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P0722







P0722-OUTPUT SPEED SENSOR CIRCUIT NO SIGNAL





For a complete wiring diagram Refer to Diagrams/Electrical.

Theory of Operation


The Output Speed sensor is used to determine gear position by applying the signal to a static shift schedule map. The Output Speed sensor is also used together with Input Speed sensor to calculate gear ratios. The TCM compares Output shaft speed to Vehicle speed buss messages to diagnosis the system. If the TCM detects a fault with the Output speed signal, it switches to vehicle speed to determine gear position.

Condition One:


When Monitored:
- The calculated Output Speed based on Input Speed is greater than 250 rpm.
- Transmission Range is not in Park or Neutral.


Set Condition:
- 48,500 consecutive Input Speed sensor pulses without Output Speed sensor pulses for 2 consecutive Ignition cycles.

Condition Two:


When Monitored:
- Wheel Speed is greater than 250 rpm for 4 seconds.
- Engine Speed is greater than 300 rpm.


Set Condition:
- 500 consecutive Wheel Speed sensor pulses without Output Speed sensor pulses for 2 consecutive Ignition cycles.







Always perform the AS68RC Pre-Diagnostic Troubleshooting procedure before proceeding. AS68RC Pre-Diagnostic Troubleshooting Procedure


Diagnostic Test


1. CHECK IF THE DTC IS CURRENT
Ignition on, engine not running.
With the scan tool, read Transmission DTCs.
Record the Freeze Frame data for the reported DTC.
With the scan tool, erase DTCs.
Using the Freeze Frame data recorded earlier, try to duplicate the conditions in which the DTC originally set.

NOTE: It may be necessary to road test the vehicle to duplicate the original set conditions.

With the scan tool, read Transmission DTCs.
Did the DTC reset?

Yes


- Go To 2


No


- Go To 11



2. CHECK THE (T72) 8 VOLT SUPPLY CIRCUIT




Turn the ignition off to the lock position.
Disconnect the Output Speed Sensor harness connector.
Ignition on, engine not running.
Measure the voltage of the (T72) 8 Volt Supply circuit in the Output Speed Sensor harness connector.
Is the voltage 8.0 volts (± 0.2 volts)?

Yes


- Go To 3


No


- Go To 4



3. LOAD TEST THE (T72) 8 VOLT SUPPLY CIRCUIT




Turn the ignition off to the lock position.
Disconnect the TCM C2 harness connector.
Disconnect the Input Speed Sensor and the Output Speed Sensor harness connectors.
Using a jumper wire, ground the (T72) 8 Volt Supply circuit in the Output Speed Sensor harness connector.
Using a 12 volt test light connected to B (+), probe the (T72) 8 Volt Supply circuit on the appropriate terminal of TCM C2 harness connector.
Does the test light illuminate brightly?

Yes


- Go To 6


No


- Go To 4



4. CHECK THE (T72) 8 VOLT SUPPLY CIRCUIT FOR AN OPEN




Turn the ignition off to the lock position.
Disconnect the TCM C2 harness connector.
Measure the resistance of the (T72) 8 Volt Supply circuit between the TCM C2 harness connector and the Output Speed Sensor harness connector.
Is the resistance below 5.0 ohms?

Yes


- Go To 5


No


- Repair the (T72) 8 Volt Supply circuit for an open.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test



5. CHECK THE (T72) 8 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND




Measure the resistance between ground and the (T72) 8 Volt Supply Signal circuit.
Is the resistance below 100k ohms?

Yes


- Repair the (T72) 8 Volt Supply circuit for a short to ground.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test


No


- Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test



6. CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN




Disconnect the TCM C2 harness connector.
Disconnect the Output Speed Sensor harness connector.
Measure the resistance of the (T14) Output Speed Sensor Signal circuit between the TCM C2 harness connector and the Output Speed Sensor harness connector.
Is the resistance below 5.0 ohms?

Yes


- Go To 7


No


- Repair the (T14) Output Speed Sensor Signal circuit for an open.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test



7. CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND




Measure the resistance between ground and the (T14) Output Speed Sensor Signal circuit.
Is the resistance below 100k ohms?

Yes


- Repair the (T14) Output Speed Sensor Signal circuit for a short to ground.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test


No


- Go To 8



8. CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT




Measure the resistance between the (T14) Output Speed Sensor Signal circuit and all other circuits in the TCM C2 harness connector.
Is the resistance below 100k ohms between the (T14) Output Speed Sensor Signal circuit and any other circuit(s) in the TCM C2 harness connector?

Yes


- Repair the (T14) Output Speed Sensor Signal circuit for a short to another circuit(s).
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test


No


- Go To 9



9. CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE




Ignition on, engine not running.
Measure the voltage of the (T14) Output Speed Sensor Signal circuit.
Is there any voltage present?

Yes


- Repair the (T14) Output Speed Sensor Signal circuit for a short to voltage.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test


No


- Go To 10



10. REPLACE THE OUTPUT SPEED SENSOR
Turn the ignition off to the lock position.
Replace the Output Speed Sensor.
Inspect the internal tone ring for damaged or missing teeth.
Reconnect all connectors.
Clear DTCs and road test the vehicle under the conditions in which the original DTC set.
Did the Output Speed Sensor DTC reset?

Yes


- Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test


No


- Test complete.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test



11. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Use the Freeze Frame Data to help duplicate the conditions in which the DTC originally set. Pay particular attention to the DTC set conditions, such as, VSS, MAP, ECT, and Load
Using the schematics as a guide, visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Wiggle the wiring and connectors while checking for any possible open or shorted circuits.
Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.
Were there any problems found?

Yes


- Repair as necessary.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test


No


- Test Complete.

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