The lower the intake air temperature, the greater the thermistor resistance value. The higher the intake air temperature, the lower the thermistor resistance value (See Fig. 1).

The intake air temperature sensor is connected to the ECM.

The 5 V power source voltage in the ECM is applied to the intake air temperature sensor from terminal THA via resistor R.

Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes in accordance with changes in the intake air temperature, the potential at terminal THA also changes. Based on this signal, the ECM increases the fuel injection volume to improve driveability with a cold engine.

Dtc P0110 Intake Air Temperature Circuit. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

P0110
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 0.5 seconds	Open or short in the intake air temperature (IAT) sensor for 0.5 seconds (1 trip detection logic).	Open or short in intake air temperature (IAT) sensor circuit IAT sensor (built into mass air flow meter) ECM

P0112
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 0.5 seconds	Short in the IAT sensor for 0.5 seconds (1 trip detection logic).	Short in IAT sensor circuit IAT sensor (built into mass air flow meter) ECM

P0113
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 0.5 seconds	Open in the IAT sensor for 0.5 seconds (1 trip detection logic).	Open in IAT sensor circuit IAT sensor (built into mass air flow meter) ECM

Related Data List
DTC No.	Data List
P0110	Intake Air
P0112
P0113

HINT:

If DTC P0110, P0112 and/or P0113 is stored, the following symptoms may appear:

Misfire

Combustion noise

Black smoke

White smoke

Lack of power

When DTC P0110, P0112 or P0113 is stored, check the intake air temperature by entering the following menus: Powertrain / Engine / Data List / Intake Air.

Reference
Temperature Displayed	Malfunction
-40°C (-40°F)	Open circuit
140°C (284°F) or higher	Short circuit

WIRING DIAGRAM

Dtc P0110 Intake Air Temperature Circuit. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

NOTICE:

After replacing the ECM, the new ECM needs registration () and initialization ().

HINT:

If DTCs relating to different systems are stored, and they share terminal E2 as their ground, check this ground circuit first.

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.READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMPERATURE)

Connect the intelligent tester to the DLC3.

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

Enter the following menus: Powertrain / Engine / Data List / Intake Air.

Read the value.

OK:
Same as actual intake air temperature.

Result
Result	Proceed to
-40°C (-40°F)	A
140°C (284°F) or higher	B
OK (same as actual intake air temperature)	C

HINT:

If there is an open circuit, the tester indicates -40°C (-40°F).

If there is a short circuit, the tester indicates 140°C (284°F) or more.

Go to step 4

Go to step 11

A

2.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)

Disconnect the mass air flow meter connector.

Connect terminals 4 (THA) and 5 (E2) of the mass air flow meter wire harness side connector.

Connect the intelligent tester to the DLC3.

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

Enter the following menus: Powertrain / Engine / Data List / Intake Air.

Read the value.

OK:
140°C (284°F) or higher

Go to step 7

Go to step 3

3.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 (Check for Open):
for LHD
Tester Connection Condition Specified Condition
C50-4 (THA) - C45-71 (THA) Always Below 1 Ω
C50-5 (E2) - C45-75 (E2) Always Below 1 Ω
for RHD
Tester Connection Condition Specified Condition
C50-4 (THA) - C46-71 (THA) Always Below 1 Ω
C50-5 (E2) - C46-75 (E2) Always Below 1 Ω

for LHD
Tester Connection	Condition	Specified Condition
C50-4 (THA) - C45-71 (THA)	Always	Below 1 Ω
C50-5 (E2) - C45-75 (E2)	Always	Below 1 Ω

for RHD
Tester Connection	Condition	Specified Condition
C50-4 (THA) - C46-71 (THA)	Always	Below 1 Ω
C50-5 (E2) - C46-75 (E2)	Always	Below 1 Ω

Go to step 9

Go to step 8

4.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)

Disconnect the mass air flow meter connector.

Connect the intelligent tester to the DLC3.

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

Enter the following menus: Powertrain / Engine / Data List / Intake Air.

Read the value.

OK:
-40°C (-40°F)

Go to step 10

Go to step 5

5.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 (Check for Short):
for LHD
Tester Connection Condition Specified Condition
C50-4 (THA) or C45-71 (THA) - Body ground Always 10 kΩ or higher
for RHD
Tester Connection Condition Specified Condition
C50-4 (THA) or C46-71 (THA) - Body ground Always 10 kΩ or higher