2010 Cadillac CTS Sedan AWD V6-3.0L Page 1688

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2010 Cadillac CTS Sedan AWD V6-3.0L Page 1688



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



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 20 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 18 counts are accumulated.



Action Taken When the DTC Sets



* DTCs P0872 and P0873 are Type C DTCs.



* The TCM freezes transmission adaptive functions.



Conditions for Clearing the DTC



DTCs P0872 and P0873 are Type C DTCs.



Diagnostic Aids



A TFP switch may malfunction due to normal debris in the transmission fluid causing a TFP Switch DTC to intermittently set. This type of



condition should not be immediately noticeable to a customer, as the switch outputs are used for shift adaptive pressure and do not cause



transmission symptoms unless the switch malfunctions continuously for an extended period of time.

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