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Inspection Procedure

NOTE:
  • If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
  • Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
  1. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (INTAKE AIR TEMPERATURE) 
    1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
    2. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON.
    3. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR" and read its value displayed on the hand-held tester or the OBD II scan tool.

      Temperature: Same value as the actual intake air temperature. 

      Result: 

      READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL

      Temperature Displayed Proceed To
      -40 °C (-40°F) A
      140°C (284°F) Or More B
      OK (Same As Present Temperature) C
      NOTE:
      • If there is an open circuit, the hand-held tester or the OBD II scan tool indicates -40°C (-40°F).
      • If there is a short circuit, the hand-held tester or the OBD II scan tool indicates 140°C (284°F) or more.
    1. B : Go to step   4 . 
    2. C : CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
    3. A : Go to next step. 
  2. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR OPEN IN WIRE HARNESS) 
    1. Disconnect the M1 mass air flow sensor connector.
      2. Fig 1: Disconnecting M1 Mass Air Flow Sensor Connector
      G03367029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect terminals THA and E2 of the mass air flow sensor wire heraness side connector.
      3. Fig 2: Identifying Terminals THA & E2 Of Mass Air Flow Sensor
      G03367030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Turn the ignition switch ON.
    4. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR" and read its value displayed on the hand-held tester or the OBD II scan tool.

      Temperature value: 140°C (284°F) or more 

    5. Reconnect the mass air flow sensor connector.
    1. OK : CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE MASS AIR FLOW SENSOR 
    2. NG : Go to next step. 
  3. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR OPEN IN ECM) 
    1. Disconnect the M1 mass air flow sensor connector.
      2. Fig 3: M1 Mass Air Flow Sensor Connecting Diagram
      G03367031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect terminals THA and E2 of the E3 ECM connector.
      Fig 4: Identifying Terminals THA & E2 Of E3 ECM Connector
      G03367032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Before checking, do a visual and contact pressure check for the ECM connector.
    3. Turn the ignition switch ON.
    4. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR" and read its value displayed on the hand-held tester or the OBD II scan tool.

      Temperature value: 140°C (284°F) or more 

    5. Reconnect the mass air flow sensor connector.
    1. OK : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. NG : CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM (See  REPLACEMENT  ) 
  4. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR SHORT IN WIRE HARNESS) 
    1. Disconnect the M1 mass air flow sensor connector.
      2. Fig 5: M1 Mass Air Flow Sensor Connector Connecting Diagram (1 Of 2)
      G03367033Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON.
    3. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR" and read its value displayed on the hand-held tester or the OBD II scan tool.

      Temperature value: -40°C (-40°F) 

    4. Reconnect the mass air flow meter connector.
    1. OK : REPLACE MASS AIR FLOW METER 
    2. NG : Go to next step. 
  5. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR SHORT IN ECM) 
    1. Disconnect the E3 ECM connector.
      2. Fig 6: M1 Mass Air Flow Sensor Connector Connecting Diagram (1 Of 2)
      G03367034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON.
    3. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR" and read its value displayed on the hand-held tester or the OBD II scan tool.

      Temperature value: -40°C (-40°F) 

    4. Reconnect the ECM connector.
      Fig 7: Identifying E3 ECM Connector
      G03367035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. NG : REPLACE ECM (See  REPLACEMENT  ) 
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