- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 (4) If the fault continues:
 - do a check and repair the aircraft wiring between the ADIRU1 (1FP1) and the connector 402VC1 on the pylon junction box, pins AA/12B, 12D to pins 402VC1/14, 28 (Ref. AWM 73-25-25) and (Ref. ASM 73-25/10).
 B. Do the test given in Para. 3.
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 TASK 71-50-00-810-829
 Loss of the ADIRU1 Signal to the ECU on Engine 2
 1. Possible Causes
_______________
 - harness J3

 - ADIRU-1 (1FP1)

 - ECU (4000KS)

 - aircraft wiring between the ADIRU1 (1FP1) and the connector 402VC2 on the pylon junction box

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 34-12-34-000-001 Removal of the ADIRU (1FP1, 1FP2, 1FP3) AMM 34-12-34-400-001 Installation of the ADIRU (1FP1, 1FP2, 1FP3) R 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 R (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
 Engine non Motoring)
 ASM 73-25/10
 AWM 71-51-04
 AWM 73-25-25

 3. Fault Confirmation
__________________
 A. Test
 (1) 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 J3, ADC1 or J3, ADC1*:
 - do a check for open or short to ground of the harness J3 between the ECU (4000KS) and the connector 402VC2 on the pylon junction box, pins J3/9, 2 to pins 402VC2/28, 14 (Ref. AWM 71-51-04).
 (1) If the fault continues:

 - replace the harness J3.

 (2) If the fault continues:

 - replace the ADIRU-1 (1FP1) (Ref. AMM TASK 34-12-34-000-001) and (Ref. AMM TASK 34-12-34-400-001).
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 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 (4) If the fault continues:
 - do a check and repair the aircraft wiring between the ADIRU1 (1FP1) and the connector 402VC2 on the pylon junction box: pins AA/14B, 14D to pins 402VC2/14, 28 (Ref. AWM 73-25-25) and (Ref. ASM 73-25/10).
 B. Do the test given in Para. 3.
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 TASK 71-50-00-810-830
 Loss of the ADIRU2 Signal to the ECU on Engine 1
 1. Possible Causes
_______________
 - harness J4

 - ADIRU-2 (1FP2)

 - ECU (4000KS)

 - aircraft wiring between the ADIRU2 (1FP2) and the connector 403VC1 on the pylon junction box

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 34-12-34-000-001 Removal of the ADIRU (1FP1, 1FP2, 1FP3) AMM 34-12-34-400-001 Installation of the ADIRU (1FP1, 1FP2, 1FP3) R 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 R (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
 Engine non Motoring)
 ASM 73-25/10
 AWM 71-51-04
 AWM 73-25-33

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the FADEC 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
　
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