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.
2004 Toyota PriusFACTORY OEM SERVICE PROCEDURE
Service Data
Engine Control System Service Data
| Camshaft timing oil control valve assy | ||
| Resistance | 1 (+) - 2 (-) | 6.9 to 7.9Ω at 20°C (68°F) |
| Mass airflow meter | ||
| Resistance | 4 (THA) - 5 (E2) | 13.6 to 18.4kΩ at-20°C (-4°F) |
| 2.21 to 2.68 kΩ at 20°C (68°F) | ||
| 0.493 to 0.667 kΩ at 60°C (140°F) | ||
| Engine coolant temperature sensor | ||
| Resistance | 1 (E2) - 2 (THW) | 2.32 to 2.59 kΩ at 20°C (68°F) |
| 0.310 to 0.326 kΩ at 80°C (176°F) | ||
| Throttle w/ motor body assy | ||
| Throttle valve opening percentage | 60 % or more | |
| Idle speed | 950 to 1,050 rpm | |
| Resistance (Throttle control motor) | 1 (M+) - 2 (M+) | 0.3 to 100Ω at 20°C (68°F) |
| Resistance (Throttle position sensor) | 1 (VC) - 4 (E2) | 1.25 to 2.35Ω at 20°C (68°F) |
| Knock sensor | ||
| Resistance | 1 (Ground) - 2 (Output) | 120 to 280kΩ at 20°C (68°F) |
| EFI Relay | ||
| Resistance | B5 - B8 | 10 kΩ or higher |
| Below 1 Ω (Apply battery voltage to terminal B6 and B7) | ||
| Circuit opening relay | ||
| Resistance | B5 - B8 | 10 kΩ or higher |
| Below 1 Ω (Apply battery voltage to terminal B6 and B7) |
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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