(3) If the failure message ECU (NVM FAULT) is confirmed:

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 B. Do the test given in Para. 3.A.
 (1) No additional maintenance action is required if the fault is not confirmed.

 (2) Repeat the fault isolation procedure if the fault continues.

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ECES  TASK 73-20-81-810-904 Internal Failure of the ECU on Engine 1

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 1. Possible Causes
_______________
 - ECU (4000KS)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with Engine non Motoring)
 3. Fault Confirmation
__________________
 A. Do the operational test of the FADEC 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message ECU (SPEED CONV):
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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ECES  TASK 73-20-81-810-905 Internal Failure of the ECU on Engine 2

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 1. Possible Causes
_______________
 - ECU (4000KS)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with Engine non Motoring)
 3. Fault Confirmation
__________________
 A. Do the operational test of the FADEC 2B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message ECU (SPEED CONV):
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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ECES  TASK 73-20-81-810-906 Internal Failure of the ECU on Engine 1

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 1. Possible Causes
_______________
 - ECU (4000KS)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with Engine non Motoring)
 3. Fault Confirmation
__________________
 A. Do the operational test of the FADEC 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message ECU (EIU INTFC):
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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 E E Aug 01/01 E E ECES
E TASK 73-20-81-810-907 Internal Failure of the ECU on Engine 2

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