DTC P0741 - TCC System Stuck Off
Circuit Description
The torque converter clutch (TCC) solenoid is used to apply and release TCC. The TCC can be applied in all forward gears. The powertrain control module (PCM) controls TCC by pulse width modulating an internal driver that pulls solenoid circuit to ground. When the TCC solenoid is commanded ON, circuit grounded, TCC is applied, which works opposite to all other four transaxle solenoids. The TCC solenoid circuit is monitored for low and high voltage faults. The PCM uses the crankshaft position sensor (CKP) and input speed sensor (ISS) to calculate RPM slip acros torque converter. The PCM will use this information to determine torque converter clutch (TCC) slip. DTC P0741 sets when the TCC solenoid is commanded ON and engine speed does not equal input shaft speed, indicating TCC slip.
DTC Parameters
DTC P0741 will set if speed difference across torque converter is greater than 280 RPM, indicating TCC stuck OFF when:
| • | The TCC has been commanded ON for longer than 5 seconds with no gear change. |
| • | The condition exists longer than 7.5 seconds (2001)*. |
| • | The condition exists for longer than 7.5 seconds, 1 minute is allowed to elapse, then condition exists again for longer than 7.5 seconds (2000). |
| • | The engine speed is greater than 908 RPM. |
| • | The input speed is greater than 224 RPM. |
| • | The ECT is greater than 50°C (122°F). |
| • | The TFT is greater than 20°C (68°F). |
| • | The speed noise parameter = NO. |
| • | DTCs P0336, P0716 or P0717 have not been set. |
DTC P0741 diagnostic runs continuously when the above conditions have been met.
DTC P0741 is a type A DTC for 2000, type B for 2001.*
*Applicable to vehicles built after June 2000.
Diagnostic Aids
Important: If DTCs P0740, P0743, P0745, P0756, P0758, P0761, P0763, P0766, P0768 or P0789 is set, diagnose that DTC first. A diagnosed TCC solenoid circuit, shift solenoid circuit or low main line pressure DTC may have caused DTC P0741 to set.
Refer to Part Description for component location and description.
Make sure TCC solenoid is not intermittently sticking. Audible sound should be similar for all solenoids. A muffled tone indicates the need for replacement.
An intermittent open anywhere in the circuit or short to voltage on circuit 422 will cause no TCC. Use Scan tool to command TCC SOLENOID ON (PWM) by performing SOLENOID AUDIBLE CHECK. Wiggling wires while performing test may locate a problem.
The TCC will not apply if clutch priority valve is moving to make a shift due to 2nd, 3rd or 4th gear stuck On. DTC P0741 will be set.
The TCC solenoid resistance: 3.8-7.2 ohms
Nominal value: 4.5 ohms at 68°F
