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





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 NO, go to "DIAGNOSTIC PROCEDURE", AT-202.
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 NO, go to "DIAGNOSTIC PROCEDURE", AT-119.
If the check result is OK, go 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".





Wiring Diagram-AT-VSSA/T

Diagnostic Procedure





1. Check Revolution Sensor





2. Check Input Signal





3. Check DTC

Component Inspection
REVOLUTION SENSOR








- Check resistance between terminals 1 and 2.