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 4. Fault Isolation
_______________
 A. If the test gives the maintenance message ECU (ARINC OUT):
 - do a check for a short to ground at the wiring and connectors between the ECU (4000KS) and the test receptacle of the aircraft computers: . EIU1 (1KS1) - DMC1 (1WT1) . DMC2 (1WT2) - DMC3 (1WT3) . FMGC1 (1CA1) - FWC1 (1WW1) . FWC2 (1WW2) - DMU (1TV) (Ref. ASM 73-25/10).
 (1) If there is a short to ground:

 - repair the defective wiring.

 (2) If there is no short to ground:

 - 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 73-20-81-810-875

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 Internal Failure of the ECU on Engine 2
 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) ASM 73-25/10
 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 (ARINC OUT):
 - do a check for a short to ground at the wiring and connectors between the ECU (4000KS) and the test receptacle of the aircraft computers: . EIU2 (1KS2) - DMC1 (1WT1) . DMC2 (1WT2) - DMC3 (1WT3) . FMGC1 (1CA1) - FWC1 (1WW1) . FWC2 (1WW2) - DMU (1TV) (Ref. ASM 73-25/10).
 (1) If there is a short to ground:

 - repair the defective wiring.

 (2) If there is no short to ground:

 - 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 73-20-81-810-876 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 (TECU SENSOR):
 - 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 73-20-81-810-877 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)
　
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