F EEFF : ALL E E ECES Wet Motoring CheckRemoval of the Hydromechanical Unit (HMU)Installation of the Hydromechanical Unit (HMU)Removal of the HJ7 HarnessRemoval of the HJ8 Harness Visual Inspection of the Wiring HarnessesInstallation of the HJ7 HarnessInstallation of the HJ8 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)Operational Test of the FADEC on the Ground (with Engine non Motoring)
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REFERENCE DESIGNATION
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ASM 73-25/18
 3. Fault Confirmation
__________________
 A. Test

 (1) Do the Wet Motoring Check (Ref. AMM TASK 71-00-00-710-002).

 (2) 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 J7/J8, HMU (SOV SW) or J7/J8, HMU (SOV SW)*:
 - do a check for open or short to ground of the harnesses J7 and J8 between the ECU (4000KS) and the HMU pins J7 and J8/9, 22 to pins J7 and J8/9, 22 (Ref. ASM 73-25/18).
 (1) If one of these wirings is not correct:
 - repair the defective above wiring.
 (2) If these wirings are correct: R - disconnect the cables J7 and J8 from the HMU. R - install a jumper wire between the pins 9 and 22 on the cables J7 R and J8. R - disconnect the cables J7 and J8 from the ECU (4000KS). R - do a visual inspection of the harness connector and receptacle. R Look for contamination or oxidation or pins that have damage. R - if you find damage, repair or replace as required. R - clean the connector and receptacle with a bristle brush and R stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-R 002). R - do a resistance check of the cable J7 then J8 at the ECU connectors R between: R
 . pins 9 and 22 (< 5 ohms)
 . pins 8 and 9 (> 10 megohms)
 . pins 9 and the ground (> 10 megohms).

 (a) If the resistance values are in the specified limits:
 - replace the hydromechanical unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
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 (b) If the resistance values are out of the specified limits: R - replace the defective harness J7 (Ref. AMM TASK 73-21-50-000-R 040) and (Ref. AMM TASK 73-21-50-400-040) or replace the R defective harness J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref.
 AMM TASK 73-21-50-400-041).
 (3) 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).
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 TASK 73-20-00-810-932

 Failure of the High Pressure Shut Off Valve Switch of the HMU on Engine 2
 1. Possible Causes
_______________

 - hydromechanical unit (HMU)

 - harness J7

 - harness J8

 - ECU (4000KS)

 2. Job Set-up Information
______________________
R A. Fixtures, Tools, Test and Support Equipment

R -------------------------------------------------------------------------------R REFERENCE QTY DESIGNATION
R -------------------------------------------------------------------------------
R No specific bristle brush

R B. Consumable Materials

R -------------------------------------------------------------------------------R REFERENCE DESIGNATION
R -------------------------------------------------------------------------------
R Material No. CP2011 *
R stoddard solvent (Ref. 70-30-00)

R C. Referenced Information

 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
R  AMM AMM AMM AMM AMM AMM AMM AMM AMM AMM  71-00-00-710-002 73-21-10-000-002 73-21-10-400-002 73-21-50-000-040 73-21-50-000-041 73-21-50-210-002 73-21-50-400-040 73-21-50-400-041 73-21-60-000-001 73-21-60-400-001 
　
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