2010 Cadillac Truck SRX FWD V6-3.0L Page 1784

2010 Cadillac Truck SRX FWD 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.