2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2261

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2261

6. If all of the above test normal, replace the B14A/B14C ISS/OSS assembly.

Repair Instructions

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

* Perform the Input and Output Speed Sensor Replacement (See: Powertrain Management/Transmission Control Systems/Sensors and

Switches - Transmission and Drivetrain/Sensors and Switches - A/T/Transmission Speed Sensor/Service and Repair/6L45/6L50/6L80/6L90 -

Automatic Transmission).

* Control solenoid valve assembly - refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for

replacement, setup, and programming.

* Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test (See:

Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General

Diagnostics/6L45/6L50/6L80/6L90 - Automatic Transmission/Control Solenoid Valve and Transmission Control Module Assembly Input

Shaft Speed/Output Shaft Speed Input Test).

* Perform the Service Fast Learn Adapts (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and

Inspection/Programming and Relearning) following all transmission related repairs.

P0721

DTC P0721-P0723

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0721

- Output Speed Sensor Performance

DTC P0722

- Output Speed Sensor Circuit Low Voltage

DTC P0723

- Output Speed Sensor Circuit Intermittent

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The Automatic Transmission Output Shaft Speed Sensor assembly has 2 internal hall-effect type sensors, and is capable of sensing both speed and

direction. The Automatic Transmission Output Shaft Speed Sensor mounts to the A/T rear case assembly and is connected to the control solenoid

valve assembly through a wire harness and connector. The sensor faces the hybrid direct, 2-3-4 clutch housing assembly machined teeth surface.

The sensor receives 8.3-9.3 volts on the OSS supply voltage circuit from the transmission control module. As the output shaft rotates, the sensor

produces a signal frequency based on the machined surface of the output shaft.

The two sensor elements in the Automatic Transmission Output Shaft Speed Sensor assembly are spaced approximately 1/2 a tooth apart.

* When the vehicle is moving in a forward direction, sensor A detects a particular tooth before sensor B.