B. Check the Electrical Master Chip Detector visual indication after the next flight.
 (1) No additional maintenance action is required if the fault is not confirmed .

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

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 The oil temperature of engine 1 and engine 2 are significantly different
 1. Possible Causes
_______________
 - IDG

 - fuel return valve
 - oil/fuel heat exchanger

 - low fuel level

 - fuel in surge tank

 - boost pumps off
 - oil temperature sensor (4004EN)

 - EIU

 - engine oil temperature sensor

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  71-00-00-710-006 
AMM  71-51-43-000-001 
AMM  71-51-43-400-001 
AMM  73-11-50-000-002 
AMM  73-11-50-400-002 
AMM  73-11-50-720-001 
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 
AMM  79-32-15-000-041 
AMM  79-32-15-400-041 
ASM  79-36/01

 3. Fault Confirmation
__________________
 A. Test
 (1) Not applicable.
 F EEFF : ALL E
R E ECES Minimum Idle CheckRemoval of the Left Side Harness (4216KS)Installation of the Left Side Harness (4216KS)Removal of the Fuel Return Valve (FRV)Installation of the Fuel Return ValveFunctional Test 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)Removal of the Oil Temperature Sensor (Engine Condition Monitoring Sensor)Installation of the Oil Temperature Sensor (Engine Condition Monitoring Sensor)
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 4. Fault Isolation
_______________
 A. A too high oil temperature can be due to one of the following failures:
 - too high IDG oil temperature,

 - fuel return valve failure (closed),
 - oil/fuel heat exchanger failure,

 - engine oil temperature sensor failure (input parameter for fuel return valve control),

 - aircraft oil temperature sensor failure (cockpit indication),

 - forced fuel return valve closure in case of too high fuel temperature in the tank (above 55 deg. C or 131 deg. F), too low fuel level in the tank(s), presence of fuel in surge tank or boost pumps off.

 NOTE : Do the following trouble shooting on the engine exhibiting the
____ highest oil temperature unless the oil temperature on one engine is significantly lower compared to previous flights trend indications.
 NOTE : In case the idle speed on one engine is higher than other engine
____ (engine running in modulated engine mode), do the following trouble shooting on the engine running with the highest idle.
 (1) Read the post flight report (PFR) and check for failure messages including the following words: FRV, IDG, EOT SNSR, SENSOR OIL TEMP, FLSCU, FUEL LEVEL SENSING. Do the trouble shooting related to the failure message(s) if present.

 (2) If the engine oil temperature is higher than the IDG oil outlet temperature (on ECAM ELEC page):

 - replace the oil temperature sensor (4004EN) (Ref. AMM TASK 79-32-15-000-041) and (Ref. AMM TASK 79-32-15-400-041).
 (a) If the fault continues:
 - check the electrical wiring between the oil temperature sensor 4004EN and the EIU for abnormal resistance (too high, more than 2 ohms). Pay particular attention to electrical connector at engine to pylon interface and to ground wire connections 9951DC, 9956DC, and 9957DC on Engine Fan Case (Ref. AMM TASK 71-51-43-000-001) and (Ref. AMM TASK 71-51-43-400-001) for looseness or contamination (Ref. ASM 79-36/01).
　
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