Dtc P0100 Mass Air Flow Circuit Malfunction

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Kd-Ftv Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT MASS AIR FLOW METER (POWER SOURCE CIRCUIT)

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

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - NO. 1 INTEGRATION RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK ECM POWER SOURCE CIRCUIT

REPLACE MASS AIR FLOW METER

CHECK WHETHER DTC OUTPUT RECURS

REPLACE ECM

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P0100 Mass Air Flow Circuit Malfunction


DESCRIPTION

The intake mass air flow meter assembly consists of a platinum hot wire, temperature sensor and control circuit installed in a plastic housing. The temperature sensor (located in the intake air by-pass of the housing) detects the intake air temperature.
There is little variation in the output from the intake mass air flow meter assembly, as it is hardly affected by the resistance of the wire harness.
The internal circuit of the intake mass air flow meter assembly contains a hot wire and cold wire. A voltage is output through a bridge circuit (refer to the illustration) indicating the cooling of the hot wire according to the intake air amount. This voltage is then converted into a periodic signal by the periodic signal conversion circuit and output to the ECM. The frequency varies between approximately 1945 and 8500 Hz depending on the air flow rate. The ECM calculates the mass air flow rate based on this frequency.

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Kd-Ftv Engine Control.Ecd System (For Dpf). Dtc P0100 Mass Air Flow Circuit Malfunction


P0100
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
3 seconds after engine is started
Mass air flow meter signal frequency is less than 850 Hz with the engine speed at 400 rpm or more for 3 seconds (1 trip detection logic).
  1. Open or short in mass air flow meter circuit
  2. Mass air flow meter
  3. ECM

Related Data List
DTC No.
Data List
P0100
MAF
HINT:
  1. If DTC P0100 is stored, the following symptoms may appear (as the ECM mistakenly determines that there is less air than the actual intake air amount, EGR is decreased according to the target EGR):
    1. Combustion noise worsens

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Kd-Ftv Engine Control.Ecd System (For Dpf). Dtc P0100 Mass Air Flow Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
  2. After replacing the ECM, the new ECM needs registration (HILUX_TGN26 RM0000012XK059X.html) and initialization (HILUX_TGN26 RM000000TIN057X.html).
  3. After replacing the fuel supply pump assembly, the ECM needs initialization (HILUX_TGN26 RM000000TIN057X.html).
  4. After replacing an injector assembly, the ECM needs registration (HILUX_TGN26 RM0000012XK059X.html).
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, and other data from the time the malfunction occurred.
1.INSPECT MASS AIR FLOW METER (POWER SOURCE CIRCUIT)
Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Kd-Ftv Engine Control.Ecd System (For Dpf). Dtc P0100 Mass Air Flow Circuit Malfunction

  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
    C115-3 (+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 3
OK


2.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:

    Tester Connection
    		Condition
    		Specified Condition
    C115-5 (FG) - C113-17 (VG)
    		Always
    		Below 1 Ω
    C115-4 (E2G) - C113-18 (EVG)
    		Always
    		Below 1 Ω
    C115-5 (FG) or C113-17 (VG) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the mass air flow meter connector.

  1. Reconnect the ECM connector.



OK
Go to step 6

NG
Go to step 4

3.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - NO. 1 INTEGRATION RELAY)

  1. Disconnect the mass air flow meter connector.

  1. Remove the No. 1 integration relay from the engine room relay block and junction block assembly.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C115-3 (+B) - 1J-5
    		Always
    		Below 1 Ω
    C115-3 (+B) or 1J-5 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the mass air flow meter connector.

  1. Reinstall the No. 1 integration relay.



OK
Go to step 5

NG
Go to step 4

4.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.



NEXT
Go to step 9

5.CHECK ECM POWER SOURCE CIRCUIT

  1. Check the ECM power source circuit (HILUX_TGN26 RM000000TI2050X.html).



NEXT
Go to step 9

6.REPLACE MASS AIR FLOW METER

  1. Replace the mass air flow meter (HILUX_TGN26 RM000000VHD04DX.html).


NEXT


7.CHECK WHETHER DTC OUTPUT RECURS

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (HILUX_TGN26 RM000000PDK0X3X.html).

  1. Start the engine and wait for 3 seconds or more.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    P0100 is output
    		A
    No DTC is output
    		B


B
END
A


8.REPLACE ECM

  1. Replace the ECM (HILUX_TGN26 RM0000013Z001HX.html).


NEXT


9.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (HILUX_TGN26 RM000000PDK0X3X.html).

  1. Start the engine and wait for 3 seconds or more.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Confirm that the DTC is not output again.


NEXT

END