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Nissan Sentra B18 (2020-2025) Service Manual: P0112 Iat Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0112

IAT SEN/CIRCUIT-B1

(Intake air temperature sensor 1 circuit low bank 1)

Diagnosis condition

Ignition switch ON

Signal (terminal)

Intake air temperature sensor signal

Threshold

An excessively low voltage from the sensor is sent to ECM

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness or connectors (The intake air temperature sensor circuit is open or shorted.)

  • Intake air temperature sensor

FAIL-SAFE

Engine Control System

Not applicable

Idle Start/Stop System

When a DTC is detected, the start/stop indicator lamp blinks slowly and the idle start/stop system operation is prohibited.

When ECM detects error while operating the idle start/stop system, ECM restarts the engine.

Confirmation Procedure

Confirmation Procedure

  1. PRECONDITIONING

    If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

    >>

    GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE

    1. Turn ignition switch ON and wait at least 5 seconds.

    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES >>

    Proceed to DTC Diagnosis Procedure.

    NO-1 >>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    NO-2 >>

    Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK INTAKE AIR TEMPERATURE (IAT) SENSOR POWER SUPPLY-1

    1. Turn ignition switch OFF.

    2. Disconnect mass air flow (MAF) sensor (intake air temperature sensor is built-in) harness connector.

    3. Turn ignition switch ON.

    4. Check the voltage between MAF sensor harness connector terminals.

      MAF sensor

      Voltage

      (Approx.)

      Connector

      Terminal

      F31

      1

      3

      5 V

    Is the inspection result normal?

    YES >>

    GO TO 6.

    NO >>

    GO TO 2.

  2. CHECK IAT SENSOR POWER SUPPLY-2

    Check the voltage between MAF sensor harness connector and ground.

    +

    −

    Voltage

    (Approx.)

    MAF sensor

    Connector

    Terminal

    F31

    1

    Ground

    5 V

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    GO TO 3.

  3. CHECK IAT SENSOR POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between MAF sensor harness connector and ECM harness connector.

      MAF sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F31

      1

      F24

      27

      Existed

    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES >>

    Perform trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure.

    NO >>

    Repair or replace malfunctioning part.

  4. CHECK IAT SENSOR GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between MAF sensor harness connector and ECM harness connector.

      MAF sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F31

      3

      F24

      23

      Existed

    4. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    Repair or replace malfunctioning part.

  5. CHECK ECM GROUND CIRCUIT

    1. Check the continuity between ECM harness connector and ground.

      ECM

      —

      Continuity

      Connector

      Terminal

      F24

      5

      Ground

      Existed

      65

      F25

      69

      E16

      157

      159

      162

    2. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Repair or replace malfunctioning part.

  6. CHECK INTAKE AIR TEMPERATURE SENSOR

    Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace mass air flow (MAF) sensor (intake air temperature sensor is built-in). Refer to Exploded View.

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