Automatic Transaxle System > Automatic Transaxle System > Troubleshooting > P0722 Output Speed Sensor Circuit No Signal

Component Location

General Description

The Output Speed Sensor outputs pulse-signals according to the revolutions of the output shaft of the transmission. The Output Speed Sensor is installed inside transmission. This value, together with the throttle position data, is mainly used to decide the optimum gear position.

DTC Description

The TCM sets this code if the calculated value of the pulse-signal is noticeably different from the value calculated, using the Vehicle Speed Sensor output. The TCM will initiate the fail safe function if this code is detected.

DTC Detecting Condition

Item

Detecting Condition

Possible cause

DTC Strategy

•	Check the speed range

•	Faulty OUTPUT SPEED SENSOR.

•	Faulty PCM/TCM

•	Signal circuit is open or short

Enable Conditions

•	Engine speed > 400rpm

•	10.2V <Battery voltage <15.5V

•	System is normal

•	TCU communication = normal

•	Shift lever switch = normal

Threshold value

•	To detect no pulse while detecting input revolution sensor signal 16 pulses

Diagnostic Time

•	More than 500 times × more than1sec

Fail Safe

•	Self learning control is inhibited

•	Locked in 3rd gear

Schematic Diagram

Monitor Scantool Data

1.	Connect scan tool to data link connector(DLC).

2.	Engine "ON".

3.	Monitor the "OUTPUT SPEED SENSOR" parameter on the scantool.

Driving at speed of over 19 Mile/h(30 Km/h).

Specification : Increasing Gradually

Does "output speed sensor" follow the reference data?

	▶ Fault is intermittent caused by poor contact in the sensor's and/or TCM(PCM)'s connector or was repaired and TCM(PCM) memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Terminal and connector inspection" procedure.

Terminal And Connector Inspection

1.	Many malfunctions in the electrical system may be caused from poor harness and terminal condition. These faults can be caused by interference from other electrical systems and mechanical or chemical damage.

2.	Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of vehicle repair" procedure.
	▶ Go to "Signal circuit inspection" procedure.

Signal Circuit Inspection

1.	Engine "OFF" IG KEY "OFF".

2.	Remove the TCU.

Perform the continuity test between "OUTPUT SPEED SENSOR" sensor terminal and chassis ground.

Specification : Not continuity

Is resistance within specifications?

	▶ Substitute with a known-good PCM/TCM and check for proper operation. If the problem is corrected, replace PCM/TCM as necessary and then go to "Verification of Vehicle Repair" procedure.
	▶ Replace "TRANSAXLE FLUID TEMPERATURE SENSOR" as necessary and Go to "Verification of Vehicle Repair" procedure.

NOTE)

When replacing the TCU, must perform the N position learning and the Initial learning. (refer to Troubleshooting's 'How to perform N position learning' and 'How to perform initial learning')

Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.

1.	Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode

2.	Using a scantool, Clear DTC.

3.	Operate the vehicle within DTC Enable conditions in General information.

Are you DTCs present?

	▶ Go to the applicable troubleshooting procedure.
	▶ System performing to specification at this time.