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.
On-Vehicle Inspection
- Perform the MAF meter inspection according to the procedures below.
- Only replace the MAF meter when both the LONG FT#1 value and MAF value in the DATA LIST (with the engine stopped) are not within the normal operating range.
- CHECK MASS AIR FLOW METER
- Read value using Techstream (MAF).NOTE:
- Turn off the engine.
- Perform the inspection with the vehicle indoors and on a level surface.
- Perform the inspection of the MAF meter while it is installed to the air cleaner case (installed to the vehicle).
- During the test, do not use the exhaust air duct to perform suction on the exhaust pipe.
- Turn the power switch on (ACC).
- Turn the power switch on (do not start the engine).
- Turn the Techstream ON.
- Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.
- Wait 30 seconds, and read the values on the Techstream.
Standard condition:
Less than 0.07 g/sec.
- If the result is not as specified, replace the MAF meter.
- If the result is within the specified range, inspect the cause of the extremely rich or lean air fuel ratio (see DTC P0171 SYSTEM TOO LEAN (FUEL TRIM); DTC P0172 SYSTEM TOO RICH (BANK 1) ).
- Read value using Techstream (MAF).
Use the Manual With the Right Hardware
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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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