P0741
DTC P0741
Circuit Description
The TCM controls the torque converter clutch pulse width modulation (TCC PWM) solenoid valve. The solenoid controls the hydraulic fluid for TCC apply and release. When the TCC is fully applied, the engine is coupled directly to the transmission through the TCC.
The TCC used is an electronically controlled capacity clutch (ECCC). The TCM will normally allow a small amount of slip to occur with the ECCC. When the TCC is engaged, TCC slip speed is maintained at approximately 20 to 50 RPM.
If the TCM detects high torque converter slip when the TCC is commanded ON, then DTC P0741 sets. DTC P0741 is a type B DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0741 Torque Converter Clutch (TCC) System - Stuck Off
Conditions for Running the DTC
^ No TP sensor DTC P0120 or P0220.
^ No ISS DTC P0716 or P0717.
^ No VSS DTC P0722 or P0723.
^ No TCC stuck ON DTC P0742.
^ No TCC release switch DTC P0842 or P0843.
^ The engine speed is greater than 500 RPM for 5 seconds.
^ The transmission fluid temperature is 20 - 130°C (68 - 266°F).
^ The calc. throttle position is between 8 and 90 percent.
^ The TCC PWM solenoid valve is commanded ON.
^ The TCC duty cycle is greater than 65 percent for 5 seconds.
^ The engine torque is 50 Nm (37 ft. lbs.) or more.
^ The commanded gear is 2nd, 3rd or 4th.
Conditions for Setting the DTC
The TCC slip speed is 175 RPM or greater for 5 seconds 6 times during the same ignition cycle.
Action Taken When the DTC Sets
^ The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
^ The TCM forces the TCC OFF.
^ The TCM inhibits TCC engagement.
^ The TCM inhibits 4th gear if the transmission is in Hot Mode.
^ The TCM freezes transmission adaptive functions.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Freeze Frame and Failure Records.
^ The TCM stores DTC P0741 in TCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.
Conditions for Clearing the MIL/DTC
^ The ECM turns OFF the MIL after the third consecutive trip in which the TCM does not send an MIL illumination request.
^ A scan tool can clear the MIL/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.
Diagnostic Aids
^ Prior to replacing the torque converter refer to the Torque Converter Replacement Guide. Torque Converter Replacement Guide
^ Residue or contamination may cause valves to stick intermittently.
Test Description
The number below refers to the step number on the diagnostic table.
3. This step verifies that the TCC engages when commanded ON by the scan tool.
