P0722-OUTPUT SPEED SENSOR CIRCUIT NO SIGNAL





For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The transmission system uses two speed sensors. One is used to measure input rpm (primary pulley) and one to measure output rpm (secondary pulley).

The Output Speed sensor detects the secondary pulley rpm by the use of a three-wire magnetic pickup device that generates a square wave signal as rotation occurs and is monitored by the Transmission Control Module (TCM). These inputs are essential for proper transmission operation.


  • When Monitored:

    Ignition on, engine running with system voltage between 9.0 and 16.0 volts.

    No detected Primary Speed Sensor and/or Sensor ground DTCs.

  • Set Condition:

    Condition one: Output speed rpm is less than 150 rpm with a Input speed rpm greater than 1000 rpm for the period of 5 seconds.

    Condition two: Vehicle speed is greater than 20 Km/h (12.5 mph) calculated by the last secondary speed with the current Output Speed value equals to 0 rpm for the period of 500 msec.

    Condition three: Both the Input and Output Speed sensors are less than 150 rpm with a actual vehicle speed greater than 10 Km/h. (Note: this is an indication of either the power supply to both sensors is open or the C106 connector is disconnected.)


Possible Causes
  
(T16) TRANSMISSION CONTROL OUTPUT CIRCUIT OPEN
  
(T52) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
  
(T52) OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN
  
(T52) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND
  
(T130) OUTPUT SPEED SENSOR GROUND CIRCUIT OPEN
  
OUTPUT SPEED SENSOR
  
TRANSMISSION CONTROL MODULE
  

Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)



Diagnostic Test

1.CHECK TO SEE IF THE DTC IS ACTIVE



Is the status Active for this DTC or is the STARTS SINCE SET counter 2 or less?

Yes
  • Go To 2


No
  • Go To 9

2.CHECK IF BOTH SPEED SENSORS SHOW NO SIGNAL



Are both the Input and Output Speed Sensor No Signal DTCs set?

Yes


No
  • Go To 3

3.CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN








NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.



Does the test light illuminate brightly?

Yes
  • Go To 4


No

4.CHECK THE (T52) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE








Is the voltage above 0.5 volts?

Yes


No
  • Go To 5

5.CHECK THE (T52) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN






Is the resistance below 5.0 ohms?

Yes
  • Go To 6


No

6.CHECK THE (T52) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND





Is the resistance below 5.0 ohms?

Yes


No
  • Go To 7

7.CHECK THE (T130) OUTPUT SPEED SENSOR GROUND CIRCUIT FOR AN OPEN





Is the resistance below 5.0 ohms?

Yes
  • Go To 8


No

8.CHECK THE OUTPUT SPEED SENSOR






(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

NOTE: Make sure to perform a test drive of the vehicle.




Did the DTC P0722 reset?

Yes
  • Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.
  • Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)


No
  • Repair is complete.

9.INTERMITTENT WIRING AND CONNECTORS





Were there any problems found?

Yes


No
  • Test Complete.