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 BRZ Limited, Automatic TransFACTORY OEM SERVICE PROCEDURE
On-Vehicle Inspection
- Function inspection of intake air flow meter SUB-ASSY
- Inspection of intake air amount
CAUTION:
- Perform inspection with the vehicle on a level surface and engine stopped.
- Perform the inspection with the air cleaner ASSY installed.
- Do not suction the exhaust emission from the exhaust tail pipe with the exhaust duct.
- Connect the SSM4 to the DLC.
- Turn the ignition switch to ON, and then wait for 30 seconds.
- According to the display on the SSM4, select [Data monitor] →[Mass Air Flow], and read the intake air amount.
STANDARD VALUE SPECIFICATION
| Item name | Inspection conditions | Standard value |
|---|---|---|
| Mass air flow | Engine stops 30 seconds after IG ON | Less than 0.85 g/s |
CAUTION:
- If it is out of standard value, replace the intake air flow meter SUB-ASSY.
- If it is within standard value, check the intake air flow meter SUB-ASSY. (Refer to ON-VEHICLE INSPECTION )
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.