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.
2003 Toyota PriusFACTORY OEM SERVICE PROCEDURE
Engine Control System: Precaution
CAUTION:
A repair operation incorrectly performed on the hybrid vehicle (HV) could cause an electrical shock, leakage or explosion. Be sure to perform repair operations correctly.
- REMOVE KEY FROM IGNITION SWITCH
- ENSURE THAT CHARGE CONNECTOR IS DISCONNECTED
- WEAR INSULATING GLOVES ALWAYS
- DISCONNECT NEGATIVE (-) TERMINAL CABLE FROM AUXILIARY BATTERY
- REMOVE SERVICE PLUG AND DO NOT START ANY REPAIR OPERATION BEFORE 5 MINUTES HAVE PASSED CAUTION:
- Due to the discharge resistance, it takes at least 5 minutes before the 273.6 V electricity is sufficiently discharged from the condenser in the inverter circuit.
- Even after the 5 minutes have passed, the following precaution should be observed. Before touching a 273.6 V cable or any other cable which you cannot identify, use the tester to confirm that the voltage through the cable is 12 V or less.
- After removing the service plug, cover the plug connector using rubber or vinyl tape.
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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