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 power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / 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
   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   4 

B → See step   7 

A: Go to next step 

1. Confirm good connection at the mass air flow meter sub-assembly.
   Fig 1: Identifying D5 Connector

   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   5 

1. Disconnect the mass air flow meter sub-assembly connector.
   Fig 2: Identifying Air Flow Meter Sub-Assembly And ECM Connector

   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
   D5-1 (THA) - D28-116 (THA)	Always	Below 1 Ω
   D5-2 (E2) - D28-93 (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   6 

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

   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 / Intake Air.
6. Read the value displayed on the Techstream.

   Standard value

   -40°C (-40°F)

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

NG → See step   8 

OK → See step   9 

1. Disconnect the mass air flow meter sub-assembly connector.
   Fig 4: Identifying D5 And D28 Connector

   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
   D5-1 (THA) or D28-116 (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   10