Nissan Altima 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 transmitted 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-318, "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, 46 and 7, 48.
3. If OK, check 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 connector F10.
3. Check continuity between IPDM E/R harness connector F10 (A) terminal58 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.
• 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 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-430, "Exploded View".
2. Connect each connector.
3. Perform “DTC CONFIRMATION PROCEDURE”. Refer to TM-318, "DTC Logic".
Is “P0720 VEH SPD SEN/CIR AT” detected? YES >> Replace output speed sensor (secondary speed sensor). Refer to TM-438, "Removal and Installation".
NO >> Replace TCM. Refer to TM-430, "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-430, "Exploded View".
NO >> Repair or replace damaged parts.
P0715 input speed sensor (pri speed
sensor)
Description
The input speed sensor (primary speed sensor) detects the primary pulley
revolution speed and sends a signal
to the TCM.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE ...
P0725 engine speed signal
Description
The engine speed signal is transmitted from ECM to TCM by CAN communication
line.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a saf ...
Other materials:
Additional service when replacing
control unit
Description
When replacing ECM, the following procedure must be performed.
Special Repair Requirement
1.PERFORM INITIALIZATION OF NVIS (NATS) SYSTEM AND REGISTRATION OF ALL
NVIS (NATS) IGNITION
KEY IDS
Refer to SEC-15, "ECM RE-COMMUNICATING FUNCTION : Special Repair Requireme ...
Additional service when replacing
control unit
Description
Initial setting is necessary when replacing main power window and door
lock/unlock switch.
CAUTION:
The following specified operations are not performed under the non-initialized
condition.
• Auto-up operation
• Anti-pinch function
• Retained power operation
Spe ...
P1574 ASCD Vehicle speed sensor
Description
The ECM receives two vehicle speed signals via CAN communication line. One is
sent from combination
meter, and the other is from TCM (Transmission control module). The ECM uses
these signals for ASCD control.
Refer to EC-603, "System Description" for ASCD functions.
D ...