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TASK 73-20-81-810-835
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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TASK 73-20-81-810-836
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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