Sunday, November 1, 2020

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1734

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1734



* 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.



P0990



DTC P0989 or P0990



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 P0989



- Transmission Fluid Pressure (TFP) Switch 5 Circuit Low Voltage



DTC P0990



- Transmission Fluid Pressure (TFP) Switch 5 Circuit High Voltage



Diagnostic Fault Information



Typical Scan Tool Data



Circuit/System Description



The transmission fluid pressure (TFP) switch 5 is part of the control solenoid valve assembly which has no serviceable parts. The TCM supplies a



signal circuit to the TFP switch 5. The TFP switch 5 has an internal case ground. TFP switch 5 is normally closed or LOW. When oil pressure is



present at the TFP switch 5, the switch is open or HIGH. The normally high pressure control (PC) solenoid 3 controls pressure to the CBR1/4-5-6



clutch regular valve. The TCM monitors the TFP switch 5 signal circuit to determine the position of the CBR1/4-5-6 clutch regulator valve. When



the 4-5-6 clutch is commanded OFF, pressure is present on the TFP switch 5. When the 4-5-6 clutch is commanded ON, the CBR1/4-5-6 clutch



regulator valve moves and pressure to the TFP switch 5 is exhausted through the CBR1/4-5-6 clutch regulator valve.



Conditions for Running the DTC



P0989 or P0990



* 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



P0989



The TCM detects that the TFP switch 5 signal voltage remains LOW after the 4-5-6 clutch transitions from a HIGH pressure state to a LOW



pressure state. The TCM counts each incident. The DTC sets when 15 counts are accumulated.

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