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Home >> Toyota >> 2009 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Control System (1AR-FE) - DTC P0010 - P0120/P0121/P0122/P0123/P0220/P0222/P0223/P2135) >> 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 variant/trim than selected.
NOTE: Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 DTC OUTPUT 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain/Engine/Trouble Codes.
    5. Wait 30 seconds, and read the DTCs.

      Result 

      RESULT CHART

      Result Proceed to
      DTC P0102 is output A
      DTC P0103 is output B

      B: Go to step  5

      A: Go to next step 

  2. INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE) 
    1. Disconnect the mass air flow meter connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      B10-3 (+B) - Body ground Ignition switch ON 11 to 14 V
    4. Reconnect the mass air flow meter connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - MASS AIR FLOW METER) 

      Fig 1: Identifying Mass Air Flow Meter Connector
      G06110929Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the mass air flow meter connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      B10-5 (VG) - B50-11 (VG) Always Below 1 Ω
      B10-4 (E2G) - B50-5 (E2G)

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      B10-5 (VG) or B50-11 (VG) - Body ground Always 10 kΩ or higher
    4. Reconnect the mass air flow meter connector.
    5. Reconnect the ECM connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 2: Identifying Mass Air Flow Meter And ECM Connector
      G06110930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  4. INSPECT MASS AIR FLOW METER 
    1. Perform On-vehicle Inspection (See ON-VEHICLE INSPECTION ).
    2. Perform Inspection (See INSPECTION ).
    3. Inspect the function of the mass air flow meter.
      1. Remove the mass air flow meter with the connector connected.
      2. Connect the Techstream to the DLC3.
      3. Turn the ignition switch to ON.
      4. Turn the Techstream to the DLC3.
      5. Enter the following menus: Powertrain/Engine/Data List/All Data/MAF.
      6. Blow air to the mass air flow meter and check that the intake air amount reading changes.

        OK: 

        The reading changes. 

        NG: REPLACE MASS AIR FLOW METER  (See REMOVAL )

        Fig 3: Identifying Mass Air Flow Meter
        G06023579Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        OK: REPLACE ECM  (See REMOVAL )

  5. CHECK HARNESS AND CONNECTOR (SENSOR GROUND) 
    1. Disconnect the mass air flow meter connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      B10-4 (E2G) - Body ground Always Below 1 Ω
    3. Reconnect the mass air flow meter connector.

      NG: Go to step 6 

      Fig 4: Identifying Mass Air Flow Meter Connector
      G06110932Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE MASS AIR FLOW METER  (See REMOVAL )

  6. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the mass air flow meter connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      B10-5 (VG) - B50-11 (VG) Always Below 1 Ω
      B10-4 (E2G) - B50-5 (E2G)

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      B10-5 (VG) or B50-11 (VG) - Body ground Always 10 kΩ or higher
    4. Reconnect the mass air flow meter connector.
    5. Reconnect the ECM connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 5: Identifying Mass Air Flow Meter And ECM Connector
      G06110930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE ECM  (See REMOVAL )

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