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.
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HOMESERVICE MANUALSTOYOTA2012PRIUS THREEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM (EXCEPT PLUG-IN) (DIAGNOSTIC CODES (P0441-U0293) & CIRCUIT TESTS)SFI SYSTEMDTC P050B: COLD START IGNITION TIMING PERFORMANCEINSPECTION PROCEDURE
2012 Toyota Prius Three
Inspection Procedure
2012 Toyota Prius ThreeSECTION Inspection Procedure
NOTE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
- DTC P050B may be set when the engine shows the symptom as listed below. If necessary, check the trouble area as listed below.
Symptom Factor Trouble Area Low idle speed at engine cold.
(immediately after engine start)Excessive engine friction Engine oil deterioration Rough idle at engine cold.
(immediately after engine start)Abnormal combustion Fuel quality - Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
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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.