2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2265

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2265

The transmission control module detects an invalid Automatic Transmission Output Shaft Speed Sensor direction.

P0722

* The transmission control module detects no signal from the Automatic Transmission Output Shaft Speed Sensor.

* The transmission output speed is less than 50 RPM for 1.5 seconds.

P0723

* The transmission control module detects an unrealistic signal drop from the Automatic Transmission Output Shaft Speed Sensor.

* Automatic Transmission Output Shaft Speed Sensor DTC P0723 has not failed this ignition.

* The transmission output speed is 1,000 RPM or greater for 6 seconds.

* The transmission output speed drops 1,300 RPM for greater than 4 seconds and does not recover.

Action Taken When the DTC Sets

P0721

The transmission control module calculates vehicle direction.

P0722 and P0723

The transmission control module calculates vehicle speed based on the wheel speed sensors.

Conditions for Clearing the DTC

* P0723 is a Type A DTC.

* P0721 and P0722 are a Type B DTC.

Diagnostic Aids

Inspect the Automatic Transmission Output Shaft Speed Sensor, harness, and connector pins for metallic debris and the hybrid direct, 2-3-4 clutch

housing assembly machined teeth for damage or misalignment. Even one bent or misaligned tooth, and or contact with the Automatic Transmission

Output Shaft Speed Sensor, may cause this DTC to set. Proper torque of 9-13 Nm (80-115 lb in) to the Automatic Transmission Output Shaft

Speed Sensor mounting bolt is critical to proper Automatic Transmission Output Shaft Speed Sensor operation. The hybrid system is very sensitive

to the Automatic Transmission Output Shaft Speed Sensor signal for overall operation.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information.

Special Tools

J 38522 Variable Signal Generator

Circuit/System Verification

1. Operate the vehicle at 16-32 km/h (10-20 mph), observe the scan tool Transmission OSS parameter. The reading should be greater than 150

RPM and not drop out.

2. Observe the scan tool OSS Supply Voltage parameter. The reading should display OK.