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 COMPONENTS SERVICE SPECIFICATION
| Fuel pump | Resistance: at 20°C (68°F) | 0.2 - 3.0 ohm |
| Fuel pressure regulator | Fuel pressure | 304 - 343 kPa (3.1 - 3.5 kgf/cm2 , 44 - 50 psi) |
| Injector | Resistance: at 20°C (68°F) Injection volume Difference between each cylinder Fuel leakage |
13.4 - 14.2 ohm 60 - 73 cm3 (3.7 - 4.5 cu in.) per 15 sec. 13 cm3 (0.8 cu in.) or less 1 drop or less per 12 min. |
| MAF meter | Resistance (THA - E2): at -20°C (-4°F) at 20°C (68°F) at 60°C (140°F) |
13.6 - 18.4kohm 2.21 - 2.69 kohm 0.493 - 0.667 kohm |
| Throttle body | Throttle body fully closed angle | 3.5° |
| Throttle control motor | Motor (M+ - M-): at 20°C (68°F) Clutch (CL+ - CL-): at 20°C (68°F) |
0.3 - 100 ohm 4.2 - 5.2 ohm |
| Throttle position sensor | Resistance (VC - E2): at 20°C (68°F) Throttle valve opening percentage: STD |
1.2 - 3.2 kohm 14.8 +/- 0.8% |
| Accelerator pedal position sensor | Resistance (VC - E2): at 20°C (68 °F) Accelerator pedal position voltage: STD |
1.2 - 3.2 kohm 0.3 - 0.9 V |
| Camshaft timing oil control valve | Resistance: at 20°C (68°F) | 5.5 - 12 ohm |
| Fuel pump resister | Resistance: at 20°C (68°F) | 0.30 - 0.35 ohm |
| VSV for EVAP | Resistance: at 20°C (68°F) | 27 - 33 ohm |
| VSV for ACIS | Resistance: at 20°C (68°F) | 38.5 - 44.5 ohm |
| VSV for CCV | Resistance: at 20°C (68°F) | 24 - 30 ohm |
| VSV for pressure switching valve | Resistance: at 20°C (68°F) at 120°C (248°F) |
37 - 44 ohm 51 - 62 ohm |
| ECT sensor | Resistance: at -20°C (-4°F) 0°C (32°F) 20°C (68°F) 40°C (104°F) 60°C (140°F) 80°C (176°F) |
10 - 20 kohm 4 - 7 kohm 2 - 3 kohm 0.9 - 1.3 kohm 0.4 - 0.7 kohm 0.2 - 0.4 kohm |
| Vapor pressure sensor | Power source voltage | 4.5 - 5.5 V |
| Heated oxygen sensor | Heater coil resistance: at 20°C (68°F) at 800°C (1,472°F) |
11 - 16ohm 23 - 32 ohm |
| Fuel cut rpm | Fuel return rpm | 1,000 rpm |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.