2004 Toyota PriusFACTORY OEM SERVICE PROCEDURE

SFI System (1NZ-FXE): Inspection

  1. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY 
    1. Inspect the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

      Standard: 

      TESTER CONNECTION'S SPECIFIED CONDITION

      Tester Connection Specified Condition
      1 (+) - 2 (-) 6.9 to 7.9 Ω at 20°C (68°F)

      If the resistance is not as specified, replace the camshaft timing oil control valve.

      Fig 1: Measuring Resistance Between Camshaft Timing Oil Control Valve Connector Terminals
      G02920005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the operation.
      1. Apply battery voltage across the terminals, then check that the spool valve operates.
    NOTE: Check that the spool valve is not stuck.

    HINT:

    The spool valve may not return if foreign objects are caught in the spool valve. It may cause subtle pressure leaks to the advance side, and the DTC may be set.

    Fig 2: Applying Battery Voltage Across Terminals Then Checking That Spool Valve Operates
    G02920006Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT MASS AIR FLOW METER 
    1. Check the operation.
      1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
      2. Using an ohmmeter, connect the positive (+) tester probe to terminal 3 (VG) and the negative (-) tester probe to terminal 2 (E2G).
      3. Blow air into the mass air flow meter, then check that the voltage fluctuates.

      If the voltage does not fluctuate, replace the mass air flow meter.

      Fig 3: Blowing Air Into Mass Air Flow Meter, Then Checking Voltage Fluctuates
      G02920007Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Inspect the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

      Standard: 

      TESTER CONNECTION'S SPECIFIED CONDITION

      Tester Connection Specified Condition
      4 (THA) - 5 (E2) 13.6 to 18.4 kΩ at -20°C (-4°F)
      4 (THA) - 5 (E2) 2.21 to 2.69 kΩ at 20°C (68°F)
      4 (THA) - 5 (E2) 0.493 to 0.667 kΩ at 60°C (140°F)

    If the resistance is not as specified, replace the mass air flow meter.

    Fig 4: Measuring Resistance Between Mass Air Flow Meter Connector Terminals
    G02920008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    1. Inspect the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

      Standard: 

      TESTER'S CONNECTION'S SPECIFIED CONDITION

      Tester Connection Specified Condition
      1 (E2) - 2 (THW) 2.32 to 2.59 kΩ at 20°C (68°F)
      1 (E2) - 2 (THW) 0.310 to 0.326 kΩ at 80°C (176°F)
    NOTE: If checking the engine coolant temperature sensor in water, be careful not to allow water to intrude into the terminals. After checking, wipe out water on the engine coolant temperature sensor.

    If the resistance is not as specified, replace the engine coolant temperature sensor.

    Fig 5: Measuring Resistance Between Engine Coolant Temperature Sensor Connector Terminals
    G02920009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT THROTTLE W/MOTOR BODY ASSY 
    1. Check the appearance.
      1. Check that the throttle valve shaft does not rattle.
      2. Check that each port is not clogged.
      3. Check that the throttle valve opens and closes smoothly.
      4. Check that there is no clearance between the throttle stop screw and lever when the throttle valve is fully closed.
      NOTE: Do not adjust the throttle stop screw.
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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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