P0720

P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)

Description
The revolution sensor detects the revolution of the parking gear and emits a pulse signal. The pulse signal is transmitted to the TCM which converts it into vehicle speed.

DTC Logic

P0720:

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

1. CHECK REVOLUTION SENSOR AND VEHICLE SPEED SENSOR MTR

With CONSULT-III
1. Start the engine.
2. Select "Data Monitor" mode for "TRANSMISSION".
3. Drive vehicle and check for an increase of "VHCL/S SE-A/T" value in response to "VHCL/S SE-MTR" value.
VHCL/S SE-A/T: Approximately matches the speedometer reading.
VHCL/S SE-MTR: Approximately matches the speedometer reading.
Are "VHCL/S SE-A/T" and "VHCL/S SE-MTR" values correct?
YES >> GO TO 2.
NO >> Go to "Diagnosis Procedure".

2. CHECK DTC DETECTION 1

With CONSULT-III
1. Select "Data Monitor" mode for "TRANSMISSION".
2. Drive vehicle and maintain the following conditions for at least 5 consecutive seconds.
VHCL/S SE-A/T: 30 km/h (19 MPH) or more
ACCELE POSI: More than 1.0/8
SLCT LVR POSI: "D" position
Drive 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-III".
Is "P0720 VEH SPD SEN/CIR AT" detected?
YES >> Go to "Diagnosis Procedure".
NO >> GO TO 3.

3. CHECK DTC DETECTION 2

With CONSULT-III
1. Select "Data Monitor" mode for "TRANSMISSION".
2. Drive vehicle and maintain the following conditions for at least 5 consecutive seconds.
ACCELE POSI: More than 1.0/8
ENGINE SPEED: 3,500 rpm or more
SLCT LVR POSI: "D" position
Drive 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-III".
Is "P0720 VEH SPD SEN/CIR AT" detected?
YES >> Go to "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI-38, "Intermittent Incident". Service Information For Electrical Incident

Diagnosis Procedure

1. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to TM-89, "Diagnosis Procedure". Main Power Supply and Ground Circuit
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace damaged parts.

2. CHECK SUB-HARNESS
1. Disconnect park/neutral position switch connector and TCM connector.
2. Check continuity between park/neutral position switch connector terminals and TCM connector terminals.





Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.

3. DETECT MALFUNCTIONING ITEM
Check the following.
^ Check terminals of park/neutral position switch connector and TCM connector, and harness cladding for damage.
^ Check connector for loose connection.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace damaged parts.

4. REPLACE THE REVOLUTION SENSOR AND CHECK DTC
1. Replace the revolution sensor.
2. Reinstall any parts removed.
3. Perform "DTC CONFIRMATION PROCEDURE". Refer to "DTC Logic".
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace the control valve with TCM.