DOC AIRBUS | TSM A320FIgnition/Exciter #1 Failure
TASK 74-00-00-810-831-A
Ignition/Exciter #1 Failure
1. Possible Causes
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 74-00-00-710-134-A ** ON A/C NOT FOR ALL
Subtask 74-00-00-860-076-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:40:43 UTC
Ignition/Exciter #1 Failure
1. Possible Causes
- IGNITION EXCITER [4000JH]
- W04 HARNESS [4088KS]
- HARNESS-FAN, WF02 [4218KS]
- IGNITION CABLE 1 [4038JH]
- IGNITER-1 [4036JH]
[4000KS] - W03 HARNESS [4087KS]
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | MULTIMETER - STANDARD |
| No specific | 1 | PLIERS - JAWED, SOFT |
| No specific | 1 | VOLTMETER - AC, 0-20 V MIN, 0,001 V, 50 TO 2000 HTZ |
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 71-00-00-810-834-A | General Troubleshooting Guidelines for Additional Troubleshooting Information |
| TSM TASK 71-00-00-810-835-A | Component and Harness Intermittent Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults |
| TSM TASK 71-00-00-810-850-A | Troubleshoot the Engine after a No Light - No/Low Fuel Flow event |
| TSM TASK 71-00-00-810-851-A | Troubleshoot the Engine after a No Light with Correct Fuel Flow event |
| AMM 70-70-00-910-803 | SPOP 6 - Cleaning of the Contact Points and Wiring Harnesses |
| AMM 71-00-00-860-822 | Start the Engine (Normal Manual Start) |
| AMM 71-00-00-860-823 | Start the Engine (Normal Automatic Start) |
| AMM 73-21-01-000-801 | Removal of the Electronic Engine Control (EEC) |
| AMM 73-21-01-400-801 | Installation of the Electronic Engine Control (EEC) |
| AMM 73-21-62-000-802 | Removal of the EEC Wiring Harness (WF02) |
| AMM 73-21-62-400-802 | Installation of the EEC Wiring Harness (WF02) |
| AMM 73-21-63-000-802 | Removal of the Electronic Engine Control (EEC) Wiring Harness (W03) |
| AMM 73-21-63-400-802 | Installation of the Electronic Engine Control (EEC) Wiring Harness (W03) |
| AMM 73-21-64-000-802 | Removal of the Electronic Engine Control (EEC) Wiring Harness (W04) |
| AMM 73-21-64-400-802 | Installation of the Electronic Engine Control (EEC) Wiring Harness (W04) |
| AMM 73-25-34-710-802 | Operational Test of the Engine Interface Unit (EIU) with the Centralized Fault Display System (CFDS) |
| AMM 74-00-00-210-801 | General Visual Inspection (GVI) of the Ignition System |
| AMM 74-00-00-710-802 | Operational Test of the Ignition System with the CFDS |
| AMM 74-11-01-000-801 | Removal of the Ignition Exciter |
| AMM 74-11-01-400-801 | Installation of the Ignition Exciter |
| AMM 74-21-01-000-801 | Removal of the Igniter Plug |
| AMM 74-21-01-400-801 | Installation of the Igniter Plug |
| AMM 74-21-61-000-802 | Removal of the Ignition Cables |
| AMM 74-21-61-400-802 | Installation of the Ignition Cables |
| AWM 743101 | |
| AWM 743102 | |
| AMM 78-36-00-010-802 | Opening of the Thrust Reverser Cowl-Doors |
| AMM 78-36-00-410-802 | Closing of the Thrust Reverser Cowl-Doors |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1) | |
| AWM 743101 | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2) | |
| AWM 743102 | |
EEC Wiring HarnessSubtask 74-00-00-710-134-A ** ON A/C NOT FOR ALL
A. Do the FADEC system ignition system test to confirm a problem with the ignition system A AMM 74-00-00-710-802. Run the test for ignition system A in both channel A and channel B.
(a) If the fuel flow was OK, do the procedure for no light-correct fuel flow (Ref. TSM TASK 71-00-00-810-851).
(b) If the fuel flow was not OK, do the procedure for no light no or low fuel flow (Ref. TSM TASK 71-00-00-810-850).
(2) If an audible indication of spark was not heard during the FADEC system ignition test, continue with the steps in the troubleshooting procedure.
4. Fault IsolationNOTE: The Electronic Engine Control (EEC) in channel A and channel B has detected that the engine has failed to light using ignition system A. The ignition system alternates at the beginning of each engine auto start in the following sequence: Start 1- Ignition System A, Channel A, Start 2 - Ignition System A, Channel B, Start 3 - Ignition System B, Channel A, Start 4 - Ignition System B Channel B. The ignition exciter is located on the right side of the fan case at approximately 5 o'clock position.
(1) If a dual EEC channel maintenance message for ignition system A failure comes on with a dual EEC channel maintenance message for ignition system B failure, check to make sure that the fuel flow is OK. - Refer to the general troubleshooting guidelines for additional troubleshooting information (Ref. TSM TASK 71-00-00-810-834).
- Refer to the component and harness intermittent troubleshooting procedure for guidance troubleshooting intermittent fault (Ref. TSM TASK 71-00-00-810-835).
(a) If the fuel flow was OK, do the procedure for no light-correct fuel flow (Ref. TSM TASK 71-00-00-810-851).
(b) If the fuel flow was not OK, do the procedure for no light no or low fuel flow (Ref. TSM TASK 71-00-00-810-850).
(2) If an audible indication of spark was not heard during the FADEC system ignition test, continue with the steps in the troubleshooting procedure.
WARNING:
IGNITION SYSTEM VOLTAGE IS DANGEROUSLY HIGH. THE IGNITION SWITCH MUST BE IN THE "OFF" POSITION BEFORE REMOVING OR INSTALLING ANY IGNITION COMPONENTS. AFTER DISCONNECTING CABLE FROM IGNITER PLUG, DISCHARGE CURRENT BY GROUNDING IGNITION CABLE TERMINAL TO ENSURE COMPLETE DISSIPATION OF ENERGY FROM THE SYSTEM. FAILURE TO FOLLOW THIS PROCEDURE COULD RESULT IN SEVERE INJURY TO PERSONNEL.
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.
WARNING:
REFER TO THE MSDS FOR ALL MATERIAL USED AND THE MANUFACTURER'S SAFETY INSTRUCTIONS FOR ALL EQUIPMENT USED. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.
CAUTION:
MAKE SURE YOU REMOVE ELECTRICAL POWER FROM THE EEC BEFORE YOU REMOVE THE ELECTRICAL CONNECTORS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EEC CAN OCCUR.
Subtask 74-00-00-810-109-A ** ON A/C NOT FOR ALL A. Do the steps that follow:
(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Do a general visual inspection of the ignition system AMM 74-00-00-210-801 and fix any problems that you find.
(a) Do the test given in Para. 4.B.
(b) If the fault comes back, go to the next step.
(3) Make sure that 115VAC is available at the ignition exciter (4000JH) connector P67 (4000JH-P67).
(a) Use a PLIERS - JAWED, SOFT to disconnect the connector P67 (4000JH-P67) from the ignition exciter (4000JH).
(b) Connect a VOLTMETER - AC, 0-20 V MIN, 0,001 V, 50 TO 2000 HTZ across connector P67 (4000JH-P67) contacts 2 and 3.
(c) Do the FADEC system ignition test on the MCDU for ignition system A AMM 74-00-00-710-802 and look for 115VAC.
1 If 115 VAC is available, replace IGNITION EXCITER [4000JH] AMM 74-11-01-000-801 and AMM 74-11-01-400-801.
a Do the test given in Para. 4.B.
b If the fault comes back go to the Para. 4.A.(3)(c)4_a_.
2 If 115 VAC is not available: disconnect the connector at J102 (4104VC)/P102 (4104VC-A) interface. Connect the VOLTMETER - AC, 0-20 V MIN, 0,001 V, 50 TO 2000 HTZ to J102 (4104VC) connector pins 1 and 2.
Do the FADEC system ignition test on the MCDU for ignition system A AMM 74-00-00-710-802 and look for 115 VAC.
a If 115VAC is available, replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
b Do the test given in Para. 4.B.
c If 115VAC is not available, go to the next step.
3 Look for 115 VAC at the P402 (402VC-A) fan pylon junction box. Connect a VOLTMETER - AC, 0-20 V MIN, 0,001 V, 50 TO 2000 HTZ across connector P402 (402VC-A) fan pylon junction box, pins 31 and 32.
Do the FADEC system ignition test on the MCDU for ignition system A AMM 74-00-00-710-802.
a If 115 VAC was not available, continue to look at the aircraft power supply and wiring for problems:
b FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
AWM 743101.
c FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
AWM 743102.
d If 115 VAC was available, replace HARNESS-FAN, WF02 [4218KS] AMM 73-21-62-000-802 and AMM 73-21-62-400-802.
e Do the test given in Para. 4.B.
4 If the fault continues:
a Replace IGNITION CABLE 1 [4038JH] for ignition system A AMM 74-21-61-000-802 and AMM 74-21-61-400-802.
b Do the test given in Para. 4.B.
c If the fault comes back go to the next step.
5 If the fault continues:
a Replace IGNITER-1 [4036JH] for ignition system A AMM 74-21-01-000-801 and AMM 74-21-01-400-801.
b Do the test given in Para. 4.B.
c If the fault comes back go to the next step.
6 If the fault continues:
a Replace IGNITION EXCITER [4000JH] AMM 74-11-01-000-801 and AMM 74-11-01-400-801.
b Do the test given in Para. 4.B.
c If the fault comes back go to the next step.
(4) If the fault comes back when the ignition system A is controlled by EEC channel A:
(a) Examine the W04 (4088KS) harness from connector P13 (4000KS-P13) on the EEC (4000KS) to the connector P67 (4000JH-P67) on the exciter (4000JH) for problems.
If the fault comes back when the ignition system A is controlled by channel B, go to the Para. 4.(4)(c).
1 Inspect for harness damage.
2 Inspect for loose or damaged connectors.
a Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
b Do the test given in Para. 4.B.
(b) If no problems are found with the W04 (4088KS) harness, disconnect electrical connector P67 (4000JH-P67) from the exciter (4000JH) and connector P13 (4000KS-P13) from the EEC (4000KS).
1 Examine the pins, sockets (contacts) and lugs for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
2 Clean the contacts with contact cleaner and clean cloth per SPOP 6. Blow dry with air (at less than 30 psi) across connector face AMM 70-70-00-910-803.
3 Reconnect the electrical connector P67 (4000JH-P67) to the exciter (4000JH) and P13 (4000KS-P13) to the EEC (4000KS).
4 Do the test given in Para. 4.B.
(c) If the fault continues:
1 Disconnect the electrical connector P67 (4000JH-P67) from the exciter (4000JH) and connector P13 (4000KS-P13) from the EEC (4000KS). Use a MULTIMETER - STANDARD to test the FADEC exciter command and return circuits in the harness. Refer to Table 1. Look for:
a Wire-to-wire shorts
b Shorts to ground
c Continuity (less than 5 ohms resistance).
(d) If a problem is found with the harness or connectors:
1 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
2 Do the test given in Para. 4.B.
(e) If the fault continues:
1 Replace
2 Do the test given in Para. 4.B.
(5) If the fault comes back when the ignition system A is controlled by EEC channel B:
(a) Examine the W03 (4087KS) harness from connector P14 (4000KS-P14) on the EEC (4000KS) to the connector P66 (4000JH-P66) on the exciter (4000JH) for problems.
1 Inspect for harness damage.
2 Inspect for loose or damaged connectors.
a Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
b Do the test given in Para. 4.B.
(b) If no problems are found with the W03 (4087KS) harness, disconnect electrical connector P66 (4000JH-P66) from the exciter (4000JH) and connector P14 (4000KS-P14) from the EEC (4000KS).
1 Examine the pins, sockets (contacts) and lugs for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
2 Clean the contacts with contact cleaner and clean cloth per SPOP 6. Blow dry with air (at less than 30 psi) across connector face AMM 70-70-00-910-803.
3 Reconnect the electrical connector P66 (4000JH-P66) to the exciter (4000JH) and P14 (4000KS-P14) to the EEC (4000KS).
4 Do the test given in Para. 4.B.
(c) If the fault continues:
1 Disconnect the electrical connector P66 (4000JH-P66) from the exciter (4000JH) and connector P14 (4000KS-P14) from the EEC (4000KS). Use a MULTIMETER - STANDARD to test the ignition system A FADEC exciter command and return circuits in the harness. Refer to Table 2. Look for:
a Wire-to-wire shorts
b Shorts to ground
c Continuity (less than 5 ohms resistance).
(d) If a problem is found with the harness or connectors:
1 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
2 Do the test given in Para. 4.B.
(a) Troubleshoot all maintenance messages for ignition power supply failure or engine start/stop failure.
1 Do the test given in Para. 4.B.
(b) If there is no maintenance message or if the fault continues, repair or replace aircraft wiring:
1 For ENG 1 fault:
Refer to AWM 743101.
2 For ENG 2 fault:
Refer to AWM 743102.
3 Do the test given in Para. 4.B.
(c) If the fault continues:
1 Return to the Para. 4.A.(3)(c)3_d_.
(d) If the fault continues:
1 Replace
2 Do the test given in Para. 4.B.
Subtask 74-00-00-710-136-A ** ON A/C NOT FOR ALL (1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Do a general visual inspection of the ignition system AMM 74-00-00-210-801 and fix any problems that you find.
(a) Do the test given in Para. 4.B.
(b) If the fault comes back, go to the next step.
(3) Make sure that 115VAC is available at the ignition exciter (4000JH) connector P67 (4000JH-P67).
(a) Use a PLIERS - JAWED, SOFT to disconnect the connector P67 (4000JH-P67) from the ignition exciter (4000JH).
(b) Connect a VOLTMETER - AC, 0-20 V MIN, 0,001 V, 50 TO 2000 HTZ across connector P67 (4000JH-P67) contacts 2 and 3.
(c) Do the FADEC system ignition test on the MCDU for ignition system A AMM 74-00-00-710-802 and look for 115VAC.
1 If 115 VAC is available, replace IGNITION EXCITER [4000JH] AMM 74-11-01-000-801 and AMM 74-11-01-400-801.
a Do the test given in Para. 4.B.
b If the fault comes back go to the Para. 4.A.(3)(c)4_a_.
2 If 115 VAC is not available: disconnect the connector at J102 (4104VC)/P102 (4104VC-A) interface. Connect the VOLTMETER - AC, 0-20 V MIN, 0,001 V, 50 TO 2000 HTZ to J102 (4104VC) connector pins 1 and 2.
Do the FADEC system ignition test on the MCDU for ignition system A AMM 74-00-00-710-802 and look for 115 VAC.
a If 115VAC is available, replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
b Do the test given in Para. 4.B.
c If 115VAC is not available, go to the next step.
3 Look for 115 VAC at the P402 (402VC-A) fan pylon junction box. Connect a VOLTMETER - AC, 0-20 V MIN, 0,001 V, 50 TO 2000 HTZ across connector P402 (402VC-A) fan pylon junction box, pins 31 and 32.
Do the FADEC system ignition test on the MCDU for ignition system A AMM 74-00-00-710-802.
a If 115 VAC was not available, continue to look at the aircraft power supply and wiring for problems:
b FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
AWM 743101.
c FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
AWM 743102.
d If 115 VAC was available, replace HARNESS-FAN, WF02 [4218KS] AMM 73-21-62-000-802 and AMM 73-21-62-400-802.
e Do the test given in Para. 4.B.
4 If the fault continues:
a Replace IGNITION CABLE 1 [4038JH] for ignition system A AMM 74-21-61-000-802 and AMM 74-21-61-400-802.
b Do the test given in Para. 4.B.
c If the fault comes back go to the next step.
5 If the fault continues:
a Replace IGNITER-1 [4036JH] for ignition system A AMM 74-21-01-000-801 and AMM 74-21-01-400-801.
b Do the test given in Para. 4.B.
c If the fault comes back go to the next step.
6 If the fault continues:
a Replace IGNITION EXCITER [4000JH] AMM 74-11-01-000-801 and AMM 74-11-01-400-801.
b Do the test given in Para. 4.B.
c If the fault comes back go to the next step.
(4) If the fault comes back when the ignition system A is controlled by EEC channel A:
(a) Examine the W04 (4088KS) harness from connector P13 (4000KS-P13) on the EEC (4000KS) to the connector P67 (4000JH-P67) on the exciter (4000JH) for problems.
If the fault comes back when the ignition system A is controlled by channel B, go to the Para. 4.(4)(c).
1 Inspect for harness damage.
2 Inspect for loose or damaged connectors.
NOTE: Loose connectors must be disconnected and examined for further wear or damage.
3 If a problem is found with the harness or connectors: a Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
b Do the test given in Para. 4.B.
(b) If no problems are found with the W04 (4088KS) harness, disconnect electrical connector P67 (4000JH-P67) from the exciter (4000JH) and connector P13 (4000KS-P13) from the EEC (4000KS).
1 Examine the pins, sockets (contacts) and lugs for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
2 Clean the contacts with contact cleaner and clean cloth per SPOP 6. Blow dry with air (at less than 30 psi) across connector face AMM 70-70-00-910-803.
3 Reconnect the electrical connector P67 (4000JH-P67) to the exciter (4000JH) and P13 (4000KS-P13) to the EEC (4000KS).
4 Do the test given in Para. 4.B.
(c) If the fault continues:
1 Disconnect the electrical connector P67 (4000JH-P67) from the exciter (4000JH) and connector P13 (4000KS-P13) from the EEC (4000KS). Use a MULTIMETER - STANDARD to test the FADEC exciter command and return circuits in the harness. Refer to Table 1. Look for:
a Wire-to-wire shorts
b Shorts to ground
c Continuity (less than 5 ohms resistance).
NOTE: A short to ground is found when the resistance is less than 100 000 (100K) ohms.
Table 1: Ignition System A Channel A Contacts | W04 (4088KS) Harness P13 (4000KS-P13) EEC (4000KS) Connector Contacts | W04 Harness (4088KS) P67(4000JH-P67) Exciter (4000JH) Connector Contacts |
|---|---|
| w | 4 |
| HH | 5 |
1 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
2 Do the test given in Para. 4.B.
(e) If the fault continues:
1 Replace
2 Do the test given in Para. 4.B.
(5) If the fault comes back when the ignition system A is controlled by EEC channel B:
(a) Examine the W03 (4087KS) harness from connector P14 (4000KS-P14) on the EEC (4000KS) to the connector P66 (4000JH-P66) on the exciter (4000JH) for problems.
1 Inspect for harness damage.
2 Inspect for loose or damaged connectors.
NOTE: Loose connectors must be disconnected and examined for further wear or damage.
3 If a problem is found with the harness or connectors: a Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
b Do the test given in Para. 4.B.
(b) If no problems are found with the W03 (4087KS) harness, disconnect electrical connector P66 (4000JH-P66) from the exciter (4000JH) and connector P14 (4000KS-P14) from the EEC (4000KS).
1 Examine the pins, sockets (contacts) and lugs for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
2 Clean the contacts with contact cleaner and clean cloth per SPOP 6. Blow dry with air (at less than 30 psi) across connector face AMM 70-70-00-910-803.
3 Reconnect the electrical connector P66 (4000JH-P66) to the exciter (4000JH) and P14 (4000KS-P14) to the EEC (4000KS).
4 Do the test given in Para. 4.B.
(c) If the fault continues:
1 Disconnect the electrical connector P66 (4000JH-P66) from the exciter (4000JH) and connector P14 (4000KS-P14) from the EEC (4000KS). Use a MULTIMETER - STANDARD to test the ignition system A FADEC exciter command and return circuits in the harness. Refer to Table 2. Look for:
a Wire-to-wire shorts
b Shorts to ground
c Continuity (less than 5 ohms resistance).
NOTE: A short to ground is found when the resistance is less than 100 000 (100K) ohms.
Table 2: Ignition System A Channel B Contacts | W03 (4087KS) Harness P14 (4000KS-P14) EEC (4000KS) Connector Contacts | W03 Harness (4087KS) P66(4000JH-P66) Exciter (4000JH) Connector Contacts |
|---|---|
| w | 6 |
| HH | 1 |
1 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
2 Do the test given in Para. 4.B.
- If the fault continues, go to the Para. 4.A.(6)
(a) Troubleshoot all maintenance messages for ignition power supply failure or engine start/stop failure.
1 Do the test given in Para. 4.B.
(b) If there is no maintenance message or if the fault continues, repair or replace aircraft wiring:
1 For ENG 1 fault:
Refer to AWM 743101.
2 For ENG 2 fault:
Refer to AWM 743102.
3 Do the test given in Para. 4.B.
(c) If the fault continues:
1 Return to the Para. 4.A.(3)(c)3_d_.
(d) If the fault continues:
1 Replace
2 Do the test given in Para. 4.B.
B. Repair Confirmation
(1) Do an engine start with ignition system A in channel A and ignition system A in channel B to confirm the repair of this fault AMM 71-00-00-860-822 or AMM 71-00-00-860-823. You may need to do four consecutive engine starts to do this task. Use the information in the Fault Confirmation section of this procedure to help determine the ignition system sequence.
5. Close-up(1) Do an engine start with ignition system A in channel A and ignition system A in channel B to confirm the repair of this fault AMM 71-00-00-860-822 or AMM 71-00-00-860-823. You may need to do four consecutive engine starts to do this task. Use the information in the Fault Confirmation section of this procedure to help determine the ignition system sequence.
Subtask 74-00-00-860-076-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the thrust reverser cowl-doors AMM 78-36-00-410-802.
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the thrust reverser cowl-doors AMM 78-36-00-410-802.