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

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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
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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 an 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 these components in the MAF meter. 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.

Tip:

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.

DTC No. DTC Detection Condition Trouble Area

P0102

P010C

Open in Mass Air Flow (MAF) meter (for Bank 1, 2) circuit for 3 seconds

(1 trip detection logic)

  • Open in MAF meter (for Bank 1, 2) circuit


  • Short in ground circuit


  • MAF meter (for Bank 1, 2)


  • ECM

P0103

P010D

Short in Mass Air Flow (MAF) meter (for Bank 1, 2) circuit for 3 seconds

(1 trip detection logic)

  • Short in MAF meter circuit (+B circuit)


  • MAF meter (for Bank 1, 2)


  • ECM
Tip:

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

Table 1. Reference
Mass Air Flow Rate (gm/sec.) Malfunction
Approximately 0.0

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


  • Open or short in VG (VGR) circuit

160.0 or more

  • Open in E2G (EVGR) circuit
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MONITOR DESCRIPTION

If there is a defect in the MAF meter or an open or 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.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

  • Read freeze frame data using the GTS. 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, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

  • When viewed from the rear of the engine assembly, Bank 1 is on the left side and Bank 2 is on the right side.

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PROCEDURE


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    READ DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    5. Read the DTCs.

      Table 2. Result
      Result Proceed to
      DTC P0102 is output A
      DTC P0103 is output B

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    INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE)


    1. Disconnect the E13 or E22 MAF meter connector.

    2. 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 Power switch on (IG) 11 to 14 V
      E22-3 (+BR) - Body ground Power switch on (IG) 11 to 14 V

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    INSPECT ECM (VG VOLTAGE)


    1. Put the engine in inspection mode (see pageClick here).

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

      Tip:

      The shift 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

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


    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

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


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

    2. Disconnect the E13 or E22 MAF meter connector.

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

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

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    INSPECT ECM (SENSOR GROUND)


    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

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


    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

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    REPLACE ECMClick here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE MASS AIR FLOW METER (for Bank 1 or Bank 2)Click here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK ECM POWER SOURCE CIRCUITClick here

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    REPLACE ECMClick here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE MASS AIR FLOW METER (for Bank 1 or Bank 2)Click here