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 Lexus IS 300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Service Data
SFI Service Data
| Fuel pump | Resistance at | 20°C (68°F) | 0.2 - 3.0 Ω |
| Fuel pressure regulator | Fuel pressure | 304 - 343 kPa (3.1 - 3.5 kgf/cm2 , 44 - 50 psi) | |
| Injector | Resistance | at 20°C (68°F) | 13.4 - 14.2 Ω |
| Injection volume | 60 - 73 cm3 (3.7 - 4.5 cu in.) per 15 sec. | ||
| Difference between each cylinder | 13 cm3 (0.8 cu in.) or less | ||
| Fuel leakage | 1 drop or less per 12 min. | ||
| MAF meter | Resistance (THA - E2) | at-20°C (-4°F) | 13.6 - 18.4kΩ |
| at 20°C(68°F) | 2.21 - 2.69 kΩ | ||
| at 60°C(140°F) | 0.493 - 0.667 kΩ | ||
| Throttle body | Throttle body fully closed angle | 3.5° | |
| Throttle control motor | Motor (M+ - M-) | at 20°C (68°F) | 0.3 - 100 Ω |
| Clutch (CL +- CL-) | at 20°C(68°F) | 4.2 - 5.2 Ω | |
| Throttle position sensor | Resistance (VC - E2) | at 20°C(68°F) | 1.2 - 3.2 kΩ |
| Throttle valve opening percentage | STD | 14.8 ± 0.8% | |
| Accelerator pedal position sensor | Resistance (VC - E2) | at 20°C(68°F) | 1.2 - 3.2 kΩ |
| Accelerator pedal position voltage | STD | 0.3 - 0.9 V | |
| Camshaft timing oil control valve | Resistance | at 20°C (68°F) | 5.5 - 12 Ω |
| Fuel pump resister | Resistance | at 20°C (68°F) | 0.30 - 0.35 Ω |
| VSV for EVAP | Resistance | at 20°C(68°F) | 27 - 33 Ω |
| VSV for ACIS | Resistance | at 20°C (68°F) | 38.5 - 44.5 Ω |
| VSV for CCV | Resistance | at 20°C (68°F) | 24 - 30 Ω |
| VSV for pressure switching valve | Resistance | at 20°C (68°F) | 37 - 44 Ω |
| at 120°C(248°F) | 51 - 62Ω | ||
| ECT sensor | Resistance | at -20°C (-4°F) | 10 - 20kΩ |
| 0°C (32°F) | 4 - 7kΩ | ||
| 20°C (68°F) | 2 - 3kΩ | ||
| 40°C (104°F) | 0.9 - 1.3kΩ | ||
| 60°C(140°F) | 0.4 - 0.7 kΩ | ||
| 80°C (176°F) | 0.2 - 0.4 kΩ | ||
| Vapor pressure sensor | Power sorce voltage | 4.5 - 5.5 V | |
| Heated oxygen sensor | Heater coil resistance | at 20°C (68°F) | 11 - 16Ω |
| at 800°C (1,472°F) | 23 - 32Ω | ||
| Fuel cut rpm | Fuel return rpm | 1,000 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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