- Re-tighten, clean or replace harness as required.
(a) If no defect is found either or on the harness or the connector no further action is due.
(b) If the fault continues or is repetitive:
- Replace the fuel return valve (Ref. AMM TASK 73-11-50-000-002) and (Ref. AMM TASK 73-11-50-400-002).
(c) If the fault continues:
- Replace the harness J7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(d) If the fault continues:
- Replace the ECU (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(2) If the test gives the maintenance message J7, FRV(SOL 2), ECU: R - disconnect the harness J7 from the ECU. 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 on the harness J7 between: R
. pins 32 and 15 (18 to 38 ohms) . pins 32 and 33 (> 10 megohms) . pin 32 and the ground (> 10 megohms).
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(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).
(b) If the resistance values are out of the specified limits: R - disconnect the harness J7 from the fuel return valve. 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-R 210-002). R - do a resistance check between: R
. pins 5 and 6 (18 to 38 ohms) . pin 5 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:
_
- replace the harness J7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
B. Do the test given in Para. 3.A.
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TASK 73-20-00-810-910
Failure of the Control of the Solenoid 2 of the Fuel Return Valve on Channel A, Engine 2
1. Possible Causes
_______________
- ECU (4000KS)
- fuel return valve
- harness J7
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
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R AMM AMM AMM AMM AMM AMM AMM 73-11-50-000-002 73-11-50-400-002 73-21-50-000-040 73-21-50-210-002 73-21-50-400-040 73-21-60-000-001 73-21-60-400-001
AMM 73-29-00-710-040
ASM 78-25/18
F EEFF : ALL E E ECES Removal of the Fuel Return Valve (FRV)Installation of the Fuel Return ValveRemoval of the HJ7 Harness Visual Inspection of the Wiring HarnessesInstallation of the HJ7 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) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 发动机燃油和控制 1(111)
