(h) Do this electrical check of the channel B heater relay circuit in the relay box (4100KS) Ref. ASM
73-25-18:
1 Make sure that contacts 3 and 10 are not shorted to ground.
2 Make sure that contacts 3 and 10 are not shorted to 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 71-51-49-400-010 .
(i) If no problems were found, disconnect electrical connector (4000KS-J8) 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.
(j) Do this electrical check of the heater relay 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 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.
Relay Box Heater Relay Circuit Channel B Harness
Relay Box (4100KS) EEC (4000KS)
(4100KS-E) (4000KS-J8)
Contacts Contacts
10 D
3 E
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(k) If no problems were found, visually examine the harness from the relay box connector (4100KSB)
to the P2/T2 sensor connector (4014KS-A) 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.
(l) If no problems were found, disconnect electrical connector (4014KS-A) from the P2/T2 sensor
(4014KS) 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.
(m) Do this electrical check of the P2/T2 sensor (4014KS) deicing circuit Ref. ASM 73-25-18:
1 Make sure that contacts 5 and 4 are not shorted to ground.
2 Make sure that contacts 5 and 4 are not shorted to other contacts in the connector.
3 Make sure that the resistance between pins 5 and 4 is between 10 and 28 ohms.
4 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 .
(n) If no problems were found, disconnect electrical connector (4100KS-B) 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 socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(o) Do this electrical check of the P2/T2 Sensor Deicing wiring. 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.
P2/T2 Sensor Deicing Circuit Harness
P2/T2 Sensor (4014KS) Relay Box (4100KS)
(4014KS-A) (4100KS-B)
Contacts Contacts
P2/T2 Sensor Deicing Circuit Harness
P2/T2 Sensor (4014KS) Relay Box (4100KS)
5 5
4 4
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(p) Install all removed connectors Ref. AMM 70-23-15-912-010 .
(q) Do the test for this fault, listed in Para. 3. for fault confirmation.
1 If the test does not give the fault acronym PTHXCF send the engine back to service.
2 If the test gives the fault acronym PTHXCF, remove and replace the RELAY
BOX ( 4100KS ) Ref. AMM 71-51-49-000-010 and Ref. AMM 71-51-49-400-010 .
3 If this fault continues, remove and replace the SENSOR-P2/T2 ( 4014KS ) 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 ( 4000KS ) Ref.
AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
5. Close-up
Subtask 73-00-00-860-089-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 ENG section of the maintenance panel 50VU, push the 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 04:36:05 UTC