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 on (IG).
3. Turn the Techstream on.
4. Select the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.
5. Read the value displayed on the Techstream.

   Standard

   Same as actual intake air temperature.

   Result

   Temperature Displayed	Proceed to
   -40°C (-40°F)	A
   Higher than 128°C (262°F)	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 higher than 128°C (262°F).

B → See step   4 

C → See step   7 

A: Go to next step 

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

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

   Standard

   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)

8. Reconnect the mass air flow meter connector.

NG → See step   3 

OK → See step   8 

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

   Standard resistance

   Check for open 

   Tester Connection	Condition	Specified Condition
   B50-15 (THA) - B10-1 (THA)	Always	Below 1 Ω
   B50-7 (ETHA) - B10-2 (E2)	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   9 

1. Disconnect the mass air flow meter connector.
   Fig 2: Checking For Short In Wire Harness

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch on (IG).
4. Turn the Techstream on.
5. Select the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.
6. Read the value displayed on the Techstream.

   Standard

   -40°C (-40°F)

   TEXT IN ILLUSTRATION
   
   

   *1	Mass Air Flow Meter
   *2	ECM

7. Reconnect the mass air flow meter connector.

NG → See step   5 

OK → See step   10 

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

   Standard resistance

   Check for Short 

   Tester Connection	Condition	Specified Condition
   B50-15 (THA) or B10-1 (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   6