Operation CHARM: Car repair manuals for everyone.
Home >> Buick >> 2011 >> Regal L4-2.4L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0723

P0723




DTC P0722, P0723, P077C, or P077D

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 Circuit No Signal

DTC P0723
- Output Speed Sensor Intermittent

DTC P077C
- Output Speed Sensor Circuit Low Voltage

DTC P077D
- Output Speed Sensor Circuit High Voltage

Diagnostic Fault Information





Typical Scan Tool Data









Circuit/System Description

The output speed sensor (OSS) is a hall-effect type sensor. The OSS mounts to the automatic transmission case assembly and connects to the control solenoid valve assembly through a 2-wire harness and connector. The sensor faces the park gear teeth. The sensor receives battery voltage 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 park gear teeth. 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, vehicle speed and gear ratio.

Conditions for Running the DTC

P0722
* DTC P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, P0722, or P0723 is not set.
* The ignition voltage is 9.0 volts or greater.
* The engine speed is greater than 400 RPM for 5 seconds.
* The engine torque signal is valid.
* The throttle position signal is valid.
* The transmission input speed is between 1,000-8,191 RPM.
* The calc. throttle position is greater than 8 percent.
* The engine torque is greater than 30 Nm (22 lb ft).
* The TFT is greater than -40°C (-40°F).

P0723
* DTC P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, P0723, P0973, P0974, P0976, or P0977 is not set.
* The ignition voltage is 9.0 volts or greater.
* Greater than 5 seconds since last range change.
* The engine torque signal is valid.
* The throttle position signal is valid.

P077C
* DTC P077D is not set.
* The ignition voltage is 9.0 volts or greater.

P077D
* DTC P077C is not set.
* The ignition voltage is 9.0 volts or greater.

Conditions for Setting the DTC

P0722

The transmission output speed is 35 RPM or less for 5 seconds.

P0723
* The transmission output speed is 105 RPM or greater.
* The transmission output speed drops 1,000 RPM for greater than 3 seconds and does not recover.

P077C

The transmission OSS analog signal voltage is 0.25 volts or less for 4 seconds.

P077D

The transmission OSS analog signal voltage is 4.75 volts or greater for 4 seconds.

Action Taken When the DTC Sets

P0722
* DTC P0722 is a Type A DTC.
* The TCM freezes transmission adaptive functions.
* TCM commands maximum line pressure.
* The TCM forces the torque converter clutch (TCC) OFF.
* The TCM limits the transmission to reverse and 2nd gear.
* The TCM inhibits Tap-Up/Tap-Down functions.
* The TCM inhibits manual up, manual down shifts with the shift selector.

P0723, P077C or P077D
* DTCs P0723, P077C, and P077D are Type A DTCs.
* The TCM freezes transmission adaptive functions.
* The TCM forces TCC OFF.
* The TCM commands the high side driver OFF.
* The TCM commands maximum line pressure.
* The TCM enables torque management.
* The TCM limits the transmission to reverse and 5th gear.
* The TCM inhibits Tap-Up/Tap-Down functions.
* The TCM inhibits manual up, manual down shifts with the shift selector.

Conditions for Clearing the DIC/DTC

DTCs P0722, P0723, P077C, and P077D are Type A DTCs.

Diagnostic Aids

Inspect the OSS, harness, and connector for metallic debris and proper alignment of the OSS with the park gear. Proper torque of the OSS mounting bolt is critical to proper OSS operation.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (6T30/6T40/6T45/6T50 - Automatic Transmission)
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

* Transmission General Description (Transmission General Description)
* Transmission Component and System Description (Transmission Component and System Description)
* 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
Special Tools

* DT-48616-10 - Adapter Harness
* EL 38522 - Variable Signal Generator

For equivalent regional tools, refer to Special Tools (6T30/6T40/6T45/6T50 - Automatic Transmission).

Circuit/System Verification

1. Ignition ON, verify with a scan tool the transmission ISS/OSS Supply Voltage test status parameter displays OK.
2. Operate the vehicle at 16-32 km/h (10-20 mph) while observing the Transmission OSS parameter on the scan tool. The Transmission OSS should vary with the vehicle speed and 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 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement (Service and Repair).
2. Connect the DT-48616-10 - harness between the vehicle wire harness electrical connector, and the control solenoid valve assembly.
3. Ignition ON, verify 11-13 volts between the OSS voltage circuit terminal B on the control solenoid valve assembly and ground.

• If not within the specified range, replace the control solenoid valve assembly.

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).
5. Inspect the park gear and OSS alignment with the gear. Repair or replace as necessary.
6. If all of the above test normal, replace the OSS.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Note: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection).

* Refer to Control Module References (Programming and Relearning) for control solenoid valve assembly replacement, setup, and programming.
* Perform the Transmission Adaptive Values Learn (Programming and Relearning) following all transmission related repairs.
* Perform the Input and Output Speed Sensor Removal (4. Input and Output Speed Sensor Removal) and the Input and Output Speed Sensor Installation (42. Input and Output Speed Sensor Installation).

pro multis · About Operation CHARM