P0741

Circuit Description

The PCM controls the torque converter clutch (TCC) solenoid valve pulse width modulation (PWM). The solenoid controls the hydraulic fluid for TCC apply and release. When the TCC is applied, the engine is coupled directly to the transmission through the TCC. The TCC slip speed should be near 0. 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.

Conditions for Running the DTC

^ No MAF DTCs P0101, P0102, or P0103.
^ No TIP DTCs P0121, P0122, or P0123.
^ No VSS DTCs P0502, or P0503.
^ No A/T Input (shaft) Speed Sensor (ISS) DTCs P0716, or P0717.
^ No TCC Stuck ON DTC P0742.
^ No Transmission Fluid Pressure (TFP) manual valve position switch DTC P1810.
^ No TCC PWM solenoid valve DTC P1860.
^ The engine run time is greater than 5 seconds.
^ The engine is not in fuel cut off.
^ The TFP manual valve position switch indicates D4.
^ The transmission gear ratio indicates 2nd, 3rd, or 4th gear.
^ The transmission fluid temperature is -18-130°C (0-266°F).
^ The throttle angle is greater than 8 degrees.
^ Delivered torque is between 43-202 N.m (32-150 lb ft).
^ The TCC solenoid valve is commanded ON at maximum duty cycle.

Conditions for Setting the DTC

TCC slip speed exceeds its limit for a given torque for 5 seconds.

Torque (lb ft) Slip Speed Limit (RPM)

32 72
64 88
96 200
128 248
160 256

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.
^ SERVICE ENGINE SOON, SERVICE TRANSMISSION displays on the driver information center (DIC).
^ The PCM inhibits TCC engagement.
^ The PCM inhibits 4th gear if the transmission is in hot mode.
^ 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 clears the DTC from PCM history.
^ 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 fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM.

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.