SFI System (2UZ-FE): Inspection

INSPECT MASS AIR FLOW METER
1. Output voltage inspection.
  1. Apply battery voltage across terminals 3 (+B) and 4 (E2G).
  2. Connect the positive (+) tester prove to terminal 5 (VG), and negative (-) tester prove to terminal 4 (E2G).
  3. Blow air into the MAF meter, and check if the voltage fluctuates.
2. Resistance inspection.
  1. Using an ohmmeter, measure resistance between the terminals 2 (THA) and 1 (E2).
  Resistance:
  1. 12.5-16.9 kΩ at -20°C (-4°F)
  2. 2.19-2.67 kΩ at 20°C (68°F)
  3. 0.50-0.68 kΩ at 60°C (140°F)
  Fig 1: Identifying MAF Sensor Terminals & Resistance Values
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT THROTTLE W/MOTOR BODY ASSY
1. Disconnect the throttle control motor connector.
2. Using an ohmmeter, measure the motor resistance between terminal M+ and M-.
  1. Motor resistance: 0.3-100 Ω at 20 °C (68 °F)
  Fig 2: Measuring Motor Resistance Between Throttle Control Motor Terminals M+ & M-
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT KNOCK SENSOR
1. Continuity inspection.
  1. Using an ohmmeter, check that these is no continuity between the terminal and body.
  1. Specified condition: No continuity
  Fig 3: Checking Knock Sensor Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT ENGINE COOLANT TEMPERATURE SENSOR
1. Resistance inspection.
  1. Using an ohmmeter, measure the resistance between terminals.
  Resistance:
  1. 2.32 - 2.59 kΩ at 20 °C (68 °F)
  2. 0.310 - 0.326 kΩ at 80 °C (176 °F)
  NOTE: When inspecting the water temperature sensor in water, prevent water flow into the terminals. After inspection, wipe the water off from the sensor.
  
  Fig 4: Measuring Resistance Between Water Temperature Sensor Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT CIRCUIT OPENING RELAY
1. Continuity inspection.
  1. Using an ohmmeter, check for continuity between each terminal.
    
    Fig 5: Identifying Opening Relay Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 6: Checking Opening Relay Continuity
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Using an ohmmeter, check for continuity between terminals 3 and 5 when the battery voltage is applied across terminals 1 and 2.
  1. Specified condition: Continuity
INSPECT EFI RELAY
1. Continuity inspection.
  1. Using an ohmmeter, check for continuity between each terminal.
    
    Fig 7: Identifying EFI Relay Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 8: Checking EFI Relay Continuity
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Using an ohmmeter, check for continuity between terminals 3 and 5 when the battery voltage is applied across terminals 1 and 2.
  1. Specified condition: Continuity