Nissan Altima (L32) 2007-2012 Service Manual: P0720 vehicle speed sensor cvt (secondary speed sensor)

Description

The vehicle speed sensor CVT [output speed sensor (secondary speed sensor)] detects the revolution of the CVT output shaft and emits a pulse signal. The pulse signal is sent to the TCM, which converts it into vehicle speed.

DTC Logic

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION: Always drive vehicle at a safe speed.

NOTE: If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch OFF.

Then wait at least 10 seconds before performing the next test.

1.CHECK DTC DETECTION

1. Turn ignition switch ON.

2. Select “DATA MONITOR”.

3. Start engine and maintain the following conditions for at least 12 consecutive seconds.

Follow the procedure “With CONSULT-III”.

Is “P0720 VEH SPD SEN/CIR AT” detected? YES >> Go to TM-138, "Diagnosis Procedure".

NO >> Check intermittent incident. Refer to GI-42, "Intermittent Incident".

Diagnosis Procedure

1.CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR)

1. Start engine.

2. Check voltage between TCM harness connector F16 terminal 7 and 46 and 7 and 48.

3. If OK, check the pulse when vehicle cruises.

Is the inspection result normal? YES >> GO TO 11.

NO >> GO TO 2.

2.CHECK POWER AND SENSOR GROUND

1. Turn ignition switch OFF.

2. Disconnect output speed sensor (secondary speed sensor) harness connector.

3. Turn ignition switch ON.

4. Check voltage between output speed sensor (secondary speed sensor) harness connector F23 terminal 1 and 3.

5. Check voltage between output speed sensor (secondary speed sensor) harness connector F23 terminal 3 and ground.

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

NO-1 >> Battery voltage is not supplied between terminals 1 and 3, terminals 3 and ground: GO TO 6.

NO-2 >> Battery voltage is not supplied between terminals 1 and 3 only: GO TO 8.

3.CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (SENSOR GROUND)

1. Turn ignition switch OFF.

2. Disconnect TCM harness connector.

3. Check continuity between TCM harness connector F16 terminal 7 and ground.

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

NO >> Repair or replace damaged parts.

4.CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (PART 1)

Check continuity between TCM harness connector F16 (A) terminal 34 and output speed sensor (secondary speed sensor) harness connector F23 (B) terminal 2.

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

NO >> Repair or replace damaged parts.

5.CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (PART 2)

Check continuity between TCM harness connector F16 terminal 34 and ground.

Is the inspection result normal? YES >> GO TO 10.

NO >> Repair or replace damaged parts.

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

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector F10.

3. Check continuity between IPDM E/R harness connector F10 (A) terminal 58 and output speed sensor (secondary speed sensor) harness connector F23 (B) terminal 3.

Is the inspection result normal? YES >> GO TO 7.

NO >> Repair or replace damaged parts.

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

Check continuity between IPDM E/R harness connector F10 terminal 58 and ground.

Is the inspection result normal? YES >> Check the following. If NG, repair or replace damaged parts.

• Harness for short or open between ignition switch and IPDM E/R

• 10A fuse (No. 34, located in IPDM E/R)

• Ignition switch

NO >> Repair or replace damaged parts.

8.CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (SENSOR GROUND) (PART 1)

1. Turn ignition switch OFF.

2. Disconnect TCM harness connector.

3. Check continuity between TCM harness connector F16 (A) terminal 7 and output speed sensor (secondary speed sensor) harness connector F23 (B) terminal 1.

Is the inspection result normal? YES >> GO TO 9.

NO >> Repair or replace damaged parts.

9.CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (SENSOR GROUND) (PART 2)

Check continuity between TCM harness connector F16 terminal 7 and ground.

Is the inspection result normal? YES >> GO TO 10.

NO >> Repair or replace damaged parts.

10.CHECK TCM

1. Replace same type TCM. Refer to TM-254, "Exploded View".

2. Connect each connector.

3. Perform “DTC CONFIRMATION PROCEDURE”. Refer to TM-138, "DTC Logic".

Is “P0720 VEH SPD SEN/CIR AT” detected? YES >> Replace transaxle assembly. Refer to TM-259, "Exploded View".

NO >> Replace TCM. Refer to TM-254, "Exploded View".

11.DETECT MALFUNCTIONING ITEMS

Check TCM connector pin terminals for damage or loose connection with harness connector.

Is the inspection result normal? YES >> Replace TCM. Refer to TM-254, "Exploded View".

NO >> Repair or replace damaged parts.