P0723
DTC P0722 or P0723
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0722
- Output Speed Sensor Circuit Low Voltage
DTC P0723
- Output Speed Sensor Circuit Intermittent
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The output speed sensor (OSS) system is a pulse generator consisting of a speed sensor assembly, located in the case extension, and a toothed vehicle speed sensor reluctor wheel, which is pressed onto the final drive carrier assembly. As the vehicle drives forward, the vehicle speed sensor reluctor wheel rotates. This rotation produces a variable AC signal in the pickup coil that is proportional to vehicle speed. The transmission control module (TCM) uses this signal in order to calculate vehicle speed, shift timing, and gear ratios.
Conditions for Running the DTC
P0722
* No TP sensor DTCs P0120 or P0220.
* No ISS DTCs P0716 or P0717.
* No OSS DTC P0723.
* The calc. throttle position is 8 percent or more.
* The input shaft speed is 1,500-5,000 RPM.
* The TCC slip speed is -20 RPM or more.
* The TFT is -40°C (-40°F) or more.
* The engine speed is greater than 500 RPM for 5 seconds.
* The engine torque is greater than 50 N.m (37 lb ft).
* The transmission range is not PARK or NEUTRAL.
P0723
* No ISS DTCs P0716 or P0717.
* No 1-2 SS electrical DTC P0974.
* The time since the last gear selector range change is 6 seconds or more.
* The output speed is 1,000 RPM or greater for 2 seconds.
* No transmission OSS rise 500 RPM or greater for 2 seconds.
* The ISS changes 500 RPM or less for 2 seconds.
* The engine speed is greater than 500 RPM for 5 seconds.
* The engine torque is greater than 50 N.m (37 lb ft).
* The transmission range is not PARK or NEUTRAL.
Conditions for Setting the DTC
P0722
* The output shaft speed is 200 RPM or less for 4.5 seconds.
* The engine must be above 50 N.m (37 lb ft) in Drive range.
P0723
The output shaft speed drops greater than 1,200 RPM for 3.25 seconds.
Action Taken When the DTC Sets
* DTCs P0722 and P0723 are type B DTCs.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
* The TCM calculates output speed based on ISS, engine speed, and commanded gear.
Conditions for Clearing the DTC
DTCs P0722 and P0723 are type B DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views
Description and Operation
Electronic Component Description (Electronic Component Description) for output speed sensor information
Electrical Information Reference
* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Raise and support the drive wheels.
2. Start and idle the engine.
3. Place the transmission in DRIVE.
4. Monitor Transmission OSS on the scan tool.
5. The Transmission OSS on the scan tool should be greater than 70 RPM.
Circuit/System Testing
1. With the drive wheels supported, the engine running and the transmission in DRIVE ensure the Transmission OSS parameter on the scan tool is greater than 200 RPM.
• If the value is less than 200 RPM, disconnect the TCM connector and using a terminal test kit connect the DMM between the OSS high signal and the OSS low signal circuits.
2. Measure the resistance between the OSS high signal circuit and the OSS low signal circuit. The resistance should be between 1,500-1,900 ohms.
• If the value is greater than 1,900 ohms test the OSS high signal circuit and the OSS low signal circuit for an open.
• If the value is less than 1,500 ohms test the OSS high signal and the OSS low signal circuits for a shorted together condition.
3. Measure the resistance of the OSS high signal circuit to ground. The resistance should be greater than 10K ohms.
• If the value is less than 10K ohms, repair the short to ground.
4. Measure the resistance between the ISS low signal circuit and ground. The resistance should be greater than 10K ohms.
• If the value is less than 10K ohms, repair the short to ground.
5. Reconnect the TCM connector. Disconnect the OSS connector. Ignition ON, test the ISS high signal circuit for a short to voltage.
• If all circuits/connections test normal, test or replace the OSS.
Component Testing
1. Verify the OSS resistance is between 1,500-1,900 ohms.
• If the resistance is not within the specified range, replace the OSS.
2. Using a terminal test kit connect the DMM between the OSS high signal and the OSS low signal circuits at the OSS connector. Raise and support the drive wheels. While rotating the drive wheels by hand ensure the AC voltage reading on the DMM is above 0.4 volts.
• If the AC voltage is not above 0.4 volts, replace the OSS.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
* Vehicle Speed Sensor Replacement (Service and Repair)
* Control Module References for TCM replacement, setup, and programming