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NAI Pushbutton-Switch-Command Digital-Signal from the EIU Failure on Channel A

TASK 30-21-00-810-834-A
NAI Pushbutton-Switch-Command Digital-Signal from the EIU Failure on Channel A

1. Possible Causes
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
No specific
1
PLIERS - JAWED, SOFT
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
No specific
1
PLIERS - JAWED, SOFT
 B. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 71-00-00-810-835-A
Component and Harness Intermittent Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults
AMM 24-41-00-861-002
Energize the Aircraft Electrical Circuits from the External Power
AMM 31-32-00-860-012
Procedure to Get Access to the SYSTEM REPORT/TEST/ENG Page
AMM 31-60-00-860-001
EIS Start Procedure
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
ESPM 204511
ASM 302101
AWM 715135
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)
AWM 732527
AMM 73-25-34-000-802
Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-802
Installation of the Engine Interface Unit (EIU)
AMM 73-25-34-860-806
Engine Interface Unit (EIU) DISCRETE INPUTS Menu Data Status
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
ESPM 204511
ASM 302102
AWM 715135
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)
AWM 732526
AMM 73-25-34-000-802
Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-802
Installation of the Engine Interface Unit (EIU)
AMM 73-25-34-860-806
Engine Interface Unit (EIU) DISCRETE INPUTS Menu Data Status
3. Fault Confirmation
Subtask 30-21-00-730-070-A ** ON A/C NOT FOR ALL
A. Test
   (1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
   (2) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) AMM 31-60-00-860-001.
   (3) In the cockpit, on the overhead control and indicator panel, on the ANTI ICE section, push the ENG1(2) pushbutton switch (the ON legend comes on).
   (4) Wait three seconds.
   (5) On the overhead control and indicator panel, on the ANTI ICE section, release the ENG1(2) pushbutton switch (the ON legend goes off).
   (6) On the MCDU screen, get access to the SYSTEM REPORT/TEST/ENG menu page AMM 31-32-00-860-012.
     (a) On the SYSTEM REPORT/TEST/ENG menu page, push the line key adjacent to the FADEC 1(2) A indication.
EEC 1(2) CHAN A page comes into view.
     (b) Push the line key adjacent to the GND SCANNING indication, the GROUND SCANNING menu page comes into view.
       1 If there is a maintenance message, go to the Para. Fault Isolation.
       2 If the maintenance message does not come into view again, do the component and harness intermittent for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-835).
         a If you find no fault, send the engine back to service.
Monitor the engine to make sure that the maintenance message does not come into view again.
4. Fault Isolation
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.
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 30-21-00-810-082-A ** ON A/C NOT FOR ALL
A. If there is confirmation of the fault:
   (1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
     (a) If there is a fault when you release and/or push the ANTI ICE/GEN1 pushbutton switch:
  • Remove EIU1 AMM 73-25-34-000-802.
  • Do a continuity check of the wiring ASM 302101 between:
    . Pin A/B2 of the ANTI ICE/ENG 1 pushbutton switch (2DN1) and pin AA/5C of EIU1
    . Pin A/B1 of the ANTI ICE/ENG 1 pushbutton switch (2DN1) and pin AA/4A of EIU2.
       1 If there is no continuity:
       2 If there is continuity:
  • Replace the P/BSW-ANTI ICE/ENG 1 [2DN1] ESPM 204511.
  • Do the test given in Para. 3.
         a If the fault continues:
     (b) If there is no fault when you release and/or push the ANTI ICE/GEN1 pushbutton switch:
  • Remove EIU1 AMM 73-25-34-000-802.
  • Use PLIERS - JAWED, SOFT to disconnect electrical connector P1 of the EEC and do a continuity check of the wiring AWM 732527 and AWM 715135 between:
    . Pin AA/11K of EIU1 and pin P1/c of the EEC
    . Pin AA/12K of EIU1 and pin P1/B of the EEC.
       1 If there is no continuity:
  • Do a continuity check of the wiring AWM 732527 between:
    . Pin AA/11K of EIU1 and pin 36 of 402VC1
    . Pin AA/12K of EIU1 and pin 18 of 402VC1.
         a If there is no continuity:
  • Repair the wiring.
  • Do the test given in Para. 3.
         b If there is continuity:
  • Do a continuity check of the WF02 fan harness AWM 715135 between:
    . Pin 36 of 402VC1 and pin P1/c of the EEC
    . Pin 18 of 402VC1 and pin P1/B of the EEC.
    * If there is no continuity:
    * Replace the HARNESS-FAN, WF02 [4218KS] AMM 73-21-62-000-802 and AMM 73-21-62-400-802.
    * Do the test given in Para. 3.
       2 If there is continuity:
     (c) If the fault continues:
   (2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
     (a) If there is a fault when you release and/or push the ANTI ICE/GEN2 pushbutton switch:
  • Remove EIU2 AMM 73-25-34-000-802.
  • Do a continuity check of the wiring ASM 302102 between:
    . Pin A/B2 of the ANTI ICE/ENG 2 pushbutton switch (2DN2) and pin AA/5C of EIU2
    . Pin A/B1 of the ANTI ICE/ENG 2 pushbutton switch (2DN2) and pin AA/4A of EIU1.
       1 If there is no continuity:
       2 If there is continuity:
  • Replace the P/BSW-ANTI ICE/ENG 2 [2DN2] ESPM 204511.
  • Do the test given in Para. 3.
         a If the fault continues:
     (b) If there is no fault when you release and/or push the ANTI ICE/GEN2 pushbutton switch:
  • Remove EIU2 AMM 73-25-34-000-802.
  • Use PLIERS - JAWED, SOFT to disconnect electrical connector P1 of the EEC and do a continuity check of the wiring AWM 732526 and AWM 715135 between:
    . Pin AA/11K of EIU2 and pin P1/c of the EEC
    . Pin AA/12K of EIU2 and pin P1/B of the EEC.
       1 If there is no continuity:
  • Do a continuity check of the wiring AWM 732526 between:
    . Pin AA/11K of EIU2 and pin 36 of 402VC2
    . Pin AA/12K of EIU2 and pin 18 of 402VC2.
         a If there is no continuity:
  • Repair the wiring.
  • Do the test given in Para. 3.
         b If there is continuity:
     (c) If the fault continues:
5. Close-up
Subtask 30-21-00-942-074-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.
[Rev.8 from Aug 2018] 2026.04.04 04:29:33 UTC
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