- repair the above defective wiring.

 (2) If the wiring is correct:

 - disconnect the cable J8 from the ECU (4000KS) and do a check of the ECU cable resistance between: . pins 27 and 28 (17 to 23 Ohms).
 (a) If the resistance values are in the specified limits:
 - 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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 (b) If the resistance values are out of the specified limits:
 - disconnect the cable J8 from the HMU and do a resistance check of the HMU between: . pins 27 and 28 (17 to 23 Ohms).
 1 If the resistance values are in the specified limits:
_
 - replace the defective harness J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
 2 If the resistance values are out of the specified limits:
_
 - replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
 B. Do the test given in Para. 3.A. R
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R TASK 73-10-00-810-845
R Failure of the BSV Open on Engine 1
R 1. Possible Causes_______________
R - J14 Identification Connector R - BSV R - harness HJ7 R - harness HJ8 R - HMU R - ECU (4000KS)
R 2. Job Set-up Information______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R  AMM  72-41-00-290-001 
R 
R 
R 
R  AMM  72-51-00-290-004 
R 
R  AMM  73-11-70-000-001 
R  AMM  73-11-70-400-001 
R  AMM  73-21-10-000-001 
R  AMM  73-21-10-400-001 
R  AMM  73-21-50-000-040 
R  AMM  73-21-50-000-041 
R  AMM  73-21-50-400-040 
R  AMM  73-21-50-400-041 
R  AMM  73-21-60-000-001 
R  AMM  73-21-60-400-001 
R 
R  AMM  73-21-90-000-002 
R  AMM  73-21-90-400-002 
R  AMM  73-21-90-860-001 
R 
R  AMM  73-29-00-710-040 
R 
R  3. Fault Confirmation__________________ 
R  A. Test 

Borescope Inspection of the Combustion Chamber Liners, Dome Areas,High Pressure Turbine Nozzle Vanes and Shrouds (as far as visible through two opposite ports) Borescope Inspection of High-Pressure Turbine Nozzle Assembly Removal of the Burner Staging Valve (BSV) Installation of the Burner Staging Valve (BSV) Removal of the Hydromechanical Unit (HMU) Installation of the Hydromechanical Unit (HMU) Removal of the HJ7 Harness Removal of the HJ8 Harness Installation of the HJ7 Harness Installation of the HJ8 Harness Removal of the Electronic Control Unit (ECU)(4000KS) Installation of the Electronic Control Unit (ECU)(4000KS) Removal of the Engine Identification Connector Installation of the Engine Identification Connector Programming of the Identification Connector (Push-Pull Design) Operational Test of the FADEC on the Ground (with Engine Motoring)
R (1) Do the operational test of the FADEC on the ground (with engine R motoring) (Ref. AMM TASK 73-29-00-710-040).
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R 4. Fault Isolation
_______________

R A. If the test gives the maintenance message BSV(OP), J14(WRONG):
R - Verify the nameplate of the engine:

R (1) If the nameplate is for a SAC engine:
R - verify that a SAC ID plug is installed

R NOTE : The ID plug can be checked on the MCDU screen. Access

____ R reporting functions, then select the LRU Idenfication screen.
R Line 4 of the LRU Identification screen will display: R - "EGT MON" or "SAC CONFIG" for a SAC ID plug R - "DAC CONFIG" for a DAC ID plug
　
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