Nissan Versa (N17): P0720 Output speed sensor

DTC Logic

DTC DETECTION LOGIC

DTC	Trouble diagnosis name	DTC detection condition	Possible causes
P0720	Output Speed Sensor Circuit	The output speed sensor value is less than 150 rpm continuously for 10 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.
4. Stop the vehicle.
5. Check the first trip DTC.

Selector lever : "D" position Vehicle speed : 55 km/h (34 MPH) or more

Is "P0720" detected?

YES >> Go to TM "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 inspection result normal?

YES >> GO TO 2.

NO >> GO TO 6.

2.CHECK OUTPUT SPEED SENSOR GROUND CIRCUIT

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

Is the inspection 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 inspection 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 inspection 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 inspection result normal?

YES >> Check intermittent incident. Refer to GI "Intermittent Incident".

NO >> Replace output speed sensor. Refer to TM "Removal and Installation".

6.CHECK CIRCUIT BETWEEN IPDM E/R AND OUTPUT SPEED SENSOR (PART 1)

1. Disconnect IPDM E/R connector.
2. Check continuity between IPDM E/R harness connector terminal and output speed sensor harness connector terminal.                                                                            

Is the check result normal?

YES >> GO TO 7.

NO >> Repair or replace malfunctioning parts.

7.CHECK CIRCUIT BETWEEN IPDM E/R AND OUTPUT SPEED SENSOR (PART 2)

Check continuity between IPDM E/R harness connector terminal and ground.           

Is the check result normal?

YES >> GO TO 8.

NO >> Repair or replace malfunctioning parts.

8.DETECT MALFUNCTIONING ITEMS

Check the following items:

• Harness open circuit or short circuit between ignition switch and IPDM E/R. Refer to PG "Wiring Diagram - Ignition Power Supply -".
• 10A fuse (No.49, IPDM E/R). Refer to PG "IPDM E/R Terminal Arrangement".
• IPDM E/R

Is the check result normal?

YES >> Check intermittent incident. Refer to GI "Intermittent Incident".

NO >> Repair or replace malfunctioning parts.