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Engine Control System (SFI) (1MZ-FE/3MZ-FE): 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 into the MAF meter, and check that the voltage fluctuates.
    2. Measure the resistance between terminals 4 (THA) and 5 (E2).

      Standard: 

      MASS AIR FLOW METER SPECIFIED CONDITION

      Condition Specified Condition
      -20 °C (-4°F) 13.6 to 18.4 kΩ
      20°C (68°F) 2.21 to 2.69 kΩ
      60°C (140°F) 0.493 to 0.667 kΩ

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

      Fig 1: Mass Air Flow Meter Resistance And Temperature Graph
      G02892161Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY 
    1. Measure the resistance between the terminals.

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

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

    2. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 2, and check the movement of the valve.
      NOTE: Confirm that the valve moves freely and does not become stuck in any position.

      If necessary, replace the OCV assy.

      HINT:

      If the valve cannot return properly because of foreign matter, a small pressure leak in the advanced direction may occur and a DTC will be output.

      Fig 2: Applying Battery Power & Checking Movement Of Valve
      G02892162Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT ACCELERATOR PEDAL ASSY 
    1. Measure the resistance between the terminals.

      Standard: 

      ACCELERATOR PEDAL ASSY SPECIFIED CONDITION

      Tester Connection Specified Condition
      2 (VPA2) - 3 (EP1) 5.0 kΩ or less
      5 (VPA1) - 1 (EP2) 5.0 kΩ or less
      6 (VCP1) - 3 (EP1) 2.25 to 4.75 kΩ
      4 (VCP2) - 1 (EP2) 2.25 to 4.75 kΩ

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

      Fig 3: Identifying Accelerator Pedal Assembly Connector Terminals
      G02892163Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT THROTTLE BODY ASSY 
    1. Measure the resistance between the terminals.

      Standard: 

      THROTTLE BODY ASSY SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      2 (M+) - 1 (M-) 20°C (68°F) 0.3 to 100Ω
      5 (VC) - 3 (E2) 20°C (68°F) 2.0 to 4.0 kΩ

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

      Fig 4: Identifying Throttle Body Assembly Connector Terminals
      G02892164Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    1. Measure the resistance between each terminal.

      Standard: 

      ENGINE COOLANT TEMPERATURE SENSOR SPECIFIED CONDITION

      Condition Specified Condition
      Approx. 20°C (68°F) 2.32 to 2.59 kΩ
      Approx. 80°C (176°F) 0.310 to 0.326 kΩ

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

      NOTE: If checking the engine coolant temperature sensor in the water, keep the terminals dry. After the check, wipe the sensor dry.
      Fig 5: Inspecting Engine Coolant Temperature Sensor
      G02892165Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSPECT KNOCK SENSOR (1MZ-FE ENGINE TYPE) 
    1. Using an ohmmeter, measure the resistance between the terminal and body.

      Standard: 10 kΩ or higher 

      HINT:

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

      Fig 6: Measuring Resistance Between Terminal And Sensor Body Using Ohmmeter (1MZ-FE Engine Type)
      G02892166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. INSPECT KNOCK SENSOR (3MZ-FE ENGINE TYPE) 
    1. Using an ohmmeter, measure the resistance between the terminals.

      Standard: 120 to 280 kΩ at 20°C (68°F) 

      HINT:

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

      Fig 7: Measuring Resistance Between Terminal And Sensor Body Using Ohmmeter (3MZ-FE Engine Type)
      G02892167Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSPECT RELAY (Marking: EFI, C/OPN) 
    1. Using an ohmmeter, measure the resistance of the relay.

      Standard: 

      EFI, C/OPN RELAY SPECIFIED CONDITION

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1Ω (when battery voltage is applied to terminals 1 and 2)

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

      Fig 8: Identifying EFI, C/OPN Relay Terminals
      G02892168Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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