Dtc P0102 Mass Or Volume Air Flow Circuit Low Input

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Tr-Fbe Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ DTC OUTPUT

INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE)

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

CHECK MASS AIR FLOW METER

CHECK HARNESS AND CONNECTOR (SENSOR GROUND)

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

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - INTEGRATION RELAY [MAIN RELAY])

DTC P0102 Mass or Volume Air Flow Circuit Low Input

DTC P0103 Mass or Volume Air Flow Circuit High Input


DESCRIPTION

The mass air flow meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM uses this information to determine the fuel injection time and to provide the appropriate air fuel ratio.
Inside the mass air flow 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 air flow 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 temperature sensor create a bridge circuit, and the power transistor is controlled so that the potentials of A and B remain equal to maintain the predetermined temperature.
HINT:
When any of these DTCs are stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is calculated by the ECM, according to the engine speed and throttle valve position. The ECM continues operating in fail-safe mode until a pass condition is detected.

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P0102 Mass Or Volume Air Flow Circuit Low Input


DTC No.
DTC Detection Condition
Trouble Area
P0102
The mass air flow meter voltage is below 0.2 V for 3 seconds (1-trip detection logic).
  1. Open or short in mass air flow meter circuit
  2. Mass air flow meter
  3. ECM
P0103
The mass air flow meter voltage is higher than 4.9 V for 3 seconds (1-trip detection logic).
  1. Open or short in mass air flow meter circuit
  2. Mass air flow meter
  3. ECM

HINT:
When any of these DTCs are output, check the air flow rate using the intelligent tester. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.

Mass Air Flow Rate (g/ms)
Malfunction
Approximately 0.0
  1. Open in mass air flow meter power source circuit
  2. Open or short in VG circuit
160.0 or more
  1. Open in E2G circuit

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P0102 Mass Or Volume Air Flow Circuit Low Input


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
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, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.READ DTC OUTPUT

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the tester on.

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.

  1. Read the values displayed on the tester.

    Result
    Result
    		Proceed to
    DTC P0102 is output
    		A
    DTC P0103 is output
    		B


B
Go to step 5
A


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


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P0102 Mass Or Volume Air Flow Circuit Low Input

  1. Disconnect the mass air flow meter connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C36-1 (+B) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Mass Air Flow Meter)

  1. Reconnect the mass air flow meter connector.



NG
Go to step 7
OK


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

  1. Disconnect the mass air flow meter connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C36-3 (VG) - C95-13 (VG)
    		Always
    		Below 1 Ω
    C36-2 (E2G) - C95-7 (E2G)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C36-3 (VG) or C95-13 (VG) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the mass air flow meter connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK MASS AIR FLOW METER

  1. Inspect the mass air flow meter, referring to the On-vehicle Inspection for Mass Air Flow Meter (HILUX_TGN26 RM000000Q2D08DX.html).

  1. Inspect the mass air flow meter, referring to the Inspection for Mass Air Flow Meter (HILUX_TGN26 RM000000VW401FX_01_0001.html).

  1. Inspect the function of the mass air flow meter.

    1. Connect the Techstream to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the Techstream on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.

    5. Start the engine.

    6. Check that the MAF value changes when the engine is raced.

      OK:
      The reading changes.


NG
REPLACE MASS AIR FLOW METER (HILUX_TGN26 RM000000VW602DX_01_0002.html)
OK

REPLACE ECM (HILUX_TGN26 RM000000VW2024X.html)

5.CHECK HARNESS AND CONNECTOR (SENSOR GROUND)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P0102 Mass Or Volume Air Flow Circuit Low Input

  1. Disconnect the mass air flow meter connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C36-2 (E2G) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Mass Air Flow Meter)

  1. Reconnect the mass air flow meter connector.



NG
Go to step 6
OK

REPLACE MASS AIR FLOW METER

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

  1. Disconnect the mass air flow meter connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C36-2 (E2G) - C95-7 (E2G)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C36-2 (E2G) or C95-7 (E2G) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the mass air flow meter connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER - ECM)
OK

REPLACE ECM

7.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - INTEGRATION RELAY [MAIN RELAY])

  1. Disconnect the mass air flow meter connector.

  1. Remove the integration relay (MAIN relay) from the engine room relay block.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C36-1 (+B) - 1J-5
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C36-1 (+B) or 1J-5 - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the integration relay.

  1. Reconnect the mass air flow meter connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER - INTEGRATION RELAY [MAIN RELAY])
OK

REPLACE INTEGRATION RELAY