Wet Motoring CheckRemoval of the Fuel Return Valve (FRV)Installation of the Fuel Return ValveRemoval of the HJ8 HarnessInstallation of the HJ8 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)
R A. The fault is generated when the fuel return valve fails to reach the
R closed position when commanded by the ECU.

R (1) Inspect the harness J8 and associated connector for sign of damage or
R contamination (Ref. ASM 73-25/18).
R Pay particular attention to pins 14 and 31 on the harness connector
R to the ECU and to pins 3 and 4 on the harness connector to the fuel
R return valve. Defective contacts on those connectors may give an
R erroneous indication of the fuel return valve position switches.

R (2) If damage is found:
R - replace the harness J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref.
R AMM TASK 73-21-50-400-041).

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R  (3) If nothing is found: 
R  - replace the fuel return valve (Ref. AMM TASK 73-11-50-000-002) and 
R  (Ref. AMM TASK 73-11-50-400-002). 
R  (4) If the fault continues: 
R  - replace the harness J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. 
R  AMM TASK 73-21-50-400-041). 
R  (5) If the fault continues: 
R  - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. 
R  AMM TASK 73-21-60-400-001). 
R 
R  B. Do a wet motoring test of the engine (Ref. AMM TASK 71-00-00-710-002) and 
R  check that the fault does not duplicate. 
R

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 TASK 73-10-00-810-816
 Failure of the FRV of the Engine 2 in the Open Position, on Channel B
 1. Possible Causes
_______________
R
 - harness J8 R - fuel return valve R - ECU (4000KS)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
R R R R R  AMM AMM AMM AMM AMM AMM AMM  71-00-00-710-002 73-11-50-000-002 73-11-50-400-002 73-21-50-000-041 73-21-50-400-041 73-21-60-000-001 73-21-60-400-001 
R  ASM  73-25/18
 3. Fault Confirmation__________________ 
R R A. Not applicable. 
4. Fault Isolation_______________ 

Wet Motoring Check Removal of the Fuel Return Valve (FRV) Installation of the Fuel Return Valve Removal of the HJ8 Harness Installation of the HJ8 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)
R A. The fault is generated when the fuel return valve fails to reach the
R closed position when commanded by the ECU.

R (1) Inspect the harness J8 and associated connector for sign of damage or
R contamination (Ref. ASM 73-25/18).
R Pay particular attention to pins 14 and 31 on the harness connector
R to the ECU and to pins 3 and 4 on the harness connector to the fuel
R return valve. Defective contacts on those connectors may give an
R erroneous indication of the fuel return valve position switches.

R (2) If damage is found:
R - replace the harness J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref.
R AMM TASK 73-21-50-400-041).

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R  (3) If nothing is found: 
R  - replace the fuel return valve (Ref. AMM TASK 73-11-50-000-002) and 
R  (Ref. AMM TASK 73-11-50-400-002). 
　
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