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DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input: Procedure

READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.

Read the value displayed on the Techstream.

OK

Same as actual intake air temperature.

Result

Result	Proceed to
-40°C (-40°F)	A
More than 128°C (262°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 more than 128°C (262°F).

B → See step 7

C → See step 4

A: Go to next step

READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)

Fig 1: Identifying Mass Air Flow Meter Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the mass air flow meter connector.
2. Connect terminals 1 (THA) and 2 (E2) of the mass air flow meter wire harness side connector.
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch to ON.
5. Turn the Techstream on.
6. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.
7. Read the value displayed on the Techstream.
  Standard Value
  
  More than 128°C (262°F)
8. Reconnect the mass air flow meter connector.
NG → See step 3

OK → See step 5

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

Disconnect the mass air flow meter connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
B2-1 (THA) - B29-65 (THA)	Always	Below 1 Ω
B2-2 (E2) - B29-88 (ETHA)	Always	Below 1 Ω

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

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

OK → See step 6

CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
REPLACE MASS AIR FLOW METER. Refer to COMPONENTS
REPLACE ECM. Refer to COMPONENTS
READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)

Fig 2: Checking For Short In Wire Harness
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the mass air flow meter connector.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
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 Value
  
  -40°C (-40°F)
7. Reconnect the mass air flow meter connector.
NG → See step 8

OK → See step 9

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

Disconnect the mass air flow meter connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
B2-1 (THA) or B29-65 (THA) - Body ground	Always	10 kΩ or higher

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

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

OK → See step 10

REPLACE MASS AIR FLOW METER. Refer to REMOVAL
REPLACE ECM. Refer to REMOVAL