Tuesday, July 7, 2020

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1690

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1690



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



* Control solenoid valve assembly replacement. Refer to Control Module References (See: Testing and Inspection/Programming and



Relearning) for replacement, setup, and programming.



* Perform the Service Fast Learn Adapts (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and



Inspection/Programming and Relearning/Service Fast Learn Adapts) following all transmission related repairs.



P0873



DTC P0872 or P0873



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 Descriptors



DTC P0872



- Transmission Fluid Pressure (TFP) Switch 3 Circuit Low Voltage



DTC P0873



- Transmission Fluid Pressure (TFP) Switch 3 Circuit High Voltage



Diagnostic Fault Information



Typical Scan Tool Data



Circuit/System Description



The transmission fluid pressure (TFP) switch 3 is part of the control solenoid valve assembly which has no serviceable parts. The TCM supplies a



signal circuit to the TFP switch 3. The TFP switch 3 has an internal case ground. TFP switch 3 is normally closed or LOW. When oil pressure is



present at the TFP switch 3, the switch is open or HIGH. The normally low clutch pressure control (PC) solenoid 4 controls pressure to the 2-6



clutch regulator valve. The TCM monitors the TFP switch 3 to determine the position of the 2-6 clutch regulator valve. When the 2-6 clutch is



commanded OFF, pressure is present on the TFP switch 3. When the 2-6 clutch is commanded ON, the 2-6 clutch regulator valve moves and



pressure is exhausted through the 2-6 clutch regulator valve.



Conditions for Running the DTC



P0872 or P0873



* DTCs P0711, P0712, P0713, P0973, P0974, P0976, P0977, P1915, or P182E are not set.



* Ignition voltage is 8.6 volts or greater.



* The transmission fluid temperature (TFT) is 0-120掳C (32-248掳F).



* Engine speed is 500 RPM or greater for 5 seconds.



Conditions for Setting the DTC