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

READ VALUE USING TECHSTREAM (INTAKE AIR)

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

B → See step 4

C → 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 meter.
  
  Fig 1: E29 Mass Air Flow (MAF) Meter Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E29 Mass Air Flow (MAF) meter connector.
3. Connect terminals THA and E3 of the MAF meter wire harness side connector.
4. Connect 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 / All Data / Intake Air.
8. Read the value displayed on the Techstream.
  Standard
  
  140°C (284°F)
9. Reconnect the MAF meter connector.
OK → See step 7

NG: Go to next step
CHECK ECM (CHECK FOR OPEN IN ECM)
1. Confirm good connection of the ECM.
  
  Fig 2: Checking ECM (Check For Open In ECM)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E29 MAF meter connector.
3. Connect terminals THA and E3 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 Techstream on.
7. Enter the following menus: Powertrain / Engine / Data List / All Data / Intake Air.
8. Read the value displayed on the Techstream.
  Standard
  
  140°C (284°F)
9. Reconnect the MAF meter connector.
OK → REPAIR OR REPLACE HARNESS OR CONNECTOR

NG → See step 8
CHECK MASS AIR FLOW METER (CHECK FOR SHORT IN SENSOR)
1. Disconnect the E29 MAF meter connector.
  
  Fig 3: Checking Intake Air Temperature Sensor (Check For Short In Sensor)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect 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 / All Data / Intake Air.
6. Read the value displayed on the Techstream.
  Standard
  
  -40°C (-40°F)
7. Reconnect the MAF meter connector.
OK → See step 9

NG: Go to next step
CHECK ECM (CHECK FOR SHORT IN ECM)
1. Disconnect the E5 ECM connector.
  
  Fig 4: Checking ECM (Check For Short In ECM)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect 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 / All Data / Intake Air.
6. Read the value displayed on the Techstream.
  Standard
  
  -40°C (-40°F)
7. Reconnect the ECM connector.
OK → REPAIR OR REPLACE HARNESS OR CONNECTOR

NG → See step 10
CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
REPLACE MASS AIR FLOW METER. Refer to REMOVAL
REPLACE ECM. Refer to REMOVAL
REPLACE MASS AIR FLOW METER. Refer to REMOVAL
REPLACE ECM. Refer to REMOVAL