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 Lexus RX 300 FWDFACTORY OEM SERVICE PROCEDURE
Service Data
SFI SERVICE SPECIFICATIONS
| Fuel pressure regulator | Fuel pressure | at no vacuum | 301 - 347 kPa (3.1 - 3.5 kgf/cm2 , 44 - 50 psi) |
| Fuel pump | Resistance | at 20°C (68°F) | 0.2-3.0 Ω |
| Injector | Resistance | 13.4 - 14.2 Ω | |
| Injection volume | 60 - 73 cm3 (3.7 - 4.5 cu | ||
| Difference between each | in.) per 15 sec. | ||
| cylinder | 13 cm3 (0.8 cu in.) or less | ||
| Fuel leakage | 1 drop or less per minute | ||
| MAF meter | Resistance (THA - E2) | at -20°C (-4°F) | 14.6 - 17.8 kΩ |
| at 20°C (68°F) | 2.21 - 2.69 kΩ | ||
| at 60°C (140°F) | 0.29 - 0.35 kΩ | ||
| Throttle body | Throttle opener setting speed | 900 - 1,950 rpm | |
| Throttle position sensor | Resistance | VTA-E2 | 0.2 - 6.3 kΩ |
| Throttle valve fully closed | VTA-E2 | 2.0 - 10.2 kΩ | |
| Throttle valve fully open | VC-E2 | 2.5 - 5.9 kΩ | |
| - | |||
| IAC valve | Resistance (+B - RSO or RSC) | at cold at hot |
17.0 - 24.5 Ω 21.5- 28.5 Ω |
| Camshaft timing oil control valve | Resistance | at 20°C (68°F) | 6.9 - 7.9 Ω |
| VSV for EVAP | Resistance | at 20°C (68°F) | 27 - 33 Ω |
| VSV for ACIS N0.1, N0.2 | Resistance | at 20°C (68°F) | 33 - 39 Ω |
| VSV for Vapor Pressure Sensor | Resistance | at 20°C (68°F) | 33 - 39 Ω |
| Vapor Pressure Sensor | Power source voltage | 4.5 - 5.5 V | |
| ECT sensor | Resistance | at -20°C (-4°F) | 10 - 20kΩ |
| at 0°C (32°F) | 4 - 7 kΩ | ||
| at 20°C (68°F) | 2 - 3kΩ | ||
| at 40°C (104°F) | 0.9 - 1.3 kΩ | ||
| at 60°C (140°F) | 0.4 - 0.7 kΩ | ||
| at 80°C (176°F) | 0.2 - 0.4 kΩ | ||
| Air fuel ratio (A/F) sensor | Heater coil resistance | at 20°C (68°F) | 11 - 16Ω |
| Heated oxygen sensor | Heater coil resistance | at 20°C (68°F) | 11 - 16Ω |
| Fuel cut rpm | Fuel return rpm | 1,200 rpm | |
Factory Service Tools
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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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