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 / Data List / 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
   Higher than 128°C (262°F)	B
   Same as actual IAT	C

   HINT: 

   • If there is an open circuit, the Techstream indicates -40°C (-40°F).
   • If there is a short circuit, the Techstream indicates higher than 128°C (262°F).

B → See step   4 

C → See step   6 

A: Go to next step 

Fig 1: Identifying Mass Air Flow Meter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the mass air flow meter connector.
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 / Data List / Intake Air.
7. Read the value displayed on the Techstream.

   Standard value

   Higher than 128°C (262°F)

   TEXT IN ILLUSTRATION
   
   

   *1	Mass Air Flow Meter
   *2	ECM
   *a	Front view of wire harness connector (to Mass Air Flow Meter)

NG → See step   3 

OK → See step   7 

1. Disconnect the C23 mass air flow meter connector.
2. Disconnect the C19 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C23-1 (THA) - C19-87 (THA)	Always	Below 1 Ω
   C23-2 (E2) - C19-88 (ETHA)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8 

Fig 2: Identifying Air Flow Meter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the C23 mass air flow meter connector.
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 / Data List / Intake Air.
6. Read the value displayed on the Techstream.

   Standard value

   -40°C (-40°F)

   TEXT IN ILLUSTRATION
   
   

   *1	Mass Air Flow Meter
   *2	ECM

NG → See step   5 

OK → See step   9 

1. Disconnect the C23 mass air flow meter connector.
2. Disconnect the C19 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C23-1 (THA) or C19-87 (THA) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10