P0720

DTC 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.





CONSULT-II Reference Value

On Board Diagnosis Logic
- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0720 VEH SPD SEN/CIR AT" with CONSULT-II is detected TCM does not receive the proper signal from the sensor.

Possible Cause
- Harness or connectors
(Sensor circuit is open or shorted.)
- Output speed sensor (Secondary speed sensor)

DTC Confirmation Procedure

CAUTION:
- Always drive vehicle at a safe speed.
- Be careful not to rev engine into the red zone on the tachometer.

NOTE: If "DTC Confirmation Procedure" has been previously performed, always turn ignition switch OFF and wait at least 5 seconds before performing the next test.

After the repair, touch "ERASE" on "SELF-DIAG RESULTS" and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-II





1. Turn ignition switch ON and select "DATA MONITOR" mode for "ENGINE" with CONSULT-II.
2. Start engine and maintain the following conditions for at least 12 consecutive seconds.
ACC PEDAL OPEN: More than 1/8
Selector lever: "D" position
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving conditions required for this test.
3. If DTC is detected, go to CVT-102, "Diagnostic Procedure".

WITH GST
Follow the procedure "WITH CONSULT-II".

CVT-SESCVT-01:

Wiring Diagram-CVT-SESCVT

Diagnostic Procedure
1. CHECK INPUT SIGNAL

With CONSULT-II
1. Start engine.








2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-II.
3. Start vehicle and read out the value of "VSP SENSOR".
OK or NG
OK >> GO TO 8.
NG >> GO TO 2.

2. CHECK SECONDARY SPEED SENSOR
With CONSULT-II
1. Start engine.








2. Check power supply to output speed sensor (secondary speed sensor) by voltage between TCM connector terminals 10 (Y/L), 19 (Y/L) and 42 (W/R). Refer to "Circuit Diagram".








3. If OK, check the pulse when vehicle cruises.
OK or NG
OK >> GO TO 8.
NG >> GO TO 3.

3. CHECK POWER AND SENSOR GROUND
1. Turn ignition switch OFF.
2. Disconnect the 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 terminals.








5. Check voltage between output speed sensor (secondary speed sensor) harness connector terminal and ground.
6. If OK, check harness for short to ground and short to power.
7. Reinstall any part removed.
OK or NG
OK >> GO TO 4.
NG - 1 >> Battery voltage is not supplied between terminals 1 and 3, terminals 1 and ground.: GO TO 6.
NG - 2 >> Battery voltage is not supplied between terminals 1 and 3 only.: GO TO 7.

4. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR)
1. Turn ignition switch OFF.
2. Disconnect TCM connector and output speed sensor (secondary speed sensor) harness connector.








3. Check continuity between TCM connector terminal and output speed sensor (secondary speed sensor) harness connector terminal.
4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.

5. CHECK THE TCM SHORT
Replace same type TCM, perform self-diagnosis check. Erase self-diagnostic results and them drive the vehicle [more than 40 km/h (25 MPH)], perform self-diagnosis check. Refer to CVT-100, "DTC Confirmation Procedure".
Is "P0720 VEH SPD SEN/CIR AT" detected again?
YES >> Replace the transaxle assembly. Refer to "Removal and Installation".
NO >> Replace TCM. Refer to "Precautions for TCM and CVT Assembly Replacement".

6. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR)(POWER)
1. Turn ignition switch OFF.
2. Disconnect TCM connector and output speed sensor (secondary speed sensor) harness connector.








3. Check continuity between TCM connector terminal and output speed sensor (secondary speed sensor) harness connector terminal. Refer to "Circuit Diagram".
4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK >> 10A fuse (No. 83, located in the IPDM E/R) or ignition switch are malfunctioning.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.

7. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (SENSOR GROUND)
1. Turn ignition switch OFF.
2. Disconnect TCM connector and output speed sensor (secondary speed sensor) harness connector.








3. Check continuity between TCM connector terminal and output speed sensor (secondary speed sensor) harness connector terminal. Refer to "Circuit Diagram".
4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK >> GO TO 8.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.

8. CHECK DTC
Perform "DTC Confirmation Procedure". Refer to CVT-100, "DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 9.

9. CHECK TCM
1. Check TCM input/output signal. Refer to CVT-57, "TCM Input/Output Signal Reference Values". Pinout Values and Diagnostic Parameters
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.