4T40-E / 4T45-E Automatic Transaxle

DTC P0741





Circuit Description with 4T40-E / 4T45-E Automatic Transaxle
The torque converter clutch (TCC) solenoid valve is a pulse width modulation (PWM) solenoid. When vehicle operating conditions are appropriate for TCC application, the transmission control module (TCM) begins the TCC duty cycle at approximately 42 percent. The TCM then increases the duty cycle up to 90 percent, in order to achieve full TCC apply pressure.

When the TCC PWM solenoid valve is de-energized, the solenoid blocks filtered 2-3 drive fluid, and allows TCC signal fluid to exhaust. When energized, the solenoid modulates fluid into the TCC signal fluid circuit. When fully energized, modulation stops, and the solenoid blocks both 2-3 drive fluid and TCC signal fluid exhaust.

When the TCM detects a high TCC slip speed when the TCC is commanded ON, 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 MAP DTCs P0107 or P0108.
^ No TP DTCs P0122 or P0123.
^ No ISS DTCs P0716 or P0717.
^ No VSS DTCs P0722 or P0723.
^ No TCC stuck ON DTC P0742.
^ No TCC release switch DTC P1887.
^ No TCC electrical DTC P2761.
^ The engine is running for greater than 5 seconds.
^ The transmission fluid temperature (TFT) is 20 - 130°C (68 - 266°F).
^ The commanded gear is 2nd, 3rd or 4th.
^ The TP is between 8 percent and 80 percent.
^ The TCC duty cycle is more than 60 percent for greater than 5 seconds.
^ The engine torque is greater than 50 Nm (37 ft. lbs.).
^ The gear ratio is 0.61:1 to 1.71:1.
^ The time since the last range change is greater than 6 seconds.

Conditions for Setting the DTC
The TCC slip speed is greater than 200 RPM for 5 seconds.

Action Taken When the DTC Sets
^ The TCM requests the engine control module (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 freezes transmission adaptive functions.
^ The TCM inhibits 4th gear when in HOT mode.
^ The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as 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 drive trip in which the TCM does not send a 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
^ Inspect the transmission fluid level.
^ The transmission may be in hot mode. Inspect the transmission fluid lines to the radiator. The lines may be pinched, plugged or twisted.

Test Description





The numbers below refer to the step numbers on the diagnostic table.
2. This step inspects the transmission fluid to ensure that it is at the proper level.
3. This step verifies that the TCC engages when commanded ON by the scan tool.