Wednesday, July 28, 2021

2010 Cadillac Truck SRX AWD V6-3.0L Page 1784

2010 Cadillac Truck SRX AWD V6-3.0L Page 1784



programming



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



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 to the TFP switch 3 is exhausted through the 2-6 clutch regulator valve.



Conditions for Running the DTC



P0872 or P0873



* No DTCs P0711, P0712, P0713, P0716, P0717, P0722, P0723, P0742, P0751, P0756, P0757, P0973, P0974, P0976, P0977, P1915, or



P182E.



* The high side driver is on.



* The engine speed is 400 RPM or greater for 5 seconds.



* The engine speed is 550 RPM or greater.



* Ignition voltage is 8.6 volts or greater.



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



Conditions for Setting the DTC



P0872



The TCM detects that the TFP switch 3 signal voltage remains LOW after the 2-6 clutch transitions from a HIGH pressure state to a LOW pressure



state. The TCM counts each incident. The DTC sets when 18 counts are accumulated.



P0873



The TCM detects that the TFP switch 3 signal voltage remains HIGH after the 2-6 clutch transitions from a LOW pressure state to a HIGH pressure



state. The TCM counts each incident. The DTC sets when 20 counts are accumulated.



Action Taken When the DTC Sets



* DTCs P0872 and P0873 are Type C DTCs.



* The TCM freezes transmission adaptive functions for the 2-6 clutch.

No comments:

Post a Comment