R C. Referenced Information

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REFERENCE DESIGNATION
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R  AMM AMM AMM AMM AMM AMM AMM  73-11-50-000-002 73-11-50-400-002 73-21-50-000-041 73-21-50-210-002 73-21-50-400-041 73-21-60-000-001 73-21-60-400-001 
AMM  73-29-00-710-040 
ASM  78-25/18

 F
R EEFF : ALL E E ECES Removal of the Fuel Return Valve (FRV)Installation of the Fuel Return ValveRemoval of the HJ8 Harness Visual Inspection of the Wiring HarnessesInstallation 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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 3. Fault Confirmation
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 A. Test
 (1) 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
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 A. The fault is generated when the ECU detects an open circuit or a short to ground on the fuel return valve solenoid for second level cooling or on associated electrical harness.
 (1) If the test does not give the maintenance message J8, FRV(SOL 2), ECU or if the fault is repetitive:
 - Inspect the harness J8 and associated connectors to the fuel return valve and ECU for sign of looseness, damage or contamination (Ref. ASM 78-25/18). Pay particular attention on pins 32 and 15 at the connector to the ECU and at pins 5 and 6 at the connector to the fuel return valve.

 - 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 J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).

 (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 J8, FRV(SOL 2), ECU: R - disconnect the harness J8 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 J8 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 J8 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 J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
 B. Do the test given in Para. 3.A.
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