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-III 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-III 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.

NOTE:
If "DTC Confirmation Procedure" has been previously performed, always turn ignition switch OFF and wait at least 10 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-III
1. Turn ignition switch ON and select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
2. 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.
3. If DTC is detected, go to CVT-77, "Diagnostic Procedure".

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

Wiring Diagram - CVT - SESCVT

CVT-SESCVT-01:

TCM TERMINALS AND REFERENCE VALUES
Refer to CVT-44, "TCM Input/Output Signal Reference Value". Pinout Values and Diagnostic Parameters

Diagnostic Procedure

1.CHECK INPUT SIGNAL

With CONSULT-III
1. Start engine.
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
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-III
1. Start engine.
2. Check power supply to output speed sensor (secondary speed sensor) by voltage between TCM connector terminals 7, 46 and 48.

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 (A) and output speed sensor (secondary speed sensor) harness connector (B).

3. Check continuity between TCM connector (A) terminal and output speed sensor (secondary speed sensor) harness connector (B) 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-75, "DTC Confirmation Procedure".
Is "P0720 VEH SPD SEN/CIR CVT" detected again?
YES >> Replace the Secondary speed sensor.
NO >> Replace TCM.

6.CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (POWER)
1. Turn ignition switch OFF.
2. Disconnect TCM connector, IPDM E/R connector, input speed sensor (primary speed sensor) and output speed sensor (secondary speed sensor) harness connector.
3. Check continuity between TCM connector terminals, IPDM E/R harness connector terminal, input speed sensor (primary speed sensor) harness 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 >> 10 A fuse (No. 49, 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 (A) and output speed sensor (secondary speed sensor) harness connector (B).