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

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

The Mass Air Flow (MAF) 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 hot wire and temperature sensor (located in the intake air by-pass of the housing) detect 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 used 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.

Table 1. P0100
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 3 seconds Mass air flow (MAF) meter voltage is 0.2 V or less, or 4.9 V or more with the engine speed at 4000 rpm or less for 3 seconds (1 trip detection logic).

  • Open or short in Mass Air Flow (MAF) meter circuit

  • Mass air flow meter

  • ECM
Table 2. P0102
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 3 seconds MAF meter voltage is 0.2 V or less with the engine speed at 4000 rpm or less for 3 seconds (1 trip detection logic).

  • Open in Mass Air Flow (MAF) meter circuit

  • Mass air flow meter

  • ECM
Table 3. P0103
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 3 seconds MAF meter voltage is 4.9 V or more with the engine speed at 4000 rpm or less for 3 seconds (1 trip detection logic).

  • Shot in Mass Air Flow (MAF) meter circuit

  • Mass air flow meter

  • ECM
Table 4. Related Data List
DTC No. Data List
P0100 MAF
P0102
P0103
Tip:

  • If DTC P0100, and/or P0102 is stored, the following symptoms may appear (as the ECU mistakenly determines that there is less air than the actual intake air amount, EGR is decreased to match the target EGR):


    • Combustion noise worsens

  • If DTC P0100, and/or P0103 is stored, the following symptoms may appear (as the ECU mistakenly determines that there is more air than the actual intake air amount, EGR is increased to match the target EGR):


    • Misfire

    • White smoke

    • Black smoke

  • After confirming DTC P0100, P0102 or P0103, check the mass air flow ratio by entering the following menus: Powertrain / Engine / Data List / MAF.

    Table 5. Reference:
    Air Flow Value (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
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

Tip:

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.

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (MASS AIR FLOW RATE)


    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.

      Table 6. Result
      Result Proceed to
      0.0 A
      174.0 or more B
      Between 1 and 173.0* C
      Tip:

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


  2. Click here

    INSPECT MASS AIR FLOW METER (POWER SOURCE CIRCUIT)


    1. Disconnect the mass air flow meter connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C50-1 (+B) - Body ground Ignition switch ON 11 to 14 V

  3. Click here

    INSPECT MASS AIR FLOW METER


    1. Inspect the mass air flow meter (Click here).


  4. Click here

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


    1. A015BKGE01

      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)
      Table 7. for LHD
      Tester Connection Condition Specified Condition
      C50-3 (VG) - C45-72 (VG) Always Below 1 Ω
      C50-2 (E2G) - C45-118 (EVG) Always Below 1 Ω
      Table 8. for RHD
      Tester Connection Condition Specified Condition
      C50-3 (VG) - C46-72 (VG) Always Below 1 Ω
      C50-2 (E2G) - C46-118 (EVG) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Table 9. for LHD
      Tester Connection Condition Specified Condition
      C50-3 (VG) or C45-72 (VG) - Body ground Always 10 kΩ or higher
      Table 10. for RHD
      Tester Connection Condition Specified Condition
      C50-3 (VG) or C46-72 (VG) - Body ground Always 10 kΩ or higher

  5. Click here

    INSPECT FUSE (EFI NO. 2)


    1. Remove the EFI NO. 2 fuse from the engine room relay block.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      EFI NO. 2 fuse Always Below 1 Ω

  6. Click here

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ENGINE ROOM RELAY BLOCK)


    1. A015A4PE01

      Disconnect the mass air flow meter connector.

    2. Remove the EFI NO. 2 fuse from the engine room relay block.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C50-1 (+B) - EFI NO. 2 fuse (2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C50-1 (+B) or EFI NO. 2 fuse (2) - Body ground Always 10 kΩ or higher

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    CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK)


    1. Remove the EFI NO. 2 fuse from the engine room relay block.

    2. Remove the integration relay from the engine room relay block.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      EFI NO. 2 fuse (1) - 1B-4 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      EFI NO. 2 fuse (1) or 1B-4 - Body ground Always 10 kΩ or higher

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    CHECK HARNESS AND CONNECTOR (SENSOR GROUND)


    1. A01555CE11

      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 Condition Specified Condition
      C50-2 (E2G) - Body ground Always Below 1 Ω

  9. Click here

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


    1. A015BKGE01

      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)
      Table 11. for LHD
      Tester Connection Condition Specified Condition
      C50-3 (VG) - C45-72 (VG) Always Below 1 Ω
      C50-2 (E2G) - C45-118 (EVG) Always Below 1 Ω
      Table 12. for RHD
      Tester Connection Condition Specified Condition
      C50-3 (VG) - C46-72 (VG) Always Below 1 Ω
      C50-2 (E2G) - C46-118 (EVG) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Table 13. for LHD
      Tester Connection Condition Specified Condition
      C50-3 (VG) or C45-72 (VG) - Body ground Always 10 kΩ or higher
      Table 14. for RHD
      Tester Connection Condition Specified Condition
      C50-3 (VG) or C46-72 (VG) - Body ground Always 10 kΩ or higher

  10. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  11. Click here

    REPLACE MASS AIR FLOW METER


    1. Replace the mass air flow meter (Click here).


  12. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR


  13. Click here

    CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE


  14. Click here

    CHECK ECM POWER SOURCE CIRCUIT


    1. Check the ECM power source circuit (Click here).


  15. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs (Click here).

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON for 3 seconds

    5. Enter the following menus: Powertrain / Engine / DTC.

    6. Confirm that the DTC is not output again.


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    END