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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.
      Fig 1: Identifying ECM Connector Terminals
      G05271631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      E9-22 (A1A+) - E7-1 (E2) Ignition switch ON 3.3 V
      E9-30 (A1A-) - E7-1 (E2) Ignition switch ON 3.0 V
      E9-23 (A2A+) - E7-1 (E2) ignition switch ON 3.3 V
      E9-31 (A2A-) - E7-1 (E2) Ignition switch ON 3.0 V
      NOTE: Connect test leads to the connector's backside. The connectors should not be disconnected from the ECM.

      HINT:

      Voltage of the ECM is kept constant regardless of the voltage of the air fuel ratio sensor.

    2. Connect an intelligent tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the Data Link Connector 3 (DLC3).
      Fig 2: Connecting Intelligent Tester To CAN VIM
      G05202415Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Select "DATA LIST". Then select "AFS B1 S1", "AFS B2 S1", "O2S B1 S2" and "O2S B2 S2" to display the monitors.
    4. Warm up the air fuel ratio sensor with the engine speed at 2,500 rpm for approximately 2 minutes.
    5. Maintain the engine speed at 2,500 rpm and confirm that the displays of "AFS B1 S1" and "AFS B2 S1" are as shown below.

      HINT:

      • The illustration may differ slightly from the display on the intelligent tester.
      • Only the intelligent tester displays the waveform of the air fuel ratio sensor.
    6. Confirm that the display of "O2S B1 S2" and "O2S B2 S2" changes between 0 and 1 V with the engine speed at 2,500 rpm.
      Fig 3: Identifying Air Fuel Ratio Graph
      G05200943Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT FUEL CUT OFF/RESTART RPM 
    1. Increase the engine speed to at least 2,500 rpm.
    2. Use a sound scope to check for injector operating sounds.
    3. Check that when the throttle lever is released, injector operation sound stops momentarily (at 2,500 rpm) and then resumes (at 1,200 rpm).

      Standard 

      STANDARD REFERENCE

      Item Specified Condition
      Fuel cut off rpm 1,800 rpm
      Fuel injector restart rpm 1,500 rpm
  3. VISUALLY INSPECT HOSE, CONNECTIONS AND GASKETS 
    1. Check for cracks, leaks or damage.
      Fig 4: Checking Engine For Cracks, Leaks Or Damage
      G05239290Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      Separation of the engine oil dipstick, oil filler cap, PCV hose, etc. may causes the engine to run improperly. Disconnection, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will allow air suction and cause the engine to run improperly.

  4. CHECK AIR INLET LINE 
    1. Disconnect the air inlet line hose from the charcoal canister.
    2. Check the air can flow freely in to the air inlet line. If air cannot flow freely in to the air inlet line, repair or replace it.
      Fig 5: Checking Air Flow Into Air Inlet Line
      G05200954Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reconnect the air inlet line hose to the charcoal canister.
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