2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2263
* 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.
Circuit/System Testing
1. Ignition ON, test for 8.3-9.3 V between the automatic transmission output shaft speed sensor ignition circuit terminal A and ground.
瀚慖f less than the specified range, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the control solenoid valve assembly.
瀚慖f greater than the specified range, test the ignition circuit for a short to voltage. If the circuit tests normal, replace the control solenoid
valve assembly.
2. Ignition Off, connect the red lead of J 38522 to the signal circuit terminal B and the black lead to the ignition circuit terminal A.
3. Adjust the J 38522 to 8 V, the Frequency to 120 Hz and the Percent Duty Cycle to 50 percent.
4. Ignition ON, verify the scan tool Transmission OSS parameter is between 100-400 RPM.
瀚慖f not within the specified range, test the signal circuit for a short to voltage short to ground open/high resistance. If the circuit tests
normal, replace the control solenoid valve assembly.
5. If all circuits test normal, test or replace the B14A Automatic Transmission Output Shaft Speed Sensor.
Component Testing
Perform the Control Solenoid Valve and Transmission Control Module Assembly Output Shaft Speed Input Test (See: Transmission and
Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/2ML70 - Automatic
Transmission/Control Solenoid Valve and Transmission Control Module Assembly Output Shaft Speed Input Test).
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* 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/2ML70 - Automatic Transmission) for B14A
Automatic Transmission Output Shaft Speed Sensor replacement
* Control Module References (See: Testing and Inspection/Programming and Relearning) for Q8 control solenoid valve assembly
replacement, setup, and programming
2ML70 - Automatic Transmission
DTC P0721-P0723
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
