2010 Cadillac CTS Sedan AWD V6-3.6L Page 1474
P0503
The transmission output speed drops 351 RPMs in less than 3 seconds.
Action Taken When the DTC Sets
P0502 and P0503 are Type B DTCs.
Conditions for Clearing the DTC
P0502 and P0503 are Type B DTCs.
Reference Information
Schematic Reference
Manual Transmission Schematics (See: Transmission and Drivetrain/Manual Transmission/Transaxle/Diagrams/Electrical Diagrams/Tremec
6-Speed - Manual Transmission)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Manual Transmission Description and Operation (See: Transmission and Drivetrain/Manual Transmission/Transaxle/Description and
Operation/Tremec 6-Speed - Manual Transmission/Manual Transmission Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/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)
Special Tools
J 35616 - GM-Approved Terminal Test Kit
For equivalent regional tools, refer to Special Tools (See: Transmission and Drivetrain/Manual Transmission/Transaxle/Tools and
Equipment/Tremec 6-Speed - Manual Transmission).
Circuit/System Verification
1. Raise and support the drive wheels.
Caution: Support the lower control arms in the normal horizontal position in order to avoid damage to the drive axles. Do not operate the
vehicle in gear with the wheels hanging down at full travel.
2. Support the lower control arms so that the drive axles are in a horizontal position.
3. Start and idle the engine.
4. Place the transmission in second gear and release the clutch pedal.
5. Monitor VSS parameter on the scan tool. The VSS parameter should increase as the drive wheel speed increases.
6. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in
the Freeze Frame/Failure Records List.
Circuit/System Testing
1. Disconnect the ECM harness connector X1.
2. Measure for 1,300-1,500 ohms at 25掳C (77掳F) between the VSS high signal circuit terminal 66 and the VSS low signal circuit terminal 67.
瀚慖f the value is greater than 1,500 ohms test the VSS high signal circuit and the VSS low signal circuit for an open/high resistance. If the
circuits/connections test normal, replace the vehicle speed sensor.
瀚慖f the value is less than 1,300 ohms test the VSS high signal and the VSS low signal circuits for a shorted together condition. If the
