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 automatic transmission (AT) input and output speed sensor (ISS and OSS) assembly each are part of a single harness. The OSS is a hall-effect type sensor. The ISS/OSS mounts to the control valve upper body assembly. The sensor end faces the output shaft housing machined slots. The sensor receives 8.3-9.3 volts on the ISS/OSS supply voltage circuit from the control solenoid valve assembly. As the output shaft rotates, the sensor produces a signal frequency based on the machined slots of the output shaft housing. This signal is transmitted through the OSS signal circuit to the control solenoid valve assembly. The control solenoid valve assembly 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
* DTCs P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, or P0722 are not set.
* Ignition voltage is 8.6 volts or greater.
* The engine speed is 400 RPM or greater for 5 seconds.
* The TCM must receive a valid torque signal from the ECM.
* The engine torque is greater than 0 Nm (0 lb ft).
* Accelerator pedal position signal is valid.
* Transmission fluid temperature (TFT) is greater than 0°C (32°F).
* The selected range is not PARK or NEUTRAL.
* The transmission input speed is between 653-5350 RPM.
* The throttle position is greater than zero percent.
P0723
* DTCs P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, P0722, P0723, P0973, P0974, P0976, or P0977 are not set.
* Ignition voltage is 8.6 volts or greater.
* The engine speed is 3200 RPM or greater for 5 seconds.
* Greater than 5 seconds since last range change.
* The TCM must receive a valid torque signal from the ECM.
* Accelerator pedal position signal is valid.
Conditions for Setting the DTC
P0722
* The TCM detects no output shaft speed when there is vehicle speed.
* The transmission output speed is 35 RPM or less for 5 seconds.
P0723
* The TCM detects an unrealistic drop in output shaft speed.
* The transmission input speed has not changed by more than 4100 RPM for 2 seconds.
* The transmission output speed has not changed by more than 8200 RPM for 2 seconds.
* The transmission output speed drops 650 RPM and does not recover for 1.5 seconds.
Action Taken When the DTC Sets
P0722
* DTC P0722 is a Type A DTC.
* The transmission defaults to second gear.
* The TCM enables torque management.
* The TCM freezes transmission adaptive functions.
* The TCM turns OFF all solenoids.
* The TCM turns OFF the TCC solenoid.
P0723
* DTC P0723 is a Type A DTC.
* The high side driver is turned OFF.
* The TCM turns OFF all solenoids.
* The TCM freezes transmission adaptive functions.
* The TCM enables torque management.
Conditions for Clearing the DIC/DTC
DTCs P0722 and P0723 are Type A DTCs.
Diagnostic Aids
Inspect the ISS/OSS, harness, connector and control solenoid valve assembly for metallic debris and output shaft housing machined slots for damage or misalignment. Proper torque of the ISS/OSS mounting bolt is critical to proper speed sensor operation.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views Fuel Pump and Level Sensor Assembly - Primary
* Inline Harness Connector End Views X102
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
Description and Operation
Electronic Component Description Electronic Component Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
DT-47825-10 - Jumper Harness
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Ignition ON, verify with a scan tool the transmission ISS/OSS supply voltage test status parameter displays OK.
• If the parameter value displays Fault or Malfunction
Refer to Circuit/System Testing.
• If the parameter value displays OK
2. Operate the vehicle between 16-32 km/h (10-20 mph) while observing the Transmission OSS parameter on the scan tool. The Transmission OSS parameter value should vary with vehicle speed and not drop out.
• If the parameter value does not vary with vehicle speed or drops out
Refer to Circuit/System Testing below.
• If the parameter value does vary with vehicle speed and does not drop out
3. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.
Circuit/System Testing
Note:
You must perform the Circuit/System Verification first.
1. Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
2. Connect the DT-47825-10 - jumper harness between the vehicle wire harness electrical connector and the Q8 control solenoid valve assembly electrical connector.
3. Ignition ON, test for 8.3-9.3 volts between the ISS/OSS voltage circuit terminal B on the Q8 control solenoid valve assembly and ground at the transmission case.
• If not between 8.3-9.3 volts
Replace the Q8 control solenoid valve assembly.
• If between 8.3-9.3 volts
4. 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.
• If the Q8 control solenoid valve assembly does not pass the ISS/OSS test
Replace the Q8 control solenoid valve assembly.
• If the Q8 control solenoid valve assembly passes the ISS/OSS test
5. Inspect the machined teeth on the 1-2-3-4 and 3-5 clutch housing outer surfaces for damage or misalignment.
• If the machined surfaces are incorrect, damaged, or improper alignment
Repair or replace as necessary.
• If the machined surfaces and alignment checks OK
6. Replace the B14A/B14C ISS/OSS assembly.
Repair Instructions
* Perform the Reset Transmission Adapts Reset Procedure following all transmission related repairs.
* Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Perform the Input and Output Speed Sensor Replacement Service and Repair.
* Control Module References Control Module References for control solenoid valve assembly replacement, programming, and setup.
* 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.