ECD SYSTEM (w/o DPF), Diagnostic DTC:P0100, P0102, P0103

DTC Code DTC Name
P0100 Mass or Volume Air Flow Circuit
P0102 Air Flow Meter Circuit Low Input
P0103 Air Flow Meter Circuit High Input

DESCRIPTION

The mass air flow meter uses a platinum hot wire. The mass air flow meter consists of a platinum hot wire, a temperature sensor and a control circuit installed in a plastic housing. The mass air flow meter works on the principle that the hot wire and temperature sensor located in the intake air by-pass of the housing detect any changes in the intake air temperature.

The hot wire is maintained at the predetermined temperature by controlling the current flow through the hot wire. This current flow is then related as the output voltage of the mass air flow meter.

The circuit is constructed so that the platinum hot wire and temperature sensor provide a bridge circuit, with the power transistor controlled so that the potential of A and B remains equal to maintain the predetermined temperature.

A01BEGLE02
DTC No. DTC Detection Condition Trouble Area
P0100

Open or short in mass air flow meter circuit for more than 3 seconds with engine speed at 2,000 rpm or less

(1 trip detection logic)

  • Open or short in mass air flow meter circuit

  • Mass air flow meter

  • ECM
P0102

Open in mass air flow meter circuit for more than 3 seconds with engine speed at 2,000 rpm or less

(1 trip detection logic)

  • Open in mass air flow meter circuit

  • Mass air flow meter

  • ECM
P0103

Short in mass air flow meter circuit for more than 3 seconds with engine speed at 2,000 rpm or less

(1 trip detection logic)

  • Short in mass air flow meter circuit

  • Mass air flow meter

  • ECM

Tech Tips

After confirming DTC P0100, P0102 or P0103, check the mass air flow ratio by selecting the following menu items on an intelligent tester: Powertrain / Engine / Data List / MAF.

Reference
Air Flow Rate (g/sec) Malfunction
Approximately 0.0

  • Open in mass air flow meter power source circuit

  • Open or short in VG circuit
174.0 or more

  • Open in EVG circuit

WIRING DIAGRAM

A01BH0HE01

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

Tech Tips

Read freeze frame data using an intelligent tester. 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.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (MAF)


    1. Connect an intelligent tester to the DLC3.

    2. Start the engine and turn the tester ON.

    3. Select the following menu items: Powertrain / Engine / Data List / MAF.

    4. Read the value.

      Result
      Air Flow Rate (g/sec) Proceed To
      0.0 A
      174.0 or more B
      Between 1 and 173.0 (*1) C
      *1: The value should change in accordance with engine speed.

    B

    INSPECT ECM (SENSOR GROUND) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS

    A

  2. INSPECT MASS AIR FLOW METER (POWER SOURCE CIRCUIT)


    1. Disconnect the A27 mass air flow meter connector.

    2. A01BECBE14

      Turn the ignition switch to ON.

    3. Measure the voltage of the wire harness side connector and the body ground.

      Standard voltage
      Tester Connection Specified Condition
      +B (A27-1) - Body ground 11 to 14 V

    4. Reconnect the mass air flow meter connector.


    NG

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - MAIN RELAY) Click here

    OK

  3. INSPECT ECM (VG VOLTAGE)


    1. A01BADOE07

      Start the engine.

    2. Measure the voltage of the ECM connector.

      Tech Tips

      The A/C switch should be turned OFF.

      Standard voltage
      Tester Connection Condition Specified Condition
      VG (D3-24) - EVG (D3-32) Engine idling 0.2 to 3.1 V

    OK

    REPLACE ECM

    NG

  4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)


    1. A01BB2DE06

      Disconnect the A27 mass air flow meter connector.

    2. Disconnect the D3 ECM connector.

    3. Check the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      VG (A27-3) - VG (D3-24) Below 1 Ω
      E2G (A27-2) - EVG (D3-32) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      VG (A27-3) or VG (D3-24) - Body ground 10 kΩ or higher

    4. Reconnect the mass air flow meter connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MASS AIR FLOW METER

  5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - MAIN RELAY)

    A01BD3YE01

    1. Disconnect the A27 MAF meter connector.

    2. Remove the integration relay (MAIN relay) from the No.1 engine room R/B and J/B.

    3. Check the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      +B (A27-1) - Integration relay (1J-4) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      +B (A27-1) or Integration relay (1J-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

  6. INSPECT ECM (SENSOR GROUND)


    1. A01BADOE08

      Measure the resistance of the ECM connector and body ground.

      Standard resistance
      Tester Connection Specified Condition
      EVG (D3-32) - Body ground Below 1 Ω

    NG

    REPLACE ECM

    OK

  7. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)


    1. A01BB2DE07

      Disconnect the A27 mass air flow meter connector.

    2. Disconnect the D3 ECM connector.

    3. Check the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      VG (A27-3) - VG (D3-24) Below 1 Ω
      E2G (A27-2) - EVG (D3-32) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      VG (A27-3) or VG (D3-24) - Body ground 10 kΩ or higher

    4. Reconnect the mass air flow meter connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MASS AIR FLOW METER