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 VEH SPD SEN/CIR AT with CONSULT-II or P0720 without CONSULT-II is detected when TCM does not receive the proper voltage signal from the sensor.

Possible Cause
Check the following items.
- Harness or connectors (The sensor circuit is open or shorted.)
- Revolution sensor

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 DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 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 AT-502, Diagnostic 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 (O/D 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-502, 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 (O/D 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





TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL

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.
- Harness for short or open between TCM, ECM and revolution sensor
- 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-499, 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.