Nissan Sentra manuals

Nissan Sentra Service Manual: P0720 Output speed sensor

DTC Logic

DTC DETECTION LOGIC

DTC

CONSULT screen terms (Trouble diagnosis content)

DTC detection condition

Possible causes

P0720 OUTPUT SPEED SENSOR (Output Speed Sensor Circuit) The output speed sensor value is less than 150 rpm continuously for 5 seconds or more under the following diagnosis conditions:

Diagnosis conditions

  • Selector lever: “D”, “L” or “R” position
  • Auxiliary gearbox shifting is not in progress.
  • When the “D” position switch, “L” position switch or “R” position switch is ON, the output speed has not experienced 250 rpm or more.
  • After shifting the selector lever, the input speed has experienced less than 300 rpm.
  • Secondary pulley speed: 1,500 rpm or more
  • TCM power supply voltage: More than 11 V
  • Harness or connector (Output speed sensor circuit is open or shorted)
  • Output speed sensor
The output speed sensor value is 90 rpm or less continuously for 500 msec or more under the following diagnosis conditions:

Diagnosis conditions

  • 10-msec-ago output speed: 730 rpm or more
  • TCM power supply voltage: More than 11 V

DTC CONFIRMATION PROCEDURE

CAUTION:

Be careful of the driving speed.

1.PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.

>> GO TO 2.

2.CHECK DTC DETECTION

  1. Start the engine.
  2. Drive the vehicle.
  3. Maintain the following conditions for 10 seconds or more.

Selector lever : “D” position

Vehicle speed : 55 km/h (34 MPH) or more

  1. Stop the vehicle.
  2. Check the first trip DTC.

Is “P0720” detected? YES >> Go to TM-181, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK OUTPUT SPEED SENSOR POWER CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect output speed sensor connector.
  3. Turn ignition switch ON.
  4. Check voltage between output speed sensor harness connector terminal and ground.

Is the check result normal?


Is the check result normal? YES >> GO TO 2.

NO >> GO TO 6.

2.CHECK OUTPUT SPEED SENSOR GROUND CIRCUIT

Check the continuity between output speed sensor harness connector terminal and ground.

Is the check result normal?


Is the check result normal? YES >> GO TO 3.

NO >> Repair or replace malfunctioning parts.

3.CHECK CIRCUIT BETWEEN OUTPUT SPEED SENSOR AND TCM (PART 1)

  1. Turn ignition switch OFF.
  2. Disconnect TCM connector
  3. Check continuity between output speed sensor harness connector terminal and TCM harness connector terminal.

Is the check result normal?


Is the check result normal? YES >> GO TO 4.

NO >> Repair or replace malfunctioning parts.

4.CHECK CIRCUIT BETWEEN OUTPUT SPEED SENSOR AND TCM (PART 2)

Check continuity between output speed sensor harness connector terminal and ground.

Is the check result normal?


Is the check result normal? YES >> GO TO 5.

NO >> Repair or replace malfunctioning parts.

5.Check tcm input signals

  1. Connect all of disconnected connectors.
  2. Lift the vehicle.
  3. Start the engine.
  4. Check frequency of output speed sensor.

Is the check result normal?


Is the check result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace output speed sensor. Refer to TM-270, "Exploded View".

6.DETECT MALFUNCTIONING ITEMS

Check the following items:

Is the check result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Repair or replace malfunctioning parts.

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