2003 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

Service Data

ENGINE CONTROL SYSTEM SERVICE DATA

Throttle body
Standard throttle valve opening percentage 60% or more
Accelerator pedal position sensor
Voltage (ACCEL POS)
Accelerator pedal released 0.5-1.1V
Accelerator pedal depress 2.6-4.5V
Voltage (ACCEL POS#2)
Accelerator pedal released 1.2-2.0 V
Accelerator pedal depress 3.4-5.3 V
Mass air flow meter
Resistance
at-20°C(-4°F) 12.5-16.9 kΩ
at 20°C(68°F) 2.19-2.67 kΩ
at 60°C(140°F) 0.50-0.68 kΩ
Throttle W/Motor body
Resistance
at 20 °C (68°F) 0.3-100 Ω
Knock control sensor
Specified condition No continuity
Engine coolant temperature sensor
Resistance
Approx. 20°C (68°F) 2.32-2.59 kΩ
Approx. 80°C (176°F) 0.310-0.326 kΩ
E.F.I. Circuit opening relay assy
Specified condition
1-2 Continuity
3-5 No continuity
Main relay
Specified condition
1-2 Continuity
3-5 No continuity
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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