Code No. P0112: Intake Air Temperature Sensor Circuit Low Input




OPERATION




FUNCTION




TROUBLE JUDGEMENT


Check Conditions
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III data list



  • Item 5: Intake air temperature sensor
OK: At ambient temperature (atmospheric temperature) or equivalent.

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2.

STEP 2. Check intake air temperature sensor itself.



  • Air flow sensor connector check.
  • Intake air temperature sensor check (Refer to ).

Q. Is the check result normal?

Go to Step 3.
Repair or replace the connector, or replace the air flow sensor.

STEP 3. Perform voltage measurement at air flow sensor connector.



  • Disconnect connector, and measure at harness side.
  • Power supply mode of electric motor switch: ACC
  • Voltage between terminal engine-ECU ATS line and body earth.
OK: 4.5 - 4.9 V

Q. Is the check result normal?

Go to Step 5.
Go to Step 4.

STEP 4. Check harness between air flow sensor connector terminal and engine-ECU connector terminal ATS.



  • Check power line for short circuit.

Q. Is the check result normal?

Go to Step 5.
Repair or replace the connector, or repair the damaged harness wire.

STEP 5. M.U.T.-III data list



  • Item 5: Intake air temperature sensor
OK: At ambient temperature (atmospheric temperature) or equivalent.

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU.