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.
2012 Toyota Yaris Base, Automatic TransFACTORY OEM SERVICE PROCEDURE
Engine Control System (Service Information)
- CAMSHAFT OIL CONTROL VALVE (for Sedan)
- CAMSHAFT OIL CONTROL VALVE (for Hatchback)
- THROTTLE BODY (for Sedan)
- THROTTLE BODY (for Hatchback)
- ECM (for Sedan)
- ECM (for Hatchback)
- ACCELERATOR PEDAL (for Sedan)
- ACCELERATOR PEDAL (for Hatchback)
- MASS AIR FLOW METER (for Sedan)
- MASS AIR FLOW METER (for Hatchback)
- CAMSHAFT POSITION SENSOR (for Sedan)
- CAMSHAFT POSITION SENSOR (for Hatchback)
- CRANKSHAFT POSITION SENSOR (for Sedan)
- CRANKSHAFT POSITION SENSOR (for Hatchback)
- IGNITION COIL AND SPARK PLUG (for Sedan)
- IGNITION COIL AND SPARK PLUG (for Hatchback)
- ENGINE COOLANT TEMPERATURE SENSOR (for Sedan)
- ENGINE COOLANT TEMPERATURE SENSOR (for Hatchback)
- KNOCK SENSOR (for Sedan)
- KNOCK SENSOR (for Hatchback)
- AIR FUEL RATIO SENSOR (for Sedan)
- AIR FUEL RATIO SENSOR (for Hatchback)
- HEATED OXYGEN SENSOR (for Sedan)
- HEATED OXYGEN SENSOR (for Hatchback)
- INTEGRATION RELAY (for Sedan)
- INTEGRATION RELAY (for Hatchback)
Factory Service Tools
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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