Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » P0111 IAT sensor
DTC Logic

DTC DETECTION LOGIC

DTC No. Trouble diagnosis name (Trouble diagnosis content) DTC detecting condition Possible cause
P0111 IAT SENSOR 1 B1 [Intake air temperature (IAT) sensor circuit range/performance] The comparison result of signals transmitted to ECM from each temperature sensor (IAT sensor, ECT sensor, FTT sensor, and EOT sensor) shows that the voltage signal of the IAT sensor is higher/lower than that of other temperature sensors when the engine is started with its cold state.
  • Harness or connectors (High or low resistance in the IAT sensor circuit)
  • IAT sensor

DTC CONFIRMATION PROCEDURE

1.INSPECTION START

Is it necessary to erase permanent DTC?

YES >> GO TO 3.

NO >> GO TO 2.

2.PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to EC, "Component Function Check".

NOTE: Use the component function check to check the overall function of the IAT sensor circuit. During this check, a 1st trip DTC might not be confirmed.

Is the inspection result normal?

YES >> INSPECTION END

NO >> Proceed to EC, "Diagnosis Procedure".

3.PRECONDITIONING

If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following procedure before conducting the next test.

  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

  • Before performing the following procedure, do not add fuel.
  • Before performing the following procedure, check that fuel level is between 1/4 and 4/4.
  • Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

>> GO TO 4.

4.PERFORM DTC CONFIRMATION PROCEDURE

  1. Start engine and let it idle for 60 minutes.
  2. Move the vehicle to a cool place.

    NOTE: Cool the vehicle in an environment of ambient air temperature between −10C (14F) and 35C (95F).

  3. Turn ignition switch OFF and soak the vehicle for 12 hours.

    CAUTION: Never turn ignition switch ON during soaking.

    NOTE: The vehicle must be cooled with the food open.

  4. Start engine and let it idle for 5 minutes or more.

    CAUTION: Never turn ignition switch OFF during idling.

  5. Check 1st trip DTC.

Is 1st trip DTC detected?

YES >> Proceed to EC, "Diagnosis Procedure".

NO >> INSPECTION END

    More about «P0111 IAT sensor»:

    DTC Logic

    Component Function Check

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