ECD SYSTEM (w/ EGR Cooler), Diagnostic DTC:P0100, P0102, P0103

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

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.

A01E1KIE02
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)
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)

Tech Tips

After confirming DTC P0100, P0102 or P0103, check the mass air flow ratio in the following menus: Powertrain / Engine / Data List / MAF using the intelligent tester.

Reference
Air Flow Value (gm/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

A01E2A4E03

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 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, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE OF INTELLIGENT TESTER (MAF)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the tester ON.

    3. Enter the following menus: Powertrain / Engine / Data List / MAF

    4. Read the value.

      Result
      Air flow rate (gm/sec.) Proceed to
      0.0 A
      174.0 or more B
      Between 1 and 173.0 C

    B

    INSPECT ECM (SENSOR GROUND) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

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


    1. Disconnect the A4 mass air flow meter connector.

    2. A01E1OJE16

      Turn the ignition switch ON.

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

      Standard voltage
      Tester Connection Specified Condition
      +B (A4-1) - Body ground 11 to 14 V

    NG

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

    OK

  3. INSPECT ECM (VG VOLTAGE)


    1. A01DXHUE14

      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 (E7-24) - EVG (E7-32) Engine is idling 0.5 to 3.4 V

    OK

    REPLACE ECM Click here

    NG

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


    1. A01DVECE08

      Disconnect the A4 mass air flow meter connector.

    2. Disconnect the E7 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      VG (A4-3) - VG (E7-24) Below 1 Ω
      E2G (A4-2) - EVG (E7-32) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      VG (A4-3) or VG (E7-24) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MASS AIR FLOW METER Click here

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

    A01E2GVE04

    1. Disconnect the A4 MAF meter connector.

    2. Remove the integration relay from the engine room junction block Click here.

    3. Disconnect the 1J integration relay connector.

    4. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      +B (A4-1) - 1J-5 Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      +B (A4-1) or 1J-5 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here

  6. INSPECT ECM (SENSOR GROUND)


    1. A01DXHUE15

      Measure the resistance of the ECM connector and body ground.

      Standard resistance
      Tester Connection Specified Condition
      EVG (E7-32) - Body ground Below 1 Ω

    NG

    REPLACE ECM Click here

    OK

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


    1. A01DVECE09

      Disconnect the A4 mass air flow meter connector.

    2. Disconnect the E7 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      VG (A4-3) - VG (E7-24) Below 1 Ω
      E2G (A4-2) - EVG (E7-32) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      VG (A4-3) or VG (E7-24) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MASS AIR FLOW METER Click here