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On-Vehicle Inspection

  1. INSPECT AIR-FUEL RATIO COMPENSATION SYSTEM 
    1. Measure the voltage between the terminals of the ECM connectors.

      Standard voltage 

      AIR-FUEL RATIO COMPENSATION SYSTEM

      Tester Connection Condition Specified Condition
      B2-22 (A1A-) - B3-1 (E1) Ignition switch ON 3.3 V
      B2-23 (A2A+) - B3-1 (E1) Ignition switch ON 3.3 V
      B2-30 (A1A+) - B3-1 (E21) ignition switch ON 2.9 V
      B2-31 (A2A-) - B3-1 (E1) Ignition switch ON 2.9 V
      NOTE: Connect test leads from the back side of the connector. Do not disconnect the connectors from the ECM.

      HINT:

      Voltage between the terminals of the ECM is kept constant regardless of the voltage of the A/F sensor.

      Fig 1: Measuring Voltage Between Terminals Of ECM Connectors
      G05109732Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the intelligent tester to the DLC3.
      Fig 2: Connecting Intelligent Tester To DLC3
      G05108946Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Turn the ignition switch ON.
    4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / AFS B1 S1 and O2S B1 S2.
    5. Warm up the A/F sensor with the engine speed at 2,500 rpm for approximately 2 minutes.
    6. Maintain the engine speed at 2,500 rpm and confirm that the display on the intelligent tester, when AFS B1 S1 is selected.

      HINT:

      • The display on the intelligent tester may slightly differ from the illustration.
      • Only the intelligent tester displayed the waveform of the A/F sensor.
      Fig 3: Identifying Engine Speed Output Voltage Graph
      G05109734Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Confirm that the waveform displays on the intelligent tester, when O2S B1 S2 is selected, changes between 0 V and 1 V with the engine speed at 2,500 rpm.

      OK: 

      The voltage output oscillates more than 8 times in 10 seconds. 

      CAUTION:
      • Perform the check immediately after warming up the engine.
      • If the voltage variation could not be verified, warm up the heated oxygen sensor again. If it could not be verified even after warming up the sensor again, check the DTC No. (See DIAGNOSTIC TROUBLE CODE TABLE )
  2. INSPECT FUEL CUT-OFF RPM 
    1. Increase the engine speed to at least 3,500 rpm.
    2. Use a sound scope to check for injector operating sounds.
    3. Check that the injector operating sounds stop momentarily and then resume when the accelerator pedal is released.

      Fuel cut off rpm: 

      2,500 rpm 

      Fuel return rpm: 

      1,200 rpm 

  3. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS 
    1. Check the appearance.
      1. Check if the indicated portions of the engine assembly are cracked, leaking or damaged.

        HINT:

        Disconnection of the engine oil level gauge, oil filler cap, PCV hose, etc. may cause the engine to run improperly. Disconnected, loose or cracked parts in the air induction system between the throttle body and cylinder head will allow air suction and cause the engine to run improperly.

        If necessary, repair the engine assembly.

        Fig 4: Inspecting Hoses, Connections And Gaskets
        G05109735Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT FUEL CUT OFF VALVE AND FILL CHECK VALVE 
    1. Disconnect the vent line hose from the fuel tank. (See REMOVAL )
    2. Connect the pressure gauge to the vent hose port.
    3. Fill the fuel tank with fuel.
    4. Apply pressure at 4 kPa (0.04 kgf*cm2 , 0.58 psi) to the vent port of the fuel tank.

      HINT:

      Check the amount of fuel left in the fuel tank.

    5. Remove the fuel tank cap, and check that the pressure decreases.

      If the pressure does not decrease, replace the fuel tank assembly.

      Fig 5: Identifying Fuel Tank Cap
      G05109736Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Reconnect the vent line hose to the fuel tank.
  5. CHECK AIR INLET LINE 
    1. Disconnect the air inlet line hose from the charcoal canister. (See REMOVAL  )
    2. Check that air flows freely into the air inlet line.

      If air does not flow freely into the air inlet line, repair or replace the air inlet line.

      Fig 6: Checking Air Flows Freely Into Air Inlet Line
      G05109737Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reconnect the air inlet line hose to the charcoal canister.
  6. INSPECT LEAK DETECTION PUMP PRESSURE SENSOR 
    1. Measure the power source voltage of the ECM connectors.

      Standard voltage 

      POWER SOURCE VOLTAGE OF ECM CONNECTORS

      Tester Connection Condition Specified Condition
      A23 (VC) - A28 (E2) Ignition switch ON 4.5 to 5.5 V

      If the voltage is not as specified, check the ECM, leak detection pump and wire harness.

    2. Measure the power output voltage of the ECM connectors.
      1. Remove the fuel tank cap.

        Standard voltage 

        POWER OUTPUT VOLTAGE OF ECM CONNECTORS

        Tester Connection Condition Specified Condition
        E22 (PPMP) - A28 (E2) Ignition switch ON 1.425 to 4.150 V

        If the voltage is not as specified, check the ECM, leak detection pump and wire harness.

      2. Install the fuel tank cap.
        Fig 7: Inspecting Leak Detection Pump Pressure Sensor Specification
        G05109738Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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