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 engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
5. Read the value displayed on the Techstream.

   Standard

   Same as actual intake air temperature.

   Result

   Result	Proceed to
   Displayed temperature is -40°C (-40°F)	A
   Displayed temperature is 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.

B → See step   4 

C → See step   6 

A: Go to next step 

1. Confirm good connection at the mass air flow meter.
   Fig 1: Checking For Open In Wire Harness (Mass Air Flow Meter)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

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

2. Disconnect the mass air flow meter connector.
3. Connect terminals THA and E2 of the mass air flow meter connector on the wire harness side.
4. Connect the Techstream to the DLC3.
5. Turn the engine switch on (IG).
6. Turn the Techstream on.
7. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
8. Read the value displayed on the Techstream.

   Standard

   140°C (284°F) or higher

9. Reconnect the mass air flow meter connector.

NG → See step   3 

OK → See step   7 

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
   E29-1 (THA) - E5-25 (THA)	Always	Below 1 Ω
   E29-2 (E2) - E5-30 (E3)	Always	Below 1 Ω

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Mass Air Flow Meter
   *2	ECM

2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
6. Read the value displayed on the Techstream.

   Standard

   -40°C (-40°F)

7. Reconnect the mass air flow meter connector.

NG → See step   5 

OK → See step   7 

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
   E29-1 (THA) or E5-25 (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 

OK → See step   8