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DTC P0110: Intake Air Temperature Circuit Malfunction; DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input: Procedure

CHECK DTC OUTPUT

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Select the following menu items: Powertrain / Engine / Trouble Code.

Read the DTCs.

Result

Display (DTC output)	Proceed to
P0110	A
P0112	B
P0113	C

C → See step 4

B → See step 7

A: Go to next step

READ VALUE USING INTAKE AIR TEMPERATURE SENSOR (INTAKE AIR)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Data List / Intake Air.

Read the value displayed on the Techstream.

Standard

Same as actual Intake Air Temperature (IAT).

Result

Temperature Displayed	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).

C → See step 8

B → See step 6

A: Go to next step

CHECK MASS AIR FLOW METER (CHECK FOR OPEN IN SENSOR)
1. Confirm good connection of the Mass Air Flow (MAF) meter.
  
  Fig 1: Identifying B33 MAF Meter Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the B33 MAF meter connector.
3. Connect terminals THA and E2 of the MAF meter wire harness side connector.
4. Connect the Techstream to the DLC3.
5. Turn the engine switch on (IG).
6. Turn the Techstream on.
7. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
8. Read the value displayed on the Techstream.
  Standard
  
  140°C (284°F)
9. Reconnect the MAF meter connector.
OK → See step 9

NG: Go to next step

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

Disconnect the B33 MAF meter connector.

Fig 2: Identifying B12 ECM Connector Terminal & B33 MAF Meter Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the B12 ECM connector.

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

Standard resistance (Check for open)

Tester Connection	Specified Condition
THA (B12-71) - THA (B33-1)	Below 1 Ω
ETHA (B12-74) - E2 (B33-2)	Below 1 Ω

Reconnect the MAF meter connector.
Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 5

REPLACE ECM. Refer to REMOVAL
CHECK MASS AIR FLOW METER (CHECK FOR SHORT IN SENSOR)
1. Disconnect the B33 MAF meter connector.
  
  Fig 3: Identifying B33 MAF Meter Connector Circuit Diagram
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
6. Read the value displayed on the Techstream.
  Standard
  
  -40°C (-40°F)
7. Reconnect the MAF meter connector.
OK → See step 10

NG: Go to next step

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

Disconnect the B33 MAF meter connector.

Fig 4: Identifying B33 MAF Meter Connector Terminal & B12 ECM Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the B12 ECM connector.

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

Standard resistance

Tester Connection	Specified Condition
THA (B12-71) or THA (B33-1) - Body ground	10 kΩ or higher

Reconnect the MAF meter connector.
Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 5

CHECK FOR INTERMITTENT PROBLEMS. Refer to PROBLEM SYMPTOMS TABLE
REPLACE MASS AIR FLOW METER. Refer to REMOVAL
REPLACE MASS AIR FLOW METER. Refer to REMOVAL