2010 Cadillac CTS Sedan AWD V6-3.6L Page 1469
Typical Scan Tool Information
Circuit/System Description
Vehicle speed information is provided to the engine control module (ECM) by the vehicle speed sensor (VSS). The VSS consists of a hall-effect
sensor mounted to the transmission case which interfaces with a rotor pressed onto the transmission output shaft. The hall-effect sensor contains a
permanent magnet and a semiconductor plate to which ignition voltage is applied. As the output shaft spins, the rotor directs the field of the
permanent magnet either toward or away from the plate. The VSS produces a frequency signal that is proportional to vehicle speed. The ECM
converts the VSS signal to vehicle speed, displayed on the scan tool in kilometers per hour or miles per hour. The ECM also uses the VSS signal to
generate the 4,000 pulses per mile vehicle speed signal used by the instrument cluster.
Conditions for Running the DTC
* The engine speed is greater than 1800 RPM for 3 seconds.
* The engine coolant temperature (ECT) is greater than 40掳C (104掳F).
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)
