Nissan Maxima Service and Repair Manual: P0720 output speed sensor

Description

The 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: Immediately after performing any "DTC CONFIRMATION PROCEDURE", always turn ignition switch OFF.

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

1.CHECK DTC DETECTION

With CONSULT

1.  Turn ignition switch ON.
2.  Select "Data Monitor" in "TRANSMISSION".
3.  Start engine and maintain the following conditions for at least 12 consecutive seconds.

ACC PEDAL OPEN : More than 1.0/8

RANGE : "D" position

Driving location : Driving the vehicle uphill (increased engine load) will help maintain the driving conditions required for this test.

With GST

Follow the procedure "With CONSULT".

Diagnosis Procedure

Regarding Wiring Diagram information, refer to TM-126, "Wiring Diagram".

1.CHECK SECONDARY SPEED SENSOR

With CONSULT

Check the pulse when vehicle drive.

2.CHECK POWER AND SENSOR GROUND

1.  Turn ignition switch OFF.
2.  Disconnect secondary speed sensor connector.
3.  Turn ignition switch ON.
4.  Check voltage between secondary speed sensor vehicle side harness connector terminals.

5. Check voltage between secondary speed sensor vehicle side harness connector terminal and ground.

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

1.  Turn ignition switch OFF.

2.  Disconnect TCM connector.

3.  Check continuity between TCM vehicle side harness connector terminal and ground.

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

Check continuity between TCM vehicle side harness connector terminal and secondary speed sensor vehicle side harness connector terminal.

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

Check continuity between TCM vehicle side harness connector terminal and ground.

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

1.  Turn ignition switch OFF.
2.  Disconnect IPDM E/R connector.
3.  Check continuity between IPDM E/R vehicle side harness connector terminal and secondary speed sensor vehicle side harness connector terminal.

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

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

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

1.  Turn ignition switch OFF.

2.  Disconnect TCM connector.

3.  Check continuity between TCM vehicle side harness connector terminal and secondary speed sensor vehicle side harness connector terminal.

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

Check continuity between TCM vehicle side harness connector terminal and ground.

10.CHECK TCM

1.  Replace with the same type of TCM. Refer to TM-168, "Exploded View".
2.  Perform "DTC CONFIRMATION PROCEDURE". Refer to TM-60, "DTC Logic".

11.DETECT MALFUNCTIONING ITEMS

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