- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (2) If there is no 115VAC:

 - do a check for 115VAC at the EIU-2 (1KS2) pin AC/1.
 (a) If there is 115VAC:
 - replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
 1 If the fault continues:
_
 - replace the J2 harness between the EIU-2 (1KS2) and the ECU (4000KS).
 (b) If there is no 115VAC:
 - do a check of the wiring between the EIU-2 (1KS2) pin AC/1 and the circuit breaker (3JH2).
 1 If there is no continuity:
_ - repair the above wiring.
 2 If there is continuity:
_
 - replace the C/B-ENGINE/ING/ENG2/SYS B (3JH2).
 (3) If the fault continues:
 - make sure that there is no ground signal at the EIU-2 (1KS2) pin AA/5B.
 B. If the circuit breaker (3JH2) is open:
 - close it.
 (1) If the circuit breaker trips:
 - remove the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and

 - remove the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040).

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 - do a check and repair the wiring for short to ground between the EIU-2 (1KS2) pin AC/1 and the circuit breaker (3JH2).
 (a) If the fault continues:
 - replace the C/B-ENGINE/ING/ENG2/SYS B (3JH2).
 (3) If the circuit breaker stays closed:
 - install the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-400-040).
 (a) If the circuit breaker trips:

 - replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).

 (b) If the circuit breaker stays closed:

 - install the ECU (4000KS) (Ref. AMM TASK 73-21-60-400-001).
 1 If the circuit breaker trips:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 2 If the circuit breaker trips again:
_
 - do a check and repair the wiring between the ECU (4000KS) pins J2/7, 8 and the EIU-2 (1KS2) pin AC/4.
 (4) If the fault continues:
 - make sure that there is no ground signal at the EIU-2 (1KS2) pin AA/5B.
 C. Do the test given in Para. 3.
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 TASK 71-50-00-810-828
 Loss of the ADIRU1 Signal to the ECU on Engine 1
 1. Possible Causes
_______________
 - harness J3

 - ADIRU-1 (1FP1)

 - ECU (4000KS)

 - aircraft wiring between the ADIRU1 (1FP1) and the connector 402VC1 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 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 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 402VC1 on the pylon junction box, pins J3/9, 2 to pins 402VC1/28, 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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