(2) If no IDG failure warning or messages are present:

 - check the PFR and look for failure messages including the following R words: FLSCU; fuel level sensing; FRV, J7 and/or FRV, J8; EIU; EIU R (031) for possible causes of forced closure of the fuel return R valve.
 (a) If messages are present, do the related trouble shooting procedure.

 (b) If no failure messages are present:

 - get a sample of oil from the engine oil tank.
 1 If you can smell fuel presence in the engine oil:
_

 - replace the IDG oil/fuel heat exchanger (Ref. AMM TASK 79-21-20-000-002) and (Ref. AMM TASK 79-21-20-400-002),

 - do a check of the lubrication unit magnetic plugs and screens (Ref. AMM TASK 79-21-10-210-002).

 2 If nothing is found:
_

 - do a functional check of the fuel return valve to make sure that it operates correctly (Ref. AMM TASK 73-11-50-210-002)
 a If the valve does not operate correctly:
_

 - replace the valve (Ref. AMM TASK 73-11-50-000-002) and (Ref. AMM TASK 73-11-50-400-002).
 b If the valve operates correctly:
_

 - replace the FADEC oil temperature sensor (not 4004EN) (Ref. AMM TASK 79-31-40-000-002) and (Ref. AMM TASK 79-31-40-400-002).
 3 If the fault continues:
_

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 4 If the fault continues:
_

 - replace the pressure-holding valve (124QM) (Ref. AMM TASK 28-16-41-000-001) and (Ref. AMM TASK 28-16-41-400-001).
 5 If the fault continues:
_

 - replace the fuel recirculation check-valve (Ref. AMM TASK 28-16-42-000-001) and (Ref. AMM TASK 28-16-42-400-001).
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 B. Test

 (1) Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006).

 (2) Repeat the fault isolation procedure if the fault continues.

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 TASK 79-40-00-810-802

R  Engine 2 oil temperature read by the Fadec sensor is higher than 135 deg.C (275 deg.F)
 1. Possible Causes
_______________

 - IDG

 - EIU

 - fuel return valve

 - IDG oil/fuel heat exchanger

 - FADEC oil temperature sensor (not 4004EN)

 - ECU (4000KS)

 - pressure-holding valve (125QM)

 - fuel recirculation check-valve

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
AMM  28-16-41-000-001 
AMM  28-16-41-400-001 
AMM  28-16-42-000-001 
AMM  28-16-42-400-001 
AMM  71-00-00-710-006 
AMM  73-11-50-000-002 
AMM  73-11-50-210-002 
AMM  73-11-50-400-002 
AMM  73-21-60-000-001 
AMM  73-21-60-400-001 
AMM  79-21-10-210-002 
AMM  79-21-20-000-002 
AMM  79-21-20-400-002 
AMM  79-31-40-000-002 
AMM  79-31-40-400-002 

3. Fault Confirmation
__________________
 A. Test

 (1) Not applicable.
 F EEFF : ALL E E ECES Removal of the Pressure-Holding Valve 124QM (125QM)Installation of the Pressure-Holding Valve 124QM (125QM)Removal of the Fuel Recirculation Check-valveInstallation of the Fuel Recirculation Check-valveMinimum Idle CheckRemoval of the Fuel Return Valve (FRV)Inspection/Check of the Fuel Return ValveInstallation of the Fuel Return ValveRemoval of the Electronic Control Unit (ECU)Installation of the Electronic Control Unit (ECU)Check of the Lubrication Unit Magnetic Plugs and ScreensRemoval of the Main Oil/Fuel Heat ExchangerInstallation of the Main Oil/Fuel Heat ExchangerRemoval of the Oil Temperature Sensor (IDG Cooling System Control Sensor)Installation of the Oil Temperature Sensor (IDG Cooling System Control Sensor)
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