P0720

DTC P0720 VEHICLE SPEED SENSOR-A/T (REVOLUTION SENSOR)

Description





The revolution sensor detects the revolution of the output shaft parking pawl lock gear and emits a pulse signal. The pulse signal is sent to the TCM which converts it into vehicle speed.

TCM TERMINALS AND REFERENCE VALUE





Remarks: Specification data are reference values.





ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE (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 "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch OFF and wait at least 5 seconds before conducting the next test. After the repair, perform the following procedure to confirm the malfunction is eliminated.

With CONSULT-II





1. Turn ignition switch ON and select "DATA MONITOR" mode for "A/T" with CONSULT-II.
2. Drive vehicle and check for an increase of "VHCL/S SE MTR" value.
If the check result is NG, go to "Diagnostic Procedure" below.
If the check result is OK, go to following step.





3. Select "DATA MONITOR" mode for "ENGINE" with CONSULT-II.
4. Start engine and maintain the following conditions for at least 5 consecutive seconds.
VHCL SPEED SE: 30 km/h (19 MPH) or more
THRTL POS SEN: More than 1.2 volts
Selector lever: D position (O/D ON)
Driving condition: Driving the vehicle uphill (increased engine load) will help maintain the driving conditions required for this test.
If the check result is NG, go to "Diagnostic Procedure" below. If the check result is OK. no to following step.

5. Maintain the following conditions for at least 5 consecutive seconds.
CMPS.RPM (REP): 3,500 rpm or more
THRTL POS SEN: More than 1.2 Volts
Selector lever: D position (O/D ON)
Driving condition: Driving the vehicle uphill (increased engine load) will help maintain the driving conditions required for this test.

With GST





- Follow the procedure "With CONSULT-II".

AT-VSSAT-01:

Wiring Diagram-AT-VSSA/T

Diagnostic Procedure
1. CHECK REVOLUTION SENSOR

OK or NG
OK >> GO T0 2.
NG >> Repair or replace revolution sensor.
2. CHECK INPUT SIGNAL

With CONSULT-ii
1. Start engine.
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.





3. Read out the value of "VHCL/S SE A/T" while driving. Check the value changes according to driving speed.

Without CONSULT-II
1. Start engine.





2. Check voltage between TCM harness connector M78 terminal 29 (Y) and ground while driving. (Measure with AC range)
Voltage
At 0 km/h (0 MPH): 0 Volts
At 30 km/h (19 MPH): 1 Volts or more
(Voltage rises gradually in response to vehicle speed.)

OK or NG
OK >> GO TO 3.
NG >> Check the following items:
- Harness for short or open between TCM and revolution sensor (Main harness)
- Harness for short or open between revolution sensor harness connector E73 and ECM harness connector M78
- Ground circuit for ECM Refer to "TROUBLE DIAGNOSIS FOR POWER SUPPLY". Main Power Supply and Ground Circuit Testing

3. CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure.

OK or NG
OK >> INSPECTION END
NG >>
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

Component Inspection
REVOLUTION SENSOR








- For removal, refer to Transmission Removal and Installation.
- Check resistance between terminals 1 and 2.