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ELECTRICAL COMPONENTS – SUBARU EX40
ENGINE CONTROL UNIT (ECU)
CAUTION
• The Engine Control Unit (ECU) and Throttle Body are to be purchased as one unit. They are matched
pairs with matching serial numbers. Do not mix an ECU with another Throttle Body of a different serial
number. Doing so violates emissions standards and warranty.
The ECU is located in the engine compartment.
TESTING THE ENGINE CONTROL UNIT
See Test Procedure 4 – EFI System (ECU and Sensors) on page 18-23.
ENGINE CONTROL UNIT REMOVAL
1.
Disconnect battery. See Disconnecting the Battery- Gasoline Vehicles on page 1-3.
2.
Remove ECU mounting plate bolts.
3.
Disconnect gray and black wire connectors.
ENGINE CONTROL UNIT INSTALLATION
WARNING
• To prevent damage to the ECU, never mix the black and gray connectors that attach to it. The black
connector is tethered to the ECU mounting plate to help prevent accidentally installing it in the gray
port.
1.
Mount ECU to plate with bolts and tighten to 60 lb·in (6.8 N·m).
2.
Install gray connector to the gray port on the ECU. See preceding WARNING.
3.
Install black connector to the black port on the ECU.
4.
Connect the battery.
2018 Onward Maintenance and Service Manual
Engine Control Unit (ECU)
Page 19-17
19
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Troubleshooting
