DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input (From 08/2009): Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
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.

   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)	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).

C → See step   6 

B → See step   4 

A: Go to next step 

1. Confirm good connection at the mass air flow meter sub-assembly.
   Fig 1: Identifying Mass Air Flow Meter Sub-assembly, ECM & Mass Air Flow Meter Sub-Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

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

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

   Standard

   140°C (284°F)

9. Reconnect the mass air flow meter sub-assembly connector.

NG → See step   3 

OK → See step   7 

1. Disconnect the mass air flow meter sub-assembly connector.
   Fig 2: Checking Harness And Connector (Mass Air Flow Meter Sub-Assembly - ECM) 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 (Check for Open)

   Tester Connection	Condition	Specified Condition
   D3-1 (THA) - D1-96 (THA)	Always	Below 1 Ω
   D3-2 (E2) - D1-128 (ETHA)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1

   Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly)

   *2

   Front view of wire harness connector (to ECM)

4. Reconnect the mass air flow meter sub-assembly connector.
5. Reconnect the ECM connector.

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

OK → See step   8 

1. Disconnect the mass air flow meter sub-assembly connector.
   Fig 3: Identifying Mass Air Flow Meter Sub-Assembly & ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Mass Air Flow Meter Sub-assembly
   *2	ECM

2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG).
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

   -40°C (-40°F)

7. Reconnect the mass air flow meter sub-assembly connector.

NG → See step   5 

OK → See step   7 

1. Disconnect the mass air flow meter sub-assembly connector.
   Fig 4: Checking Harness And Connector (Mass Air Flow Meter Sub-Assembly - ECM) 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 (Check for Short)

   Tester Connection	Condition	Specified Condition
   D3-1 (THA) or D1-96 (THA) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1

   Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly)

   *2

   Front view of wire harness connector (to ECM)

4. Reconnect the mass air flow meter sub-assembly connector.
5. Reconnect the ECM connector.

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

OK → See step   8