Removal of the Fuel Return Valve (FRV)Installation of the Fuel Return ValveRemoval of the HJ7 HarnessRemoval of the HJ8 HarnessInstallation 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)
R A. Do the operational test of the FADEC 1A on the ground (with engine non R motoring) (Ref. AMM TASK 73-29-00-710-040).
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.
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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
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
R (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). R
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:
. pins 3 and 4 (< 5 ohms) . pin 3 and the ground (> 10 megohms).
1 If the resistance values are out of the specified limits:
_
- replace the fuel return valve (Ref. AMM TASK 73-11-50-000-002) and (Ref. AMM TASK 73-11-50-400-002).
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 B. Do the test given in Para. 3.A. R
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TASK 73-10-00-810-822
Failure of the Feedback of the Fuel Return Valve on Engine 2
1. Possible Causes
_______________
- ECU (4000KS)
- fuel return valve R
- harness J7 R - harness J8
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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