2004 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

SFI System: Inspection

  1. INSPECT MASS AIR FLOW METER 
    1. Check the output voltage.
      1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
      2. Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
      3. Blow air in to the MAF meter, and check that the voltage fluctuates.
    2. Measure the resistance between terminals 4 (THA) and 5 (E2).

    Standard: 

    Fig 1: Terminals 4 (THA) And 5 (E2) Resistance Chart
    G01049374Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the result is not as specified, replace the MAF meter.

    Fig 2: Inspecting Mass Air Flow Meter
    G01049375Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY 
    1. Using an ohmmeter, measure the resistance between the terminals.

      Standard: 6.9 to 7.9 Ω at 20°C (68°F) 

    2. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 2. Check the movement of the valve.
      Fig 3: Valve Movement Chart
      G01049376Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If operation is not as specified, replace the valve.

      Fig 4: Inspecting Camshaft Timing Oil Control Valve Assy
      G01049377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT ACCELERATOR PEDAL ROD ASSY 
    1. Measure the resistance between the terminals.

    Standard: 

    Fig 5: Terminals Resistance Chart
    G01049378Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the result is not as specified, replace the pedal assy.

    Fig 6: Identifying Accelerator Pedal Rod Assy Connector Terminals
    G01049379Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT THROTTLE BODY ASSY 
    1. Measure the resistance between the terminals.

    Standard: 

    Fig 7: Terminals Resistance Chart
    G01049380Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the result is not as specified, replace the throttle body assy.

    Fig 8: Identifying Throttle Body Assy Connector Terminals
    G01049381Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    1. Measure the resistance between terminals 1 and 2.

    Standard: 

    Fig 9: Coolant Temperature Sensor Terminals 1 And 2 Resistance Chart
    G01049382Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the result is not as specified, replace the sensor.

    NOTE: If checking the ECT sensor in the water, keep the terminals dry. After the check, wipe the sensor dry.
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.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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 Quote

No obligation. See pricing before you book.