Circuit Description
The torque converter clutch (TCC) solenoid is a pulse width modulated solenoid.
When vehicle operating conditions are met for TCC application, the PCM begins the
duty cycle at approximately 42%. The PCM then increases the duty cycle up to 90% in
order to achieve full TCC apply. When the TCC solenoid 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 PCM detects a high TCC slip speed with the TCC solenoid commanded
On, DTC P0741 sets.
Conditions for Setting the DTC
DTC P0741 will set if TCC Slip Speed is greater than 200 RPM when:
| • | Condition exist for longer than 6 seconds |
| • | TP Angle is greater than 8% |
| • | Trans. Fluid Temp. is between 21 and 130°C (68 and 266°F) |
| • | Commanded Gear is greater than 1st |
| • | Time since the last gear selector change is greater than 6 seconds |
| • | No TP Angle DTCs have set |
| • | No engine torque default |
DTC P0741 is a type B DTC.
Diagnostic Aids
Inspect and repair as necessary:
| • | TCC solenoid O-ring for leaks or cut. |
| • | TCC solenoid filter plugged. |
| • | TCC control valve stuck in the released position. |
| • | TCC regulated apply valve stuck in the released position. |
| • | TCC feed limit valve stuck. |
| • | Pressure regulator valve stuck. |
| • | TCC fluid circuit leaks. |
| • | Turbine shaft seals for leaks or cut. |
| • | Torque converter for ballooning. |
