R AMM 73-21-50-000-040 Removal of the HJ7 Harness AMM 73-21-50-000-041 Removal of the HJ8 Harness
R AMM 73-21-50-400-040 Installation of the HJ7 Harness AMM 73-21-50-400-041 Installation of the HJ8 Harness 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) R AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with R Engine non Motoring) R ASM 73-25/18
 3. Fault Confirmation
__________________
R A. Do the operational test of the FADEC 2A on the ground (with engine non R motoring) (Ref. AMM TASK 73-29-00-710-040).
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 4. Fault Isolation
_______________
R A. The fault is generated when the ECU detects a disagreement in the
R indication of the fuel return valve position given by the switch of
R channel A compared with the switch of channel B.

R (1) If the test does not give the maintenance message FRV (SW), J7/J8,
R ECU but the fault is repetitive:

R (a) Inspect the J7 and J8 harnesses and associated connectors to the
R fuel return valve and ECU for sign of looseness, damage or
R contamination (Ref. ASM 73-25/18).
R - Re-tighten, clean or replace harness as required.
R If no defect is found either or on the harness or the connector
R no further action is due.

R (b) If the fault continues or is repetitive:
R - Replace the fuel return (Ref. AMM TASK 73-11-50-000-002) and
R (Ref. AMM TASK 73-11-50-400-002).

R (c) If the Fault continues:
R - Replace the harness J7 (Ref. AMM TASK 73-21-50-000-040) and
R (Ref. AMM TASK 73-21-50-400-040).

R (d) If the fault continues:
R - Replace the harness J8 (Ref. AMM TASK 73-21-50-000-041) and
R (Ref. AMM TASK 73-21-50-400-041).

R (e) If the fault continues: R - Replace the ECU (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001);
R (2) If the test gives the maintenance message FRV (SW), J7/J8, ECU:
R - Disconnect the harnesses J7 and J8 from the ECU and do a resistance
R check on the J7 and J8 harness between:

R . pins 31 and 14 (< 5 ohms)

R . pins 31 and 33 (> 10 megohms).

R . pin 31 and the ground (> 10 megohms).

R (a) If the resistance values are in the specified limits:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and
R (Ref. AMM TASK 73-21-60-400-001).

R (b) If the resistance values are out of the specified limits:
R - Disconnect the harness J7 and J8 from the fuel return valve and
R do a check of the resistance on the valve switch connectors on
R each channel between:

R . pins 3 and 4 (< 5 ohms)

R . pin 3 and the ground (> 10 megohms).

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R  1_  If the resistance values are out of the specified limits:
R  - replace the fuel return valve (Ref. AMM TASK 73-11-50-000-
R  002) and (Ref. AMM TASK 73-11-50-400-002). 
R  2_  If the resistance values are in the specified limits:
R  - replace the harness J7 (Ref. AMM TASK 73-21-50-000-040) and 
R  (Ref. AMM TASK 73-21-50-400-040) and/or the harness J8 (Ref. 
R  AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-
041). 
R 
R  B. Do the test given in Para. 3.A. 
R

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 TASK 73-10-00-810-831
 Feedback Disagree between the Signals of the Two Channels of the BSV on Engine
 1. Possible Causes
_______________
 - burner staging valve (BSV)

 - harness J11

 - harness J12

 - harness CJ11L

 - harness CJ12L

 - ECU (4000KS)

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