Dtc Description

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

Air fuel ratio (A/F) sensor 1

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

1. 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.

   >>

   GO TO 2.

2. PERFORM DTC CONFIRMATION PROCEDURE

   1. Start the engine and warm it up to normal operating temperature.

   2. Drive the Nissan Sentra vehicle a 80 km/h (50 MPH), with selecting suitable gear.

      Note:

      Always keep safe driving to the first priority.

   3. Release accelerator pedal completely to decelerate the Nissan Sentra vehicle for more than 10 seconds.

      Note:

      Always keep safe driving to the first priority.

   4. Check 1st trip DTC.

   Is 1st trip DTC detected?

   YES >>

   Refer 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 AIR FUEL RATIO SENSOR 1 POWER SUPPLY

   1. Turn ignition switch OFF.

   2. Disconnect air fuel ratio (A/F) sensor 1 harness connector.

   3. Turn ignition switch ON.

   4. Check the voltage between A/F sensor 1 harness connector and ground.

      +		−	Voltage
      A/F sensor 1
      Connector	Terminal
      F12	4	Ground	Battery voltage

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   GO TO 2.

2. CHECK AIR FUEL RATIO SENSOR 1 POWER SUPPLY CIRCUIT

   1. Turn ignition switch OFF.

   2. Disconnect IPDM E/R harness connector.

   3. Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.

      A/F sensor 1		IPDM E/R		Continuity
      Connector	Terminal	Connector	Terminal
      F12	4	F96	75	Existed

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

   Is the inspection result normal?

   YES >>

   Perform trouble diagnosis for power supply circuit.

   NO >>

   Repair or replace malfunctioning part.

3. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

   1. Turn ignition switch OFF.

   2. Disconnect ECM harness connector.

   3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

      A/F sensor 1		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      F12	1	F25	86	Existed
      	2		88

   4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.

      A/F sensor 1		—	Continuity
      Connector	Terminal
      F12	1	Ground	Not existed
      	2

      ECM		—	Continuity
      Connector	Terminal
      F25	86	Ground	Not existed
      	88

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

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   Repair or replace malfunctioning part.

4. REPLACE A/F SENSOR 1

   Replace malfunctioning A/F sensor 1. Refer to Exploded View.

   >>

   INSPECTION END