P0720

DTC P0720 - OUTPUT SPEED SENSOR CIRCUIT

OUTLINE OF DIAGNOSIS
Judge NG when an abnormal large signal is input to the front vehicle speed sensor, or no signal is input to the rear vehicle speed sensor.

COMPONENT DESCRIPTION
This vehicle speed sensor (output shaft speed sensor) is installed to the outside of transmission case.
This sensor detects the front wheel speed, and transmits the sine wave signal (32 pulses per rev.) to TCM.
TCM converts the signal to pulse signal,




ENABLE CONDITION

GENERAL DRIVING CYCLE
Always perform the diagnosis with more than 20 km/h (12 MPH) vehicle speed.




DIAGNOSTIC METHOD

DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When " Clear Memory " was performed

MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When " Clear Memory " was performed

FAIL SAFE
- Use the normal vehicle speed sensor signal when either of them is normal.
- Use the vehicle speed calculated from the current gear position and turbine speed when both front and rear wheels are troubled.

ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)