Dtc Description

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (High or low resistance in the IAT sensor circuit)

• Intake air temperature sensor

FAIL-SAFE

Not applicable

Confirmation Procedure

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

   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.

   With CONSULT

   1. Turn ignition switch OFF.

   2. Disconnect mass air flow sensor harness connector and reconnect it again.

   3. Turn ignition switch ON.

   4. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

   5. Check that “INT/A TEMP SEN” indicates as per following condition.

      Monitor item	Condition		Value
      INT/A TEMP SEN	Temperature [°C (°F)]	25 (77)	1.9 – 2.1 V

   Is the inspection result normal?

   YES-1 >>

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

   YES-2 >>

   Confirmation after repair: INSPECTION END

   NO >>

   Proceed to DTC Diagnosis Procedure.

3. 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.

   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. Move the Nissan Sentra vehicle to a cool place.

      Note:

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

   2. Turn ignition switch OFF and leave the Nissan Sentra vehicle for 12 hours.

      CAUTION:

      Never turn ignition switch ON during this procedure.

      Note:

      The Nissan Sentra vehicle must be cooled with the hood open.

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

      CAUTION:

      Never turn ignition switch OFF during idling.

   4. 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

   Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

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