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) 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 a good connection at the mass air flow meter sub-assembly.
   Fig 1: Identifying Mass Air Flow Meter Sub-Assembly, Hybrid Vehicle Control ECU & Mass Air Flow Meter Sub-Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Mass Air Flow Meter Sub-assembly	*2	Hybrid Vehicle Control ECU
   *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 Value

   140°C (284°F) or higher

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.
2. Disconnect the hybrid vehicle control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   C1-1 (THA) - C28-59 (THA)	Always	Below 1 Ω
   C1-2 (E2) - C28-45 (ETHA)	Always	Below 1 Ω

4. Reconnect the mass air flow meter sub-assembly connector.
5. Reconnect the hybrid vehicle control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Mass Air Flow Meter Sub-assembly
   *2	Hybrid Vehicle Control ECU

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   5 

OK → See step   9 

1. Disconnect the mass air flow meter sub-assembly connector.
2. Disconnect the hybrid vehicle control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   C1-1 (THA) or C28-59 (THA) - Body ground	Always	10 kΩ or higher

4. Reconnect the mass air flow meter sub-assembly connector.
5. Reconnect the hybrid vehicle control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10