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	Under the following diagnosis conditions, the output speed sensor value is less than 100 rpm continuously for 5 seconds or more. - Diagnosis condition - Selector lever: Shift to a position other than P or N. - Throttle position: More than 0.0/8.0 - Input speed: More than 1,000 rpm	Harness or connector (Open circuit or short circuit in the output speed sensor circuit) Output speed sensor

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. Maintain the following conditions for 10 seconds or more.
3. Stop the vehicle.
4. Check the first trip DTC.

Selector lever : N position ⇒ D position

Throttle position : 0.5/8.0 or more

Engine speed : More than 1,500 rpm

Is "P0720" detected?

YES >> Go to TM, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK OUTPUT SPEED SENSOR POWER CIRCUIT (CHECK 1)

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

Is the check result normal?

YES >> GO TO 2.

NO >> GO TO 6.

2.CHECK OUTPUT SPEED SENSOR GROUND CIRCUIT

1. Turn ignition switch OFF.
2. Check the continuity between the output speed sensor harness connector and ground. 

Is the check result normal?

YES >> GO TO 3.

NO >> Check or repair the malfunction items.

3.CHECK OUTPUT SPEED SENSOR SIGNAL CIRCUIT (CHECK 1)

1. Disconnect the TCM connector.
2. Check the continuity between the output speed sensor harness connector and the TCM harness connector.

Is the check result normal?

YES >> GO TO 4.

NO >> Check or repair the malfunction items.

4.CHECK OUTPUT SPEED SENSOR SIGNAL CIRCUIT (CHECK 2)

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

Is the check result normal?

YES >> GO TO 5.

NO >> Check or repair the malfunction items.

5.CHECK OUTPUT SPEED SENSOR SIGNAL

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

Is the check result normal?

YES >> Perform a simulation test to judge the cause of the malfunction. Refer to GI, "Intermittent Incident".

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

6.CHECK OUTPUT SPEED SENSOR POWER CIRCUIT (CHECK 2)

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

Is the check result normal?

YES >> GO TO 7.

NO >> Repair or replace the malfunctioning parts.

7.CHECK OUTPUT SPEED SENSOR POWER CIRCUIT (CHECK 3)

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

Is the check result normal?

YES >> GO TO 8.

NO >> Repair or replace the malfunctioning parts.

8.DETECTION OF MALFUNCTION ITEMS

• Check the following items:
• Harness open circuit or short circuit between the ignition switch and IPDM E/R. Refer to PG, "Wiring Diagram - Ignition Power Supply -".
• 10 A fuse (#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 the malfunctioning parts.