- On the left or right MCDU, get access to the ENGINE MAIN MENU screen.

 - On the MCDU, push the line key (4R) adjacent to the applicable Specific tests indication.

 - push the line key (5L) adjacent to the SEC RELAY STATUS:

 (1) If MCDU screen indicates SEC RELAY OPEN, the failure is not confirmed.

 - No further action is required

 (2) If MCDU screen indicates SEC RELAY CLOSED, the failure is confirmed.

 - Do the step 4. Fault Isolation
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 4. Fault Isolation
_______________
 A. If MCDU screen indicates SEC RELAY CLOSED:
 - Pull C/B 24KS2

 - Push the line key (6L) adjacent to "RETURN" and re-select the SEC RELAY STATUS page:

 (1) If MCDU screen indicates SEC RELAY CLOSED:
 - Replace the Relay (28KS2).
 (a) If the fault continues:
 - Remove the EIU

 - Do a check for a ground signal at pin E2 of the EIU rack-connector AA:

 1 If there is no ground signal:
_

 - replace the EIU (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
 2 If there is a ground signal:
_

 - Repair the wiring between EIU connector AA and 28KS2 (Ref. ASM 73-25/08).
 (2) If MCDU screen indicates SEC RELAY OPEN:
 - Replace the Relay (27KS2).
 (a) If the fault continues:
 - Pull C/B 21CE1 and 21CE2.

 - Push the line key (6L) adjacent to "RETURN" and re-select the SEC RELAY STATUS page:

 1 If SEC RELAY CLOSED is displayed:
_

 - Repair the wiring between SEC1/2 and 27KS2 (Ref. ASM 73-25/23).
 2 If SEC RELAY OPEN is displayed:
_

 - push back C/B 21CE1 and Re-select MCDU SEC RELAY STATUS page:
 a If SEC RELAY CLOSED is displayed:
_

 - replace the SEC1 (Ref. AMM TASK 27-94-34-000-001) and (Ref. AMM TASK 27-94-34-400-001).
 b If SEC RELAY OPEN is displayed:
_

 - replace the SEC2 (Ref. AMM TASK 27-94-34-000-001) and (Ref. AMM TASK 27-94-34-400-001).
 B. Do the test given in Para. 3.A.
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 TASK 73-20-00-810-984
 Loss of TCM information between EIU and ECU
 1. Possible Causes
_______________
 - EIU (1KS1)

 - 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)
 AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)
 AMM 73-25-34-000-040 Removal of the Engine Interface Unit (EIU)
 AMM 73-25-34-400-040 Installation of the Engine Interface Unit (EIU)
 AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with

 Engine Motoring)
 ASM 73-25/08

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the FADEC on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message EIU(150), J3:
 - Remove EIU

 - Disconnect J3 harness from ECU

 - Do a continuity check between: . pins 5C from EIU receptacle connector AB and 22 from J3 harness . pins 5A from EIU receptacle connector AB and 23 from J3 harness

 (1) If there is continuity:

 - Replace EIU (1KS1) (Ref. AMM TASK 73-25-34-000-040) (Ref. AMM TASK 73-25-34-400-040).
 (a) If the fault continues:
 - Replace ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) (Ref. AMM TASK 73-21-60-400-001).

 (2) If there is no continuity:

 - repair or replace the wiring as required (Ref. ASM 73-25/08).
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