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.
2021 Toyota Prius XLE AWD-eFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnostics - Introduction (1 Of 4)
- SFI System
- Precaution [11/2015 - 12/2018]
- Precaution [12/2018 - 07/2020]
- Precaution [07/2020 - ]
- Definition Of Terms [11/2015 - ]
- Parts Location [11/2015 - 12/2018]
- Parts Location [12/2018 - ]
- System Diagram [11/2015 - 08/2019]
- System Diagram [08/2019 - ]
- How To Proceed With Troubleshooting [11/2015 - ]
- Check For Intermittent Problems [11/2015 - ]
- Basic Inspection [11/2015 - ]
- Registration [11/2015 - ]
- Initialization [11/2015 - ]
- Checking Monitor Status [11/2015 - ]
- Readiness Monitor Drive Pattern [11/2015 - 12/2018]
- Readiness Monitor Drive Pattern [12/2018 - ]
- Problem Symptoms Table [11/2015 - ]
- Terminals Of ECM [11/2015 - 08/2019]
- Terminals Of ECM [08/2019 - 07/2020]
- Terminals Of ECM [07/2020 - ]
- Diagnosis System [11/2015 - 07/2020]
- Diagnosis System [07/2020 - ]
- DTC Check / Clear [11/2015 - 07/2020]
- DTC Check / Clear [07/2020 - ]
- Freeze Frame Data [11/2015 - 11/2017]
- Freeze Frame Data [11/2017 - 12/2018]
- Freeze Frame Data [12/2018 - ]
- Check Mode Procedure [11/2015 - ]
- Fail-Safe Chart [11/2015 - 12/2018]
- Fail-Safe Chart [12/2018 - ]
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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