P0720

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

Description





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





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 increase.
If the check result is NG, go to AT-126, DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE.
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 1.2V
Selector lever: D position (OD ON)
Driving location: 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 AT-129, Diagnostic Procedure.
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 1.2V
Selector lever: D position (OD ON)
Driving 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-II.

Wiring Diagram-AT-VSSA/T

AT-VSSA/T-01:

AT-VSSA/T-01

Diagnostic Procedure
1. CHECK INPUT SIGNAL (WITH CONSULT-II)

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.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.

2. CHECK REVOLUTION SENSOR (WITH CONSULT-II)

With CONSULT-II





1. Start engine.
- Check harness for short or open between TCM. ECM and revolution sensor. Refer to Wiring Diagram-AT-VSSA/T.
- Check harness for short or open between ignition switch and revolution sensor.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.

3. CHECK DTC
Perform AT-126, DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE.
OK or NG
OK >> INSPECTION END
NG >> GO TO 4.

4. CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection. Pinout Values and Diagnostic Parameters
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.