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Home >> Toyota >> 2007 >> RAV4 Base, 3.5 K, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Control System (2AZ-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
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Inspection Procedure

WARNING: This page is about a different variant/trim than selected.

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records 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 INTELLIGENT TESTER (MASS AIR FLOW RATE) 
    1. Connect the intelligent tester to the DLC3.
    2. Start the engine.
    3. Turn the tester ON.
    4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / MAF.
    5. Read the values displayed on the tester.

    Result 

    RESULT

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

    B: GO to step  6

    C: CHECK FOR INTERMITTENT PROBLEMS 

    A: GO to next step 

  2. INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE) 
    1. Disconnect the B1 Mass Air Flow (MAF) meter connector.
    2. Turn the ignition switch ON.
    3. Measure the voltage between the terminal of the wire harness side connector and body ground.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      B1-3 (+B) - Body ground 9 to 14 V
    4. Reconnect the MAF meter connector.

    NG: GO to step  5

    Fig 1: Identifying B1 Connector Terminals
    G05183493Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO to next step 

  3. INSPECT MASS AIR FLOW METER (VG VOLTAGE) 
    1. Output voltage inspection.
      1. Apply battery voltage across terminals +B and E2G.
      2. Connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
      3. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      5 (VG) - 4 (E2G) 0.2 to 4.9 V

    NG: REPLACE MASS AIR FLOW METER 

    Fig 2: Identifying Mass Air Flow Meter Connector Terminals
    G04973489Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO to next step 

  4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the B1 MAF meter connector.
    2. Disconnect the B30 ECM connector.
    3. Measure the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      B1-5 (VG) - B30 - 118(VG) Below 1 Ω
      B1-4 (E2G) - B30-116 (E2G) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      B1-S (VG) or B30-118 (VG) - Body ground 10 kΩ or higher
    4. Reconnect the MAF meter connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 3: Identifying B1 And B30 Connectors Terminals
    G05183495Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM 

  5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - INTEGRATION RELAY) 
    1. Check the EFI No. 1 fuse.
    2. Disconnect the B1 MAF meter connector.
    3. Remove the integration relay from the engine room No. 1 relay block.
    4. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      B1-3 (+B) - 1A-4 Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      B1-3 (+B) or 1A-4 - Body ground 10 kΩ or higher
    5. Reconnect the MAF meter connector.
    6. Reinstall the integration relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 4: Checking Harness And Connector (Mass Air Flow Meter - Integration Relay)
    G05183496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: CHECK ECM POWER SOURCE CIRCUIT 

  6. CHECK HARNESS AND CONNECTOR (SENSOR GROUND) 
    1. Disconnect the B1 MAF meter connector.
    2. Measure the resistance.

    Standard resistance 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connections Specified Conditions
    B1-4 (E2G) - Body ground Below 1 Ω

    OK: REPLACE MASS AIR FLOW METER 

    Fig 5: Identifying B1 Connector Terminals
    G05183497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: GO to next step 

  7. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the B1 MAF meter connector.
    2. Disconnect the B30 ECM connector.
    3. Measure the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      B1-5 (VG) - B30-118 (VG) Below 1 Ω
      B1-4 (E2G) - B30-116 (E2G) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      B1-5 (VG) or B30-118 (VG) - Body ground 10 kΩ or higher
    4. Reconnect the MAF meter connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 6: Checking Harness And Connector (Mass Air Flow Meter - ECM)
    G05183495Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM 

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