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

READ VALUE USING INTAKE AIR TEMPERATURE SENSOR (INTAKE AIR)

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

Read the value displayed on the tester.

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).

B → See step 4

C → CHECK FOR INTERMITTENT PROBLEMS

A: Go to next step

CHECK INTAKE AIR TEMPERATURE SENSOR (CHECK FOR OPEN IN SENSOR)
1. Confirm good connection of Mass Air Flow (MAF) meter.
  
  Fig 1: E29 MAF Meter Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E29 MAF meter connector.
3. Connect terminals THA and E2 of the MAF meter wire harness side connector.
4. Connect Techstream to the DLC3.
5. Turn the engine switch on (IG).
6. Turn the tester on.
7. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
8. Read the value displayed on the tester.
  Standard
  
  140°C (284°F)
9. Reconnect the MAF meter connector.
OK → REPLACE MASS AIR FLOW METER

NG: Go to next step
CHECK ECM (CHECK FOR OPEN IN ECM)
1. Confirm good connection of the ECM.
  
  Fig 2: Identifying Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E29 MAF meter connector.
3. Connect terminals THA and ETHA of the E5 ECM connector.
  HINT:
  
  Before checking, do visual and contact pressure checks on the ECM connector.
4. Connect Techstream to the DLC3.
5. Turn the engine switch on (IG).
6. Turn the tester on.
7. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
8. Read the value displayed on the tester.
  Standard
  
  140°C (284°F)
9. Reconnect the MAF meter connector.
OK → REPAIR OR REPLACE HARNESS OR CONNECTOR

NG → See step 6
CHECK INTAKE AIR TEMPERATURE SENSOR (CHECK FOR SHORT IN SENSOR)
1. Disconnect the E29 MAF meter connector.
  
  Fig 3: Identifying MAF Meter Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the tester on.
5. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
6. Read the value displayed on the tester.
  Standard
  
  -40°C (-40°F)
7. Reconnect the MAF meter connector.
OK → REPLACE MASS AIR FLOW METER

NG: Go to next step
CHECK ECM (CHECK FOR SHORT IN ECM)
1. Disconnect the E5 ECM connector.
  
  Fig 4: Identifying E5 ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the tester on.
5. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
6. Read the value displayed on the tester.
  Standard
  
  -40°C (-40°F)
7. Reconnect the ECM connector.
OK → REPAIR OR REPLACE HARNESS OR CONNECTOR

NG → See step 7
REPLACE ECM. Refer to REMOVAL
REPLACE ECM. Refer to REMOVAL