4T65-E Automatic Transaxle
DTC P0741
Circuit Description
The PCM 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 PCM 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 PCM 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 VSS DTC P0502 or P0503.
* No ISS DTC P0716 or P0717.
* No TCC stuck ON DTC P0742.
* No TCC release switch DTC P1887.
* No TCC PWM solenoid valve DTC P2761.
* The engine speed is greater than 500 RPM for 5 seconds and not in fuel cut off.
* The engine torque is greater than 28 N.m (21 lb ft).
* The transmission fluid temperature is between 20°C (68°F) and 130°C (266°F).
* The TP angle is 4-99 percent.
* The IMS indicates D2, D3 or D4.
* The TCC duty cycle is greater than 50 percent.
Conditions for Setting the DTC
The TCC slip speed is 180 RPM or more for 7 seconds twice in the same ignition cycle.
Action Taken When the DTC Sets
* The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
* The PCM inhibits TCC engagement.
* The PCM inhibits 4th gear if the transmission is in Hot Mode.
* The PCM freezes transmission adaptive functions.
* The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.
* The PCM stores DTC P0741 in PCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.
Conditions for Clearing the MIL/DTC
* The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
* A scan tool can clear the MIL/DTC.
* The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
* The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM.
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.
* An intermittent short to voltage in the signal circuit may also set this DTC.
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.
Step 1 - Step 6:
Step 7 - Step 12:
