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Home >> Toyota >> 2008 >> FJ Cruiser RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 238 (Engine Control System (1NZ-FE)) >> SFI System >> DTC P0100 Mass or Volume Air Flow Circuit; DTC P0102 Mass or Volume Air Flow Circuit Low Input; DTC P0103 Mass or Volume Air Flow Circuit High Input >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Read freeze frame data using a Techstream. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

  1. READ VALUE USING TECHSTREAM (MASS AIR FLOW RATE) 
    1. Connect a Techstream to the DLC3.
    2. Start the engine.
    3. Turn the tester ON.
    4. Select the following menu items: Powertrain / Engine and ECT / Data List / All Data / MAF.
    5. Read the values displayed on the tester.

      Result 

      RESULT CHART

      Mass Air Flow Rate (g/sec) Proceed To
      0.0 A
      271.0 or more B
      Between 1.0 and 270.0 ((1)) C
      (1) The value must be changed when the throttle valve is open or closed with the engine running.

    B:  Go to step  6

    C: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS   ) 

    A: Go to next step 

  2. INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE) 
    1. Disconnect the C26 Mass Air Flow (MAF) meter connector.
      2. Fig 1: Identifying C26 Mass Air Flow (MAF) Meter Connector Terminals
      G04828059Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Measure the voltage between the terminal of the wire harness side connector and body ground.

      Standard voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      +B (C26-1) - Body ground 11 to 14 V
    4. Reconnect the MAF meter connector.

    NG:  Go to step  5

    OK: Go to next step 

  3. INSPECT MASS AIR FLOW METER (VG VOLTAGE) 
    Fig 2: Identifying Mass Air Flow Meter (VG Voltage)
    G04828060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Output voltage inspection.
      1. Apply battery voltage across terminals +B and E2G.
      2. Connect the positive (+) tester prove to terminal VG, and negative (-) tester prove to terminal E2G.
      3. Check the voltage.

        Standard voltage 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        VG (3) - E2G (2) 0.2 to 4.9 V

    NG: REPLACE MASS AIR FLOW METER (See  REMOVAL   ) 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the C26 MAF meter connector.
      2. Fig 3: Identifying C26 MAF Meter And C20 ECM Connectors Terminals
      G04828061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the C20 ECM connector.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      VG (C26-3) - VG (C20-118) Below 1 Ω
      E2G (C26-2) - E2G (C20-116)

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      VG (C26-3) or VG (C20-118) - Body ground 10 kΩ or higher
    4. Reconnect the MAF meter connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM (See  REMOVAL   ) 

  5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - INTEGRATION RELAY) 
    Fig 4: Identifying Harness And Connector (Mass Air Flow Meter - Integration Relay)
    G04828062Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C26 MAF meter connector.
    2. Remove the integration relay from the engine room Relay Block (R/B).
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      +B (C26-1) - 1A-4 Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      +B (C26-1) or 1A-4 - Body ground 10 kΩ or higher
    4. Reconnect the MAF meter connector.
    5. Reinstall the integration relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK ECM POWER SOURCE CIRCUIT (See  ECM POWER SOURCE CIRCUIT   ) 

  6. CHECK HARNESS AND CONNECTOR (SENSOR GROUND) 
    1. Disconnect the C26 MAF meter connector.
      2. Fig 5: Identifying C26 MAF Meter Connector Terminals
      G04828063Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the resistance.

      Standard resistance 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      E2G (C26-2) - Body ground Below 1 Ω
    3. Reconnect the MAF meter connector.

    OK: REPLACE MASS AIR FLOW METER (See  REMOVAL   ) 

    NG: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    Fig 6: Identifying Harness And Connector (Mass Air Flow Meter - ECM)
    G04828061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C26 MAF meter connector.
    2. Disconnect the C20 ECM connector.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      VG (C26-3) - VG (C20-118) Below 1 Ω
      E2G (C26-2) - E2G (C20-116)

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      VG (C26-3) or VG (C20-118) - Body ground 10 kΩ or higher
    4. Reconnect the MAF meter connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM (See  REMOVAL   ) 

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