LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2008 >> FJ Cruiser RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 144 (Engine Control System (2UZ-FE)) >> SFI System >> DTC P0100 Mass Air Flow Circuit Malfunction: DTC P0102 Mass Air Flow Circuit Low: DTC P0103 Mass Air Flow Circuit High >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are 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 INTELLIGENT TESTER (MASS AIR FLOW RATE) 
    1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
    2. Allow the engine to idle.
    3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / MAF.
    4. Read the values displayed on the tester.

    Result 

    MASS AIR FLOW RATE CHART

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

    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. Turn the ignition switch ON.
    2. Disconnect the M1 Mass Air Flow (MAF) meter connector.
    3. Measure the voltage of the wire harness side connector.

    Standard voltage 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Specified Condition
    M1-1 (+B) - Body ground 9 to 14V

    NG: GO TO step   5

    Fig 1: Identifying M1 Mass Air Flow Meter Connector Terminals
    G05196623Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO Next Step 

  3. INSPECT ECM (VG VOLTAGE) 
    1. Start the engine.
    2. Measure the voltage of the E5 ECM connector.

      HINT:

      Move the shift lever to P or N and turn the A/C switch OFF.

      Standard voltage 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    E5-30 (VG) - E5-29 (E2G) Engine is idling 0.5 to 3.0 V

    OK: REPLACE ECM 

    Fig 2: Identifying E5 ECM Connector Terminals
    G05196624Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: GO TO Next Step 

  4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MASS AIR FLOW METER 

  5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - INTEGRATION RELAY) 
    1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ). NG

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK ECM POWER SOURCE CIRCUIT 

  6. INSPECT ECM (SENSOR GROUND) 
    1. Measure the resistance of the ECM connector.

      Standard resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Specified Condition
    E5-29 (E2G) - Body ground Below 1 Ω

    NG: REPLACE ECM 

    Fig 3: Identifying E2G Connector Terminal
    G05196625Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO Next Step 

  7. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MASS AIR FLOW METER 

scientia non olet · About LEMON Manuals