Friday, February 7, 2020

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1473

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1473



Repair Instructions



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



* Vehicle Speed Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Sensors and Switches - Computers and



Control Systems/Vehicle Speed Sensor/Service and Repair/Tremec 6-Speed - Manual Transmission)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming



P0503



DTC P0502 or P0503



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 Descriptor



DTC P0502



- Vehicle Speed Sensor (VSS) Circuit Low Voltage



DTC P0503



- Vehicle Speed Sensor (VSS) Circuit Intermittent



Diagnostic Fault Information



Circuit/System Description



The vehicle speed information is provided to the engine control module (ECM) by the vehicle speed sensor (VSS). The VSS is a permanent magnet



generator that is mounted to the transmission and produces a pulsing voltage. The AC voltage amplitude and frequency increases with vehicle



speed. The ECM converts the pulsing voltage into km/h (mph). The ECM supplies the VSS signal to the following components:



* The instrument panel for speedometer and odometer operation



* The cruise control module



Conditions for Running the DTC



P0502



* DTC P0120, P0220 or P0503 are not set.



* The TP sensor angle is more than 3.5 percent.



* The engine is running.



* The system voltage is 8-18V.



* TFT is more than -40掳C (-40掳F)



* The engine speed is 1,500-6,500 RPM.



* Vehicle speed is less than 200 km/h (124 mph).



* Engine torque is 68-8192 Nm (50-6,042 lb ft).



P0503



* The system voltage is 8-18V.



* The engine speed is 500-7,500 RPM.



* Transmission out speed change is less than 146 RPM for 2 seconds.



Conditions for Setting the DTC



P0502



The transmission output speed is 58 RPM or less for 5 seconds.

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