DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input: Procedure

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 / Intake Air.
5. Read the value displayed on the Techstream.

   OK

   Same as actual intake air temperature.

   Result

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

   HINT: 

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

C → See step   4 

B → See step   7 

A: Go to next step 

1. Disconnect the mass air flow meter connector.
   Fig 1: Identifying (THA) And (E2) Of Mass Air Flow Meter Wire Harness Side Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect terminals 1 (THA) and 2 (E2) of the mass air flow meter wire harness side connector.
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch to ON.
5. Turn the Techstream on.
6. Enter the following menus: Powertrain / Engine and ECT / Intake Air.
7. Read the value displayed on the Techstream.

   Standard value

   140°C (284°F) or higher

8. Reconnect the mass air flow meter connector.

NG → See step   3 

OK → See step   5 

1. Disconnect the mass air flow meter connector.
   Fig 2: Identifying Mass Air Flow Meter Connector And ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B2-1 (THA) - B29-65 (THA)	Always	Below 1 Ω
   B2-2 (E2) - B29-88 (ETHA)	Always	Below 1 Ω

4. Reconnect the mass air flow meter connector.
5. Reconnect the ECM connector.

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

OK → See step   6 

1. Disconnect the mass air flow meter connector.
   Fig 3: Checking For Short In Wire Harness

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. Turn the Techstream on.
5. Enter the following menus: Powertrain / Engine and ECT / Intake Air.
6. Read the value displayed on the Techstream.

   Standard value

   -40°C (-40°F)

7. Reconnect the mass air flow meter connector.

NG → See step   8 

OK → See step   9 

1. Disconnect the mass air flow meter connector.
   Fig 4: Identifying Mass Air Flow Meter And ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B2-1 (THA) or B29-65 (THA) - Body ground	Always	10 kΩ or higher

4. Reconnect the mass air flow meter connector.
5. Reconnect the ECM connector.

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

OK → See step   10