DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input (TO 12/2010): Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Data List / All Data / Intake Air.
5. Read the value displayed on the Techstream.

   Standard

   Same as actual Intake Air Temperature (IAT).

   Result

   Result	Proceed to
   -40°C (-40°F)	A
   140°C (284°F)	B
   Same as actual IAT	C

   HINT: 

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

B → See step   5 

C → See step   7 

A: Go to next step 

1. Confirm good connection of the Mass Air Flow (MAF) meter.
   Fig 1: Identifying MAF Meter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the MAF meter connector.
3. Connect terminals THA and E2 of the MAF meter wire harness side connector.
4. Connect Techstream to the DLC3.
5. Turn the ignition switch to ON.
6. Turn the Techstream on.
7. Enter the following menus: Powertrain / Engine / Data List / All Data / Intake Air.
8. Read the value displayed on the Techstream.

   Standard

   140°C (284°F).

9. Reconnect the MAF meter connector.

OK → REPLACE MASS AIR FLOW METER 

NG: Go to next step 

1. Disconnect the MAF meter connector.
2. Disconnect the ECM connector.
3. Measure the resistance between the terminals.

   Standard resistance (Check for open)

   Tester Connection	Condition	Specified Condition
   B50-71 (THA) - B10-1 (THA)	Always	Below 1 Ω
   B50-74 (ETHA) - B10-2 (E2)	Always	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Condition	Specified Condition
   B50-71 (THA) or B10-1 (THA) - Body ground	Always	10 kΩ or higher
   B50-74 (ETHA) or B10-2 (E2) - Body ground	Always	10 kΩ or higher

4. Reconnect the MAF meter connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4 

1. Disconnect the MAF meter connector.
   Fig 2: Mass Air Flow Meter Circuit Diagram

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

   Standard

   -40°C (-40°F).

7. Reconnect the MAF meter connector.

OK → REPLACE MASS AIR FLOW METER 

NG: Go to next step 

1. Disconnect the MAF meter connector.
2. Disconnect the ECM connector.
3. Measure the resistance between the terminals.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   B50-71 (THA) or B10-1 (THA) - Body ground	Always	10 kΩ or higher

4. Reconnect the MAF meter connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4