- replace the CONT-ZONE TEMPERATURE (8HK) (Ref. AMM TASK 21-63-34-000-001) and (Ref. AMM TASK 21-63-34-400-001).
 (4) If the fault continues:
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 B. Do the test given in Para. 3.A.
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 TASK 73-25-00-810-939
 Loss of Data on the ARINC Bus from the EIU to the FADEC on Engine 2
 1. Possible Causes
_______________
 - EIU-2 (1KS2)

 - harness J3 between the EIU-2 (1KS2) and the ECU (4000KS)

 - CONT-ZONE TEMPERATURE (8HK)

 - ECU (4000KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION

 -------------------------------------------------------------------------------
AMM 21-63-34-000-001 Removal of the Zone Controller (8HK)
 AMM 21-63-34-400-001 Installation of the Zone Controller (8HK)
 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 73-25-34-000-040 Removal of the Engine Interface Unit (EIU) (1KS1,1KS2) AMM 73-25-34-400-040 Installation of the Engine Interface Unit (EIU) (1KS1,1KS2) AMM 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring) ASM 73-25/06
 3. Fault Confirmation
__________________
 A. Do the operational test of the FADEC 2B on the ground (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message FCU, EIU (034), J3:
 - do a check for open or short to ground of the harness J3 between the EIU-2 (1KS2) and the ECU (4000KS) pins AB/5A, 5C to pins J3/22, 23 (Ref. ASM 73-25/06).
 (1) If the wiring is not correct:

 - repair the above wiring.

 (2) If the wiring is correct:

 - replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
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 - replace the CONT-ZONE TEMPERATURE (8HK) (Ref. AMM TASK 21-63-34-000-001) and (Ref. AMM TASK 21-63-34-400-001).
 (4) If the fault continues:
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 B. Do the test given in Para. 3.A.
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 TASK 73-25-00-810-940
 Loss of Data on the ARINC Bus from the EIU to the Fadec on Engine 1
 1. Possible Causes
_______________
 - EIU-1 (1KS1)

 - harness J3 between the EIU-1 (1KS1) and the ECU (4000KS)

 - CONT-ZONE TEMPERATURE (8HK)

 - ECU (4000KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION

 -------------------------------------------------------------------------------
AMM 21-63-34-000-001 Removal of the Zone Controller (8HK)
 AMM 21-63-34-400-001 Installation of the Zone Controller (8HK)
 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 73-25-34-000-040 Removal of the Engine Interface Unit (EIU) (1KS1,1KS2) AMM 73-25-34-400-040 Installation of the Engine Interface Unit (EIU) (1KS1,1KS2) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with Engine non Motoring) ASM 73-25/06
 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
　
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