P0723
DTC P0722 or P0723
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0722
- Output Speed Sensor (OSS) Circuit Low Voltage
DTC P0723
- Output Speed Sensor (OSS) Intermittent
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The output speed sensor (OSS) is a hall-effect type sensor. The sensor faces the front differential transfer drive gear. The sensor receives 8.3-9.3 volts on the OSS supply voltage circuit from the transmission control module (TCM). As the output shaft rotates, the sensor produces a signal frequency based on the machined surface of the output shaft. This signal is transmitted through the OSS signal circuit to the TCM. The TCM uses the OSS signal to determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed and gear ratio.
Conditions for Running the DTC
P0722
* No DTCs P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, or P0723.
* The selected range is not PARK or NEUTRAL.
* The transmission input speed is between 1,000-6,500 RPM.
* The engine speed is between 3,200-5,000 RPM.
* The calc. throttle position is greater than 5 percent.
* The throttle position signal is valid.
* The engine torque is greater than 35 Nm (26 lb ft).
* The engine torque signal is valid.
* The TFT is greater than -40°C (-40°F).
* The engine speed is greater than 400 RPM for 5 seconds.
* The ignition voltage is 8.6 volts or greater.
P0723
* No DTCs P0101, P0102, P0103, P0121, P0122, P0123, P0723, P0973, P0974, P0976, P0977.
* Greater than 5 seconds since last range change.
* The engine speed is greater than 400 RPM for 5 seconds.
* The ignition voltage is greater than 8.6 volts.
Conditions for Setting the DTC
P0722
The transmission output speed is 70 RPM or less for 4.5 seconds.
P0723
* The transmission output speed is 210 RPM or greater for 0.2 second.
* The transmission output speed drops 650 RPM for greater than 1.5 seconds and does not recover.
Action Taken When the DTC Sets
* DTCs P0722 and P0723 are Type A DTCs.
* The TCM freezes transmission adaptive functions.
* The TCM turns OFF the high sided driver, which turns OFF all solenoids.
* The TCM commands maximum line pressure.
* The TCM inhibits Tap Up/Down function.
* The TCM inhibits manual shifting of forward gears.
* The TCM limits the transmission to fifth range and reverse operation.
Conditions for Clearing the DIC/DTC
DTCs P0722 and P0723 are Type A DTCs.
Diagnostic Aids
* Damage or misalignment of the front differential transfer drive gear teeth surface or metallic debris on the face of the sensor may cause a speed sensor malfunction.
* Proper torque of the OSS mounting bolt is critical to proper OSS operation.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Diagrams)
Connector End View Reference
* Component Connector End Views (Connector End Views By Name)
* Inline Harness Connector End Views (Connector End Views By Number)
Description and Operation
Electronic Component Description (Electronic Component Description) for output speed sensor (OSS)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, verify with a scan tool the transmission ISS/OSS Supply Voltage parameter displays OK.
2. Operate the vehicle at 16-32 km/h (10-20 mph) while observing the scan tool transmission OSS parameter. The transmission OSS should vary with the vehicle speed and not drop out.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Ignition OFF, remove the control valve body cover. Refer to Control Valve Body Cover Replacement (Control Valve Body Cover Replacement).
2. Connect the TCM harness connector.
3. Disconnect the OSS harness connector X4 from the control solenoid valve assembly.
4. Ignition ON, test for 8.3-9.3 volts between the OSS voltage circuit terminal A on the control solenoid valve assembly and ground at the transmission case.
• If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement (Service and Repair).
5. Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test (Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test).
6. Inspect the front differential transfer drive gear teeth surface for damage or misalignment and for metallic debris on the face of the sensor. Repair or replace as necessary.
7. If all circuits test normal, replace the output speed sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Important: Perform the Service Fast Learn Adapts (Programming and Relearning) following all transmission related repairs.
* Output Speed Sensor Replacement (Output Speed Sensor Replacement)
Important: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection).
* Control Module References (Programming and Relearning) for control solenoid valve assembly replacement, setup, and programming