Diagnostic Instructions

DTC Descriptors

DTC P0722:  Output Speed Sensor (OSS) Circuit Low Voltage

DTC P0723:  Output Speed Sensor (OSS) Intermittent

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
OSS High Signal	P0722, P0723	P0722, P0723	P0722, P0723	P0722, P0723
OSS Supply Voltage	P0722, P0723	P0722, P0723	P0722, P0723	P0722, P0723

Typical Scan Tool Data

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Operating Conditions: Drive vehicle, normal operating temperature Parameter Normal Range: 100-7,000 RPM
ISS/OSS Supply Voltage	Out of Range	Out of Range	Out of Range
Transmission OSS	0 RPM	0 RPM	0 RPM

Circuit/System Description

The automatic transmission (AT) output speed sensor (OSS) is a hall-effect type sensor. The OSS mounts to the control valve upper body assembly and connects to the control solenoid (w/body and TCM) valve assembly through a 2-wire harness and connector. The sensor faces the output shaft machined teeth surface. The sensor receives 8.3-9.3 volts on the input/output speed sensor (ISS/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

P0723

Conditions for Setting the DTC

P0722

The transmission output speed is 70 RPM or less for 4.5 seconds.

P0723

Action Taken When the DTC Sets

Conditions for Clearing the DIC/DTC

DTCs P0722 and P0723 are Type A DTCs.

Diagnostic Aids

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

Circuit/System Verification

Operate the vehicle at 16-32 km/h (10-20 mph) while observing the transmission OSS on the scan tool. The transmission OSS should vary with the vehicle speed and not drop out.

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

Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, remove the control valve body cover. Refer to Control Valve Body Cover Removal in Control Valve Body Assembly Removal .
2. Connect the DT-48616-10 .
3. Disconnect the OSS from the control solenoid (w/body and TCM) valve assembly.
4. Connect the J 38522 between the high and low signal terminals of the control solenoid (w/body and TCM) valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test for further instructions.
5. Set the J 38522 Signal to 8 volts, the Frequency to 120 and the Percent Duty Cycle to 50.
6. Ignition ON, observe the scan tool Transmission OSS parameter. The scan tool Transmission OSS parameter should be between 100-400 RPM.

⇒	If the Transmission OSS parameter is between 100-400 RPM, replace the ISS/OSS assembly.

⇒	If no OSS RPM is displayed or the parameter is out of range, replace the control solenoid (w/body and TCM) valve assembly.

7. Inspect the 3-5-R clutch piston housing machined teeth surface for damage or misalignment.

⇒	If a condition is found, repair or replace as necessary.

8. If all circuits test normal, test or replace the output speed sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.