TCC in Drive Mode

The OSC function is used to test whether the torque converter clutch (TCC) is locking and unlocking correctly.

The OSC functions for the TCC parameter allow the technician to do the following:

• Command TCC solenoid ON (100% duty cycle) to lock the TCC
• Command TCC solenoid OFF (0% duty cycle) to unlock the TCC

The vehicle requirements must be met when sending the OSC command for TCC. If the vehicle requirements are not met when sending the OSC command, the command will be cancelled. If after sending the OSC command the vehicle requirements are no longer met, the OSC command will be cancelled.

The vehicle requirements for sending the OSC command for TCC are as follows:

• Engine is running
• Gear selector is in OVERDRIVE
• Vehicle speed is greater than 3 km/h (2 mph)
• Transmission fluid temperature (TFT) is between 16-116°C (60-240°F)
• Brake is off when vehicle speed is below 32 km/h (20 mph)
• Not an excessive load on the engine
• Not during an upshift or downshift
• Engine speed is greater than 1,500 RPM