ELECTRICALCOMPONENTS–SUBARUEX40EngineControlUnit(ECU)
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ENGINECONTROLUNIT(ECU)
CAUTION
•TheEngineControlUnit(ECU)andThrottleBodyaretobepurchasedasoneunit.Theyarematched
pairswithmatchingserialnumbers.DonotmixanECUwithanotherThrottleBodyofadifferentserial
number.Doingsoviolatesemissionsstandardsandwarranty.
TheECUislocatedintheenginecompartment.
TESTINGTHEENGINECONTROLUNIT
SeeTestProcedure4–EFISystem(ECUandSensors)onpage18-23.
ENGINECONTROLUNITREMOVAL
1.Disconnectbattery.SeeDisconnectingtheBattery-GasolineVehiclesonpage1-3.
2.RemoveECUmountingplatebolts.
3.Disconnectgrayandblackwireconnectors.
ENGINECONTROLUNITINSTALLATION
WARNING
•TopreventdamagetotheECU,nevermixtheblackandgrayconnectorsthatattachtoit.Theblack
connectoristetheredtotheECUmountingplatetohelppreventaccidentallyinstallingitinthegray
port.
1.MountECUtoplatewithboltsandtightento60lb·in(6.8N·m).
2.InstallgrayconnectortothegrayportontheECU.SeeprecedingWARNING.
3.InstallblackconnectortotheblackportontheECU.
4.Connectthebattery.
2018OnwardMaintenanceandServiceManualPage19-17