СИСТЕМА ECD, Diagnostic DTC:P0110, P0112, P0113

DTC Code	DTC Name
P0110	Intake Air Temperature Circuit
P0112	Intake Air Temperature Circuit Low Input
P0113	Intake Air Temperature Circuit High Input

DESCRIPTION


*1	(Fig. 1)
*2	Resistance kΩ
*3	Acceptable
*4	Temperature °C (°F)

The Intake Air Temperature (IAT) sensor, mounted on the air cleaner hose, monitors the IAT. The IAT sensor has a thermistor that varies its resistance depending on the temperature of the intake air. When the air temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance decreases. The variations in resistance are communicated to the ECM as changes in voltage (see Fig. 1).

The IAT sensor is connected to the ECM (see below). The 5 V power source voltage in the ECM is applied to the IAT sensor from terminal THA via resistor R.

The resistor R and the IAT sensor are connected in series. When the resistance value of the IAT sensor changes in accordance with changes in the IAT, the voltage at terminal THA also changes. Based on this signal, the ECM increases the fuel injection volume to improve the driveability during cold engine operation.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0110	Intake Air Temperature Circuit	Open or short in IAT sensor circuit for 0.5 seconds (1 trip detection logic)	Open or short in IAT sensor circuit IAT sensor ECM	-	DTC stored
P0112	Intake Air Temperature Circuit Low Input	Short in IAT sensor circuit for 0.5 seconds (1 trip detection logic)	Open or short in IAT sensor circuit IAT sensor ECM	-	DTC stored
P0113	Intake Air Temperature Circuit High Input	Short in IAT sensor circuit for 0.5 seconds (1 trip detection logic)	Open or short in IAT sensor circuit IAT sensor ECM	-	DTC stored

Tech Tips

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

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

CONFIRMATION DRIVING PATTERN

P0110, P0112, P0113
DTC Detection Drive Pattern	Ignition switch to ON for 0.5 seconds

WIRING DIAGRAM


*a	Intake Air Temperature Sensor

CAUTION / NOTICE / HINT

Note

After replacing the ECM, the new ECM needs registration (See page ) and initialization Click here.

Tech Tips

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, and other data from the time the malfunction occurred.

PROCEDURE

READ VALUE USING GTS (INTAKE AIR TEMPERATURE)

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Intake Air.

Powertrain > Engine > Data List

Tester Display

Intake Air

Tester Display
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

Tech Tips

If there is an open circuit, the GTS indicates -40°C (-40°F).
If there is a short circuit, the GTS indicates 140°C (284°F) or higher.

READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS) Click here

GO TO STEP 8 Click here

READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)

Intake Air Temperature Sensor

ECM

Front view of wire harness connector

(to Intake Air Temperature Sensor)

Disconnect the A54 intake air temperature sensor connector.

Connect terminals 1 and 2 of the intake air temperature sensor wire harness side connector.
Connect the GTS to the DLC3.
Turn the ignition switch ON and turn the GTS ON.
Enter the following menus: Powertrain / Engine / Data List / Intake Air.

Powertrain > Engine > Data List

Tester Display

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

OK

140°C (284°F) or more

Tester Display
Intake Air

OK
140°C (284°F) or more

Reconnect the intake air temperature sensor connector.

Result

Proceed to
OK
NG

CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM) Click here

CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE INTAKE AIR TEMPERATURE SENSOR

Replace the intake air temperature sensor (w/o mass air flow meter).

Click here

Result

Proceed to
NEXT

GO TO STEP 8 Click here

CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM)

Disconnect the intake air temperature sensor connector.
Disconnect the ECM connector.

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

Standard resistance

Tester Connection	Condition	Specified Condition
A54-2(THA) - A55-31 (THA)	Always	Below 1 Ω
A54-1(E2) - A55-28 (E2)	Always	Below 1 Ω

Reconnect the intake air temperature sensor connector.

Reconnect the ECM connector.

Result

Proceed to
OK
NG

GO TO STEP 11 Click here

CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM.

Replace the ECM.

Click here

Result

Proceed to
NEXT

GO TO STEP 8 Click here

READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)

*1 Intake Air Temperature Sensor

*2 ECM

Disconnect the intake air temperature sensor connector.
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Intake Air.

Powertrain > Engine > Data List

Tester Display

Intake Air
Read the value.

OK

-40°C (-40°F)

Tester Display
Intake Air

OK
-40°C (-40°F)

Reconnect the intake air temperature sensor connector.

Result

Proceed to
OK
NG

CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM) Click here

REPLACE INTAKE AIR TEMPERATURE SENSOR

Replace the intake air temperature sensor.

Click here

Result

Proceed to
NEXT

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the GTS to the DLC3.
Clear the DTCs.

Powertrain > Engine > Clear DTCs
Turn the ignition switch to ON for 1 second.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

Confirm that the DTC is not output again.

Result

Proceed to
NEXT

END

CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM)

Disconnect the intake air temperature sensor connector.
Disconnect the ECM connector.

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

Standerd resistance

Tester Connection	Condition	Specified Condition
A54-1 or C55-31 (THA) - Body ground	Always	10 kΩ or higher

Reconnect the intake air temperature sensor connector.

Reconnect the ECM connector.

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

REPLACE ECM

Replace the ECM.

Click here

Result

Proceed to
NEXT

GO TO STEP 8 Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

Repair or replace the harness or connector.

Result

Proceed to
NEXT

GO TO STEP 8 Click here