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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System (SFI) - Diagnostics (2AZ-FE)) >> DTC P0100, P0102, P0103: Mass Or Volume Air Flow Circuit >> Inspection Procedure

Inspection Procedure

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

HINT:

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, freeze frame data can help determine if the vehicle was running or stopped, 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 OF HAND-HELD TESTER OR OBD II SCAN TOOL (MAF RATE) 
    1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
    2. Start the engine.
    3. Push the hand-held tester or the OBD II scan tool main switch ON.
    4. On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/MAF. Read the values.

      Result: 

      HAND HELD TESTER RESULT (MAF RATE)

      Air Flow Rate (gm/second) Proceed to
      0.0 A
      271.0 or more B
      MAF rate greater than 1 but less than 270.0 (1) C
      (1) The value must change when the throttle valve is opened or closed.

    HINT:

    *: The value must change when the throttle valve is opened or closed.

    1. B: Go to step   6 
    2. C: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
    3. A: GO TO NEXT STEP. 
  2. CHECK MASS AIR FLOW METER (POWER SOUCE VOLTAGE) 
    1. Turn the ignition switch ON.
    2. Disconnect the M1 MAF meter connector.
    3. Measure the voltage of the wire harness side connector.
      Fig 1: Identifying MAF Meter Connector Terminals
      G02907776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      M1-1 (+B) - Body ground 9 to 14 V
    1. NG: Go to step   5 
    2. OK: Go to next Step. 
  3. INSPECT ECM (VG VOLTAGE) 
    1. Start the engine.
    2. Measure the voltage of the ECM connector.
      Fig 2: Identifying E7 ECM Connector Terminals
      G02907777Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Condition Specified Condition
      E7-30 (VG) - E7-29 (EVG) Engine is idling 0.5 to 3.0 V

      HINT:

      The shift position should be P or N and the A/C switch should be turned OFF.

    1. OK: REPLACE ECM (See  REPLACEMENT  ) 
    2. NG: GO TO NEXT STEP. 
  4. CHECK WIRE HARNESS (MAF METER - ECM) 
    1. Disconnect the M1 MAF meter connector.
    2. Disconnect the E7 ECM connector.
    3. Measure the resistance of the wire harness side connectors.
      Fig 3: Identifying MAF Meter And ECM Connector Terminals
      G02907778Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      M1-3 (VG)- E7-30 (VG) M1-2 (EVG)- E7-29 (EVG) Below 1 Ω
      M1-3 (VG) or E7-30 (VG) - Body ground 10 kΩ or higher
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE MASS AIR FLOW METER 
  5. CHECK WIRE HARNESS (MAF METER - EFI RELAY) 
    1. Disconnect the M1 MAF meter connector.
    2. Remove the EFI relay from the engine room J/B.
    3. Measure the resistance of the wire harness side connectors.
      Fig 4: Identifying MAF Meter Connector Terminals And EFI Relay Location
      G02907779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      M1-1 (+B) - J/B EFI relay terminal 3 Below 1 Ω
      M1-1 (+B) or J/B EFI relay terminal 3 - Body ground 10 kΩ or higher
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: INSPECT ECM POWER SOURCE CIRCUIT (See  ECM POWER SOURCE CIRCUIT  ) 
  6. INSPECT ECM (SENSOR GROUND) 
    1. Measure the resistance of the ECM connector.
      Fig 5: Identifying E7 ECM Connector Terminals
      G02907780Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      E7-29 (EVG) - Body ground Below 1 Ω
    1. NG: REPLACE ECM (See  REPLACEMENT  ) 
    2. OK: GO TO NEXT STEP. 
  7. CHECK WIRE HARNESS (MAF METER - ECM) 
    1. Disconnect the M1 MAF meter connector.
    2. Disconnect the E7 ECM connector.
    3. Measure the resistance of the wire harness side connectors.
      Fig 6: Identifying MAF Meter And E7 ECM Connector Terminals
      G02907781Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      M1-3 (VG)- E7-30 (VG) M1-2 (EVG)- E7-29 (EVG) Below 1 Ω
      M1-3 (VG) or E7-30 (VG) - Body ground 10 kΩ or higher
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE MASS AIR FLOW METER 
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