LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2004 >> Prius >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> SFI System (1NZ-FXE) >> Inspection
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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.
      Fig 6: Checking Each Port Is Not Clogged And There Is No Clearance Between Throttle Stop Screw & Lever
      G02920010Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 7: Measuring Resistance Between Throttle Control Motor Connector Terminals
      G02920011Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Inspect the resistance of the throttle control motor.
      1. Using an ohmmeter, measure the resistance between the terminals.

      Standard: 

      TESTER CONNECTION'S SPECIFIED CONDITION

      Tester Connection Specified Condition
      1 (M-) - 2 (M+) 0.3 to 100 Ω at 20°C (68°F)

      If the resistance is not as specified, replace the throttle with motor body.

      Fig 8: Measuring Resistance Between Throttle Position Sensor Connector Terminals
      G02920012Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Inspect the resistance of the throttle position sensor.
      1. Using an ohmmeter, measure the resistance between the terminals.

      Standard: 

      TESTER CONNECTION'S SPECIFIED CONDITION

      Tester Connection Specified Condition
      1 (VC) - 4 (E2) 1.25 to 2.35 kΩ at 20°C (68°F)

      If the resistance is not as specified, replace the throttle with motor body.

  5. INSPECT KNOCK SENSOR 
    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 (Ground) - 2 (Output) 120 to 280 kΩ at 20°C (68°F)

    If the resistance is not as specified, replace the knock sensor.

    Fig 9: Measuring Resistance Between Knock Sensor Connector Terminals
    G02920013Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSPECT EFI RELAY 
    1. Inspect the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

      Standard: 

      TESTER CONNECTION'S SPECIFIED CONDITION

      Tester Connection Specified Condition
      B5 - B8 10 kΩ or higher
      B5 - B8 Below 1 Ω (Apply battery voltage to terminal B6 and B7)

    If the result is not as specified, replace the EFI relay.

    Fig 10: Measuring Resistance Between EFI Relay Connector Terminals
    G02920014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. INSPECT CIRCUIT OPENING RELAY 
    1. Inspect the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

      Standard: 

      TESTER CONNECTION'S SPECIFIED CONDITION

      Tester Connection Specified Condition
      B5 - B8 10 kΩ or higher
      B5 - B8 Below 1 Ω (Apply battery voltage to terminal B6 and B7)

    If the result is not as specified, replace the circuit opening relay.

    Fig 11: Measuring Resistance Between Circuit Opening Relay Connector Terminals
    G02920015Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals