Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2018 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Engine Control Module (ECM): Removal
- Disconnect the ground terminal from battery sensor. Ref. to NOTE>BATTERY .
- Remove the clip (A) and clip (B) which secure the engine wiring harness and bulkhead harness from the bracket, and remove the bolt which secures the ECM to the bracket.
- Pull out the ECM from the bracket.NOTE: When performing the pulling out operation, pay attention not to apply excessive load to the breather filter portion (a) in order to avoid the damage.
- While pressing the part (A) shown in the figure, move the lock lever (B) in the direction of the arrow to disconnect the connectors from the ECM in numerical order as shown in the figure.
- Remove the bracket from ECM.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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