2004 Scion xA AutomaticFACTORY OEM SERVICE PROCEDURE

SFI System: Inspection

  1. INSPECT MASS AIR FLOW METER 
    1. Output voltage inspection.
      1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
      2. Connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
      3. Blow air into the MAF meter, and check that the voltage output fluctuates.
    2. Resistance inspection.
      1. Using an ohmmeter, measure the resistance between terminals 4 (THA) and 5 (E2).

    Resistance: 

    Fig 1: Terminals (THA & E2) Resistance Reference Chart
    G00754719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY 
    1. Resistance inspection.
      1. Using an ohmmeter, measure the resistance between the terminals.

      Resistance: 6.9 to 7.9 ohm at 20°C (68°F) 

      Fig 2: Temperature And Resistance Relating Graph For Mass Air Flow
      G00754720Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Movement inspection.
      1. Connect the battery positive (+) lead to terminal 1 and negative (-) lead to terminal 2, and check the movement of the valve.
    NOTE: Confirm the valve moves freely and does not stick in any position.

    HINT: 

    Foreign objects in the oil can cause subtle pressure leaks in the valve. The pressure leak will cause the cam to advance. This condition will usually set a DTC.

    Fig 3: Inspecting Camshaft Timing Oil Control Valve Movement
    G00754721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT THROTTLE BODY ASSY 
    1. Check the throttle body.
      1. Check that the throttle valve shaft is not rickety.
      2. Check that all ports are not stopped up.
      3. Check that the throttle valve opens and closes smoothly.
      4. Check that there is no clearance between the throttle stop screw and throttle lever at the throttle valve closed position.
    NOTE: Do not touch the throttle stop screw.
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.