Nissan Sentra B18 (2020-2025) Service Manual: P0500 Vss

Dtc Description

ECM receives vehicle speed signals from two different paths via CAN communication line: One is from the ABS actuator and electric unit (control unit) via the combination unit and the other is from TCM.

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Combination meter

• ABS actuator and electric unit (control unit)

• Wheel sensor

• TCM

• Output speed sensor

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.
Combustion control mode	Stratified charge combustion control at starting	No stratified charge combustion at starting (cold start).
	Idle speed control	Stops feedback control of idle speed and controls with specified speed.
	Recovery speed control at decelerating	Stops recovery speed control by the fuel cut at decelerating and controls with specified speed.
	Idle neutral control	Stops idle neutral control.

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

1. CHECK DTC PRIORITY

   If DTC P0500 is displayed with DTC UXXXX or P0607, first perform the trouble diagnosis for DTC UXXXX or P0607.

   Is applicable DTC detected?

   YES >>

   Perform diagnosis of applicable.

   • DTC UXXXX: Refer to DTC Index.

   • DTC P0607: Refer to DTC Description.

   NO >>

   GO TO 2.

2. 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, confirm that battery voltage is 10 V or more at idle.

   >>

   GO TO 3.

3. PERFORM DTC CONFIRMATION PROCEDURE

   1. Start the engine.

   2. Shift the selector lever to D range and wait at least for 2 seconds.

   3. Drive the Nissan Sentra vehicle at least 5 seconds at 20 km/h (13 MPH) or more.

      CAUTION:

      Always drive vehicle at a safe speed.

      Note:

      This procedure may be conducted with the drive wheels lifted in the shop or by driving the Nissan Sentra vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

   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

1. CHECK DTC PRIORITY

   If DTC P0500 is displayed with DTC UXXXX or P0607, first perform the trouble diagnosis for DTC UXXXX or P0607.

   Is applicable DTC detected?

   YES >>

   Perform diagnosis of applicable.

   • DTC UXXXX: Refer to DTC Index.

   • DTC P0607: Refer to DTC Description.

   NO >>

   GO TO 2.

2. CHECK DTC WITH TCM

   Check DTC with TCM. Refer to DTC Index.

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   Perform trouble shooting relevant to DTC indicated.

3. CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

   Check DTC with ABS actuator and electric unit (control unit). Refer to DTC Index.

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   Perform trouble shooting relevant to DTC indicated.

4. CHECK DTC WITH COMBINATION METER

   Check DTC with combination meter. Refer to CONSULT Function (METER/MA)(TYPE A) or Refer to CONSULT Function (METER/MA)(TYPE B).

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Perform trouble shooting relevant to DTC indicated.

5. CHECK INPUT SPEED SENSOR

   Check input speed sensor. Refer to Diagnosis Procedure.

   Is the inspection result normal?

   YES >>

   GO TO 6.

   NO >>

   Repair or replace malfunctioning part.

6. CHECK WHEEL SENSOR

   Check wheel sensor. Refer to DTC Diagnosis Procedure.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   Repair or replace malfunctioning part.

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