1Kd-Ftv Engine Control. Dtc P0100 Mass Air Flow Circuit Malfunction

The mass air flow 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 works on the principle that the hot wire and temperature sensor located in the intake air by-pass of the housing detect any 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 related 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.

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-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 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 meter circuit Mass air flow meter ECM

P0102
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
3 seconds after engine is started	Mass air flow 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 or short in mass air flow meter circuit Mass air flow meter ECM

P0103
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
3 seconds after engine is started	Mass air flow meter voltage is 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 meter circuit Mass air flow meter ECM

Related Data List
DTC No.	Data List
P0100	MAF
P0102
P0103

HINT:

If DTC P0102 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):

Combustion noise worsens

If DTC P0103 is stored, the following symptoms may appear (as the ECM mistakenly determines that there is more air than the actual intake air amount, EGR is increased according to the target EGR):

Misfire
White smoke
Black smoke

After confirming DTC P0100, P0102 or P0103, check the mass air flow ratio in the following menus: Powertrain / Engine and ECT / Data List / MAF using the intelligent tester.
Reference
Air Flow Value (gm/s)
Malfunction
Approximately 0.0
Open in mass air flow meter power source circuit
Open or short in VG circuit
167.5 or more
Open in EVG circuit

Reference
Air Flow Value (gm/s)	Malfunction
Approximately 0.0	Open in mass air flow meter power source circuit Open or short in VG circuit
167.5 or more	Open in EVG circuit

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses of circuits related to this system before performing the following inspection procedure.
After replacing the ECM, the new ECM needs registration (HILUX_TGN26 RM0000012XK042X.html) and initialization (HILUX_TGN26 RM000000TIN04EX.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)

Disconnect the mass air flow meter connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
C36-1 - Body ground
Ignition switch ON
11 to 14 V
Text in Illustration
*a
Front view of wire harness connector
(to Mass Air Flow Meter)

Text in Illustration
*a	Front view of wire harness connector (to Mass Air Flow Meter)

Reconnect the mass air flow meter connector.

Go to step 3

OK

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

Disconnect the mass air flow meter connector.

Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection
Condition
Specified Condition
C36-3 - C23-24 (VG)
Always
Below 1 Ω
C36-2 - C23-32 (EVG)
Always
Below 1 Ω
C36-3 or C23-24 (VG) - Body ground
Always
10 kΩ or higher

Reconnect the mass air flow meter connector.

Reconnect the ECM connector.

Go to step 6

Go to step 4

3.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY)

Disconnect the mass air flow meter connector.

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

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

Standard Resistance:

Tester Connection
Condition
Specified Condition
C36-1 - 1J-5
Always
Below 1 Ω
C36-1 or 1J-5 - Body ground
Always
10 kΩ or higher

Reconnect the mass air flow meter connector.

Reinstall the No. 1 integration relay.

Go to step 5

Go to step 4

4.REPAIR OR REPLACE HARNESS OR CONNECTOR

Repair or replace the harness or connector.

Go to step 9

5.CHECK ECM POWER SOURCE CIRCUIT

Check the ECM power source circuit (HILUX_TGN26 RM000000TI203VX.html).

Go to step 9

6.REPLACE MASS AIR FLOW METER

Replace the mass air flow meter (HILUX_TGN26 RM000000VHD042X.html).

NEXT

7.CHECK WHETHER DTC OUTPUT RECURS (DTC P0100, P0102 AND/OR P0103)

Connect the intelligent tester to the DLC3.

Clear the DTCs (HILUX_TGN26 RM000000PDK0T9X.html).

Start the engine and wait for 3 seconds or more.

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

Read the DTCs.
Result
Result
Proceed to
P0100, P0102 and/or P0103 is output
A
No DTC is output
B

Result
Result	Proceed to
P0100, P0102 and/or P0103 is output	A
No DTC is output	B

END

A

8.REPLACE ECM

Replace the ECM (HILUX_TGN26 RM0000013Z0019X.html).

NEXT

9.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the intelligent tester to the DLC3.

Clear the DTCs (HILUX_TGN26 RM000000PDK0T9X.html).

Start the engine and wait for 3 seconds or more.

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

Confirm that the DTC is not output again.

END

Tester Connection	Switch Condition	Specified Condition
C36-1 - Body ground	Ignition switch ON	11 to 14 V

Tester Connection	Condition	Specified Condition
C36-3 - C23-24 (VG)	Always	Below 1 Ω
C36-2 - C23-32 (EVG)	Always	Below 1 Ω
C36-3 or C23-24 (VG) - Body ground	Always	10 kΩ or higher