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 3. Fault Confirmation
__________________
 A. Do the operational test of the FADEC 2A 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 (PRESS SYS B):
 - 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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 Internal Failure of the ECU - CPU FAULT - Engine 1 - Channel A
 1. Possible Causes
_______________
 - ECU (4000KS)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)
R AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)
R AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
R Engine Non motoring)

 3. Fault Confirmation
__________________
R A. Do the operational test of the FADEC 1A on the ground (with engine non R motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
R A. This failure message is generated when there is an internal ECU
R processing fault.

R (1) If the failure message ECU (CPU FAULT) is not confirmed:
R - no maintenance action is required.

R (2) If the failure message ECU (CPU FAULT) is not confirmed, but is
R repetitive:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref.
R AMM TASK 73-21-60-400-001).

R (3) If the failure message ECU (CPU FAULT) is confirmed:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref.
R 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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 Internal Failure of the ECU - CPU FAULT - Engine 2 - Channel A
 1. Possible Causes
_______________
 - ECU (4000KS)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)
R AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)
R AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
R Engine Non motoring)

 3. Fault Confirmation
__________________
R A. Do the operational test of the FADEC 2A on the ground (with engine non R motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
R A. This failure message is generated when there is an internal ECU
R processing fault.

R (1) If the failure message ECU (CPU FAULT) is not confirmed:
R - no maintenance action is required.

R (2) If the failure message ECU (CPU FAULT) is not confirmed, but is
R repetitive:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref.
R AMM TASK 73-21-60-400-001).

R (3) If the failure message ECU (CPU FAULT) is confirmed:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref.
R 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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