2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1618
DTC P0742
- Torque Converter Clutch (TCC) System Stuck On
Diagnostic Fault Information
Circuit/System Description
Based on input speed and output speed signals, signals from the engine control module (engine speed and throttle opening) and vehicle speed,
smooth lock-up control and slip is performed through the lock-up control solenoid (SLU). The SLU is linearly turned ON and OFF. The lock-up
clutch inside the torque converter is operated, and the pump impeller and turbine runner are connected. Through this, the engine and the automatic
transmission are coupled and engine output is connected directly to the automatic transmission, eliminating transmission loss. Sliding the lock-up
clutch when lock-up is in the OFF range, extends the lock-up range to low vehicle speeds. It also suppresses a rise in engine speed and increases
transmission efficiency, improving fuel economy and at the same time, through the sliding of the lockup clutch, engine vibration can be absorbed
by the torque converter.
Conditions for Running the DTC
P0741
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater less 4 000 RPM.
* Engine torque is more than 0 Nm (0 lb ft).
* The transmission is not in emergency mode.
* Driving in D range.
* TCM communication is normal.
* DTCs P0716, P0717, P0721, P0722, P2759, P2762, P2763, P2764 are not set.
P0742
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 400 RPM.
* Output speed is 0 RPM.
* The transmission is not in emergency mode.
* Driving in D range.
* TCM communication is normal.
* DTCs P0716, P0717, P0721, P0722, P2759, P2762, P2763, P2764 are not set.
Conditions for Setting the DTC
P0741
Detected slip speed is more than 100 RPM 2 s after lockup control is turned on.
P0742
* Detected slip speed is less than 100 RPM 2 s after lockup control is turned off.
* Detects no slip speed in engine stall avoidance control after engine stall detected or no slip speed detected during no lockup control.
Action Taken When the DTC Sets
* DTC P0741 is a Type B DTC.
* DTC P0742 is a Type B DTC.
* The TCM inhibits TCC.
* The TCM freezes transmission adaptive functions.
Conditions for Clearing the DTC
P0741
* DTC P0741 is a Type B DTC.
* Deviation between Engine speed and output speed is less than 30 RPM during lockup control is turned on.
* DTC P0742 is a Type B DTC.
