Dtc Description

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (EGR volume control valve position sensor circuit is open or shorted)

• EGR volume control valve

FAIL-SAFE

Engine Control System

Engine operating condition in fail-safe mode
Fail safe mode		Nissan Sentra Vehicle behavior
Traveling control mode	Accelerator angle variation control	ECM controls the accelerator pedal depression speed to make it slower than actual speed. This causes a drop in accelerating performance and encourages the driver to repair malfunction. Note: ECM does not control the accelerator pedal releasing speed.
Device fix mode		This mode fixes the electric IVT motor and the EVT control solenoid valve in the reference position. The intake manifold runner control valve motor is turned OFF (intake manifold runner control valve opens).

Idle Start/Stop System

Not applicable

Confirmation Procedure

Confirmation Procedure

1. CHECK DTC PRIORITY

   If DTC P044A is displayed with DTC P0643, first perform the confirmation procedure (trouble diagnosis) forDTC P0643.

   Is DTC P0643 detected?

   YES >>

   Perform diagnosis of applicable. Refer to DTC Description.

   NO >>

   GO TO 2.

2. 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 3.

3. 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 >>

   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 DTC PRIORITY

   If DTC P044A is displayed with DTC P0643, first perform the confirmation procedure (trouble diagnosis) for DTC P0643.

   Is DTC P0643 detected?

   YES >>

   Perform diagnosis of applicable. Refer to DTC Description.

   NO >>

   GO TO 2.

2. CHECK EGR VOLUME CONTROL VALVE POSITION SENSOR POWER SUPPLY

   1. Turn ignition switch OFF.

   2. Disconnect EGR volume control valve harness connector.

   3. Turn ignition switch ON.

   4. Check the voltage between EGR volume control valve harness connector and ground.

      +		−	Voltage (Approx.)
      EGR volume control valve
      Connector	Terminal
      F94	3	Ground	5 V

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   Perform the trouble diagnosis for power supply circuit.

3. CHECK EGR VOLUME CONTROL VALVE POSITION SENSOR GROUND CIRCUIT

   1. Turn ignition switch OFF.

   2. Disconnect ECM harness connector.

   3. Check the continuity between EGR volume control valve harness connector and ECM harness connector.

      EGR volume control valve		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      F94	2	F25	79	Existed

   4. 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. CHECK EGR VOLUME CONTROL VALVE POSITION SENSOR INPUT SIGNAL CIRCUIT

   1. Check the continuity between EGR volume control valve position sensor harness connector and ECM harness connector.

      EGR volume control valve		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      F94	1	F25	78	Existed

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

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Repair or replace malfunctioning part.

5. CHECK EGR VOLUME CONTROL VALVE

   Check EGR volume control valve. Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   Repair or replace error-detected parts.