2010 Cadillac CTS Sedan AWD V6-3.6L Page 1467
Conditions for Setting the DTC
The VSS indicates a speed of less than 0 km/h (0 mph) for 4 seconds.
Action Taken When the DTC Sets
* P0501 and P0502 are Type B DTCs.
* The ECM disables cruise control.
Conditions for Clearing the MIL/DTC
P0501 and P0502 are Type B DTCs.
Diagnostic Aids
The battery must be fully charged and pass a battery test. Refer to Battery Inspection/Test (See: Starting and Charging/Testing and
Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).
Reference Information
Schematic Reference
Manual Transmission Schematics (See: Transmission and Drivetrain/Manual Transmission/Transaxle/Diagrams/Electrical Diagrams/Aisin AY6 -
Manual Transmission)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Transmission System Description and Operation (See: Transmission and Drivetrain/Manual Transmission/Transaxle/Description and
Operation/Aisin AY6 - Manual Transmission)
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)
Circuit/System Verification
1. Operate the vehicle on the road at 40 MPH. Observe the transmission vehicle speed sensor parameter with a scan tool. The VSS signal should
match the instrument panel speedometer indicator.
2. Operate the vehicle within the Conditions for Running the DTC, to verify the DTC does not reset. You may also operate the vehicle within
the conditions that you observed from the Freeze Frame/Failure Records.
Circuit/System Testing
1. Ignition OFF, disconnect the X2 harness connector at the ECM.
2. Disconnect the VSS harness connector.
3. Ignition OFF, test for less than 5 ohms of resistance between the ground circuit at the VSS harness connector terminal 2 and ground.
瀚慖f greater than the specified value, repair the open/high resistance condition.
4. Ignition ON, test for less than 1 volt between the signal circuit terminal 1 and ground at the VSS harness connector.
瀚慖f greater than the specified value, test the signal circuit for a short to voltage.
5. Ignition ON, test for greater than 11 volts between the ignition voltage circuit, at the VSS harness connector terminal 3, and ground.
瀚慖f less than the specified value, test the ignition voltage circuit for a short to ground or an open/high resistance.
