DOC AIRBUS | TSM A320FStart Data Failure (linked to Master Lever)
TASK 73-21-00-810-904-A
Start Data Failure (linked to Master Lever)
1. Possible Causes
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 73-21-00-710-154-A ** ON A/C NOT FOR ALL
Subtask 73-21-00-860-093-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:36:42 UTC
Start Data Failure (linked to Master Lever)
1. Possible Causes
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | MULTIMETER - STANDARD |
| No specific | 1 | PLIERS - JAWED, SOFT |
| 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 |
| AMM 70-70-00-910-803 | SPOP 6 - Cleaning of the Contact Points and Wiring Harnesses |
| AMM 71-13-00-010-802 | Opening of the Fan Cowl Doors |
| AMM 73-21-00-710-806 | Test No.7 - EEC Operation Test (Self Test) |
| 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 73-21-61-000-802 | Removal of the Electronic Engine Control (EEC) Wiring Harness (WF01) |
| AMM 73-21-61-400-802 | Installation of the Electronic Engine Control (EEC) Wiring Harness (WF01) |
| 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 73-25-34-710-802 | Operational Test of the Engine Interface Unit (EIU) with the Centralized Fault Display System (CFDS) |
| AWM 732538 | |
| AWM 732539 | |
| AMM 78-36-00-410-802 | Closing of the Thrust Reverser Cowl-Doors |
Subtask 73-21-00-710-154-A ** ON A/C NOT FOR ALL
A. Energize the FADEC of the engine that has a fault report.
(1) On the ENG section of maintenance panel 50VU:
(a) Release the FADEC GND PWR/1(2) pushbutton switch (the ON legend comes on).
4. Fault Isolation(1) On the ENG section of maintenance panel 50VU:
(a) Release the FADEC GND PWR/1(2) pushbutton switch (the ON legend comes on).
NOTE: After the FADEC is energized, wait ten seconds before you start the test. If you do not wait ten seconds, the interactive mode stops the EEC self-test and this can cause spurious faults.
(2) On MCDU screen, check if the fault is displayed on ground scanning report. NOTE: The Electronic Engine Control (EEC) has detected a start data fail in channel A and channel B. The start data fail is set when the ignition rotary start switch or Master Lever switch positions are invalid. The EEC is located on the fan case at the 2 o'clock position.
- 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 faults (Ref. TSM TASK 71-00-00-810-835).
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 73-21-00-810-173-A ** ON A/C NOT FOR ALL A. Do the steps that follow:
(1) Check the ENG/MODE rotary selector switch, ENG MASTER 1(2) switch and ARINC link between EIU (1KS) and EEC (4000KS).
1 Check for any maintenance messages for START/STOP fault, START fault or EIU BUS E fault.
2 If any maintenance messages are found, troubleshoot those faults first.
(b) Do the EEC system interactive test to confirm this fault. Refer to FADEC self test AMM 73-21-00-710-806.
1 Check for any maintenance messages for EIU Bus Data Failure.
2 If any maintenance messages are found, troubleshoot those faults.
(2) Open the fan cowl doors AMM 71-13-00-010-802.
(3) If no problems are found or the fault continues, do a check of engine wiring as follows:
(a) Examine the WF02 (4218KS) and WF01 (4217KS) harnesses, connectors P1 (4000KS-P1) and P2 (4000KS-P2) - EEC (4000KS) and connectors P406 (406VC-A) and P407 (407VC-A) - Pylon junction box, for problems which are possible between the EEC (4000KS) and the pylon junction box.
1 Inspect for harnesses damage.
2 Inspect for loose or damaged connectors.
1 Replace WF02 HARNESS-FAN(4218KS) AMM 73-21-62-000-802 and AMM 73-21-62-400-802, or
2 Replace WF01 HARNESS-FAN(4217KS) AMM 73-21-61-000-802 and AMM 73-21-61-400-802.
3 Do the test given in the Para. 4.B.
(4) If no problems are found with the harnesses or the fault continues, use a PLIERS - JAWED, SOFT to disconnect the electrical connectors P1 (4000KS-P1) and P2 (4000KS-P2) from the EEC (4000KS) and connectors P406 (406VC-A) and P407 (407VC-A) from the pylon junction box.
(a) Examine the pins and sockets (contacts) for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
(b) 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.
(c) Reconnect the electrical connectors P1 (4000KS-P1) and P2 (4000KS-P2) to the EEC (4000KS) and connectors P406 (406VC-A) and P407 (407VC-A) to the pylon junction box.
(d) Do the test given in the Para. 4.B.
(5) If the fault continues:
(a) Disconnect the electrical connectors P1 (4000KS-P1) and P2 (4000KS-P2) from the EEC (4000KS) and connectors P406 (406VC-A) and P407 (407VC-A) from the pylon junction box. Use a MULTIMETER - STANDARD to test the Master Lever hardwire discrete circuits in the harnesses. Refer to Table 1 and Table 2. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 Continuity (less than 5 ohms resistance).
Table 2: Master Lever Channel B Connector Contacts
(b) If a problem is found with the harnesses or connectors:
1 Replace the HARNESS-FAN, WF02 [4218KS] AMM 73-21-62-000-802 and AMM 73-21-62-400-802, or
2 Replace the HARNESS-FAN, WF01 [4217KS] AMM 73-21-61-000-802 and AMM 73-21-61-400-802.
3 Do the test given in the Para. 4.B.
(6) If no problems are found or the fault continues:
(a) Do a check of the aircraft wiring between the ENG MASTER switch 3KC(2KC) and pylon junction box (406VC-A) and (407VC-A). For ENG 1, refer to AWM 732539 and for ENG 2, refer to AWM 732538. Refer to Table 3 and Table 4. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 Continuity (less than 5 ohms resistance).
Table 4: Master Lever to Pylon Channel B Connector Contacts
4 Repair any problems found.
5 Do the test given in the Para. 4.B.
(7) If the fault continues:
(a) Replace
(b) Do the test given in the Para. 4.B.
5. Close-up(1) Check the ENG/MODE rotary selector switch, ENG MASTER 1(2) switch and ARINC link between EIU (1KS) and EEC (4000KS).
NOTE: Check for EIU-1 (1KS1) if fault is on ENG 1 and EIU-2 (1KS2) if the fault is on ENG 2.
(a) Do the operational test of the Engine Interface Unit (EIU) with the Centralized Fault Display System (CFDS) AMM 73-25-34-710-802. 1 Check for any maintenance messages for START/STOP fault, START fault or EIU BUS E fault.
2 If any maintenance messages are found, troubleshoot those faults first.
(b) Do the EEC system interactive test to confirm this fault. Refer to FADEC self test AMM 73-21-00-710-806.
1 Check for any maintenance messages for EIU Bus Data Failure.
2 If any maintenance messages are found, troubleshoot those faults.
(2) Open the fan cowl doors AMM 71-13-00-010-802.
(3) If no problems are found or the fault continues, do a check of engine wiring as follows:
(a) Examine the WF02 (4218KS) and WF01 (4217KS) harnesses, connectors P1 (4000KS-P1) and P2 (4000KS-P2) - EEC (4000KS) and connectors P406 (406VC-A) and P407 (407VC-A) - Pylon junction box, for problems which are possible between the EEC (4000KS) and the pylon junction box.
1 Inspect for harnesses damage.
2 Inspect for loose or damaged connectors.
NOTE: Loose connectors must be disconnected and examined for further wear or damage.
(b) If a problem is found with the harnesses or connectors: 1 Replace WF02 HARNESS-FAN(4218KS) AMM 73-21-62-000-802 and AMM 73-21-62-400-802, or
2 Replace WF01 HARNESS-FAN(4217KS) AMM 73-21-61-000-802 and AMM 73-21-61-400-802.
3 Do the test given in the Para. 4.B.
(4) If no problems are found with the harnesses or the fault continues, use a PLIERS - JAWED, SOFT to disconnect the electrical connectors P1 (4000KS-P1) and P2 (4000KS-P2) from the EEC (4000KS) and connectors P406 (406VC-A) and P407 (407VC-A) from the pylon junction box.
(a) Examine the pins and sockets (contacts) for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
(b) 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.
(c) Reconnect the electrical connectors P1 (4000KS-P1) and P2 (4000KS-P2) to the EEC (4000KS) and connectors P406 (406VC-A) and P407 (407VC-A) to the pylon junction box.
(d) Do the test given in the Para. 4.B.
(5) If the fault continues:
(a) Disconnect the electrical connectors P1 (4000KS-P1) and P2 (4000KS-P2) from the EEC (4000KS) and connectors P406 (406VC-A) and P407 (407VC-A) from the pylon junction box. Use a MULTIMETER - STANDARD to test the Master Lever hardwire discrete circuits in the harnesses. Refer to Table 1 and Table 2. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 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: Master Lever Channel A Connector Contacts | WF02 (4218KS) Harness P1 (4000KS-P1) EEC (4000KS) Connector Contacts | WF02 (4218KS) Harness P406 (406VC-A) Pylon Junction Box Connector Contacts |
|---|---|
| EE | 2 |
| DD | 9 |
| WF01 (4217KS) Harness P2 (4000KS-P2) EEC (4000KS) Connector Contacts | WF01 (4217KS) Harness P407 (407VC-A) Pylon Junction Box Connector Contacts |
|---|---|
| EE | 2 |
| DD | 9 |
1 Replace the HARNESS-FAN, WF02 [4218KS] AMM 73-21-62-000-802 and AMM 73-21-62-400-802, or
2 Replace the HARNESS-FAN, WF01 [4217KS] AMM 73-21-61-000-802 and AMM 73-21-61-400-802.
3 Do the test given in the Para. 4.B.
(6) If no problems are found or the fault continues:
(a) Do a check of the aircraft wiring between the ENG MASTER switch 3KC(2KC) and pylon junction box (406VC-A) and (407VC-A). For ENG 1, refer to AWM 732539 and for ENG 2, refer to AWM 732538. Refer to Table 3 and Table 4. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 Continuity (less than 5 ohms resistance).
NOTE: A short to ground is found when the resistance is less than 100 000 (100K) ohms.
Table 3: Master Lever to Pylon Channel A Connector Contacts | Pylon Junction Box (406VC-A) Connector Contacts | ENG MASTER switch 3KC(2KC) Connector Contacts |
|---|---|
| 2 | 1C |
| 9 | 3C |
Table 4: Master Lever to Pylon Channel B Connector Contacts
| Pylon Junction Box (407VC-A) Connector Contacts | ENG MASTER switch 3KC(2KC) Connector Contacts |
|---|---|
| 2 | 3E |
| 9 | 1E |
5 Do the test given in the Para. 4.B.
(7) If the fault continues:
(a) Replace
(b) Do the test given in the Para. 4.B.
Subtask 73-21-00-860-093-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.