СИСТЕМА SFI, Diagnostic DTC:P0102, P0103, P010C, P010D

DTC Code DTC Name
P0102 Mass Air Flow Circuit Low
P0103 Mass Air Flow Circuit High
P010C Mass or Volume Air Flow "A" Circuit Low Input
P010D Mass or Volume Air Flow "A" Circuit High Input

DESCRIPTION

The Mass Air Flow (MAF) meter is a sensor that measures the amount of air flowing through the valve.

The ECM uses this information to determine the fuel injection time and to provide appropriate air-fuel ratio.

Inside the MAF meter, there is a heated platinum wire which is exposed to the flow of intake air.

By applying a specific electrical current to the wire, the ECM heats it to a given temperature. The flow of incoming air cools both the wire and an internal thermistor, affecting their resistance. To maintain a constant current value, the ECM varies the voltage applied to the wire and internal thermistor. The voltage level is proportional to the airflow through the sensor, and the ECM uses it to calculate the intake air volume.

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

Tech Tips

When any of these DTCs are set, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is calculated by the ECM, according to the engine RPM and throttle valve position. Fail-safe mode continues until a pass condition is detected.

A001B88E03
DTC No. DTC Detection Condition Trouble Area

P0102

P010C

 Open in Mass Air Flow (MAF) meter circuit for 3 seconds

  • Open in MAF meter circuit


  • Short in MAF meter circuit


  • MAF meter


  • ECM

P0103

P010D

 Short in Mass Air Flow (MAF) meter circuit for 3 seconds

  • Short in MAF meter circuit (+B circuit)


  • MAF meter


  • ECM

Tech Tips

When any of these DTCs are set, check the air-flow rate by entering the following menus on the GTS: Powertrain / Engine / Data List / MAF Sensor 1 or MAF Sensor 2.

Mass Air Flow Rate (gm/sec) Malfunctions
Approximately 0.0

  • Open in Mass Air Flow (MAF) meter power source circuit

  • Open or short in VG circuit
271.0 or more

  • Open in EVG circuit

MONITOR DESCRIPTION

If there is a defect in the MAF meter or an open short circuit, the voltage level deviates from the normal operating range. The ECM interprets this deviation as a malfunction in the MAF meter and sets a DTC.

Example:

When the sensor output voltage remains less than 0.2 V, or more than 4.9 V, for more than 3 seconds, the ECM sets a DTC.

If the malfunction is not repaired successfully, a DTC is set 3 seconds after the engine is next started.

WIRING DIAGRAM

A001B92E08

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine conditions 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 GTS (MASS AIR FLOW RATE)


    1. Connect the GTS to the DLC3.

    2. Turn the GTS on.

    3. Wait 30 seconds with the engine stopped.

    4. Enter the following menus: Powertrain / Engine / Data List / MAF Sensor 1 or MAF Sensor 2.

    5. Read the values displayed on the GTS.

      Result
      Mass Air Flow Rate (gm/sec) Proceed to
      0.0 A
      0.26 or more B
      Between 1.0 and 0.25* C

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


    B

    INSPECT ECM (SENSOR GROUND) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

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

    A001BNEE01

    1. Disconnect the E13 or E22 MAF meter connector.

    2. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      E13-3 (+B) - Body ground Engine switch on (IG) 11 to 14 V
      E22-3 (+BR) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - EFI FUSE) Click here

    OK

  3. INSPECT ECM (VG VOLTAGE)

    A001B3JE01

    1. Start the engine.

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

      Tech Tips

      The transmission gear selector lever should be in the P or N position and the A/C switch should be turned OFF.

      Standard voltage
      Tester Connection Condition Specified Condition
      E1-25 (VG) - E1-24 (E2G) Engine idling 0.5 to 3.0 V
      E1-23 (VG2) - E1-32 (E2G2) Engine idling 0.5 to 3.0 V

    OK

    REPLACE ECM Click here

    NG

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

    A001BBME01

    1. Disconnect the E13 or E22 MAF meter connector.

    2. Disconnect the E1 ECM connector.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      E13-1 (VG) - E1-25 (VG) Always Below 1 Ω
      E13-2 (E2G) - E1-24 (E2G) Always Below 1 Ω
      E22-1 (VGR) - E1-23 (VG2) Always Below 1 Ω
      E22-2 (EVGR) - E1-32 (E2G2) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      E13-1 (VG) or E1-25 (VG) - Body ground Always 10 kΩ or higher
      E22-1 (VGR) or E1-23 (VG2) - Body ground Always 10 kΩ or higher

    OK

    REPLACE MASS AIR FLOW METER (BANK 1 OR BANK 2) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - EFI FUSE)

    A001BK7E02

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

    2. Inspect the fuse.


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

        Standard resistance
        Tester Connection Condition Specified Condition
        EFI fuse Always Below 1 Ω

    3. Disconnect the E13 or E22 MAF meter connector.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      E13-3 (+B) - EFI fuse terminal 2 Always Below 1 Ω
      E22-3 (+BR) - EFI fuse terminal 2 Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      E13-3 (+B) or EFI fuse terminal 2 - Body ground Always 10 kΩ or higher
      E22-3 (+BR) or EFI fuse terminal 2 - Body ground Always 10 kΩ or higher

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. INSPECT ECM (SENSOR GROUND)

    A001C5PE01

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E1-24 (E2G) - Body ground Always Below 1 Ω
      E1-32 (E2G2) - Body ground Always Below 1 Ω

    NG

    REPLACE ECM Click here

    OK

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

    A001BBME03

    1. Disconnect the E13 or E22 MAF meter connector.

    2. Disconnect the E1 ECM connector.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      E13-1 (VG) - E1-25 (VG) Always Below 1 Ω
      E13-2 (E2G) - E1-24 (E2G) Always Below 1 Ω
      E22-1 (VGR) - E1-23 (VG2) Always Below 1 Ω
      E22-2 (EVGR) - E1-32 (E2G2) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      E13-1 (VG) or E1-25 (VG) - Body ground Always 10 kΩ or higher
      E22-1 (VGR) or E1-23 (VG2) - Body ground Always 10 kΩ or higher

    OK

    REPLACE MASS AIR FLOW METER (BANK 1 OR BANK 2) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR