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 choose the following:

• ON - Commands TCC solenoid ON (100% duty cycle) to lock the TCC
• OFF - Commands TCC solenoid OFF (0% duty cycle) to unlock the TCC
• XXX - Cancels OSC for TCC (returns to normal operation)

The vehicle requirements must be met when sending the OSC value for TCC. If the vehicle requirements are not met when sending the OSC value, an error message will appear. When the error message is received, OSC is aborted and must be restarted. After the OSC value for TCC is sent, if the vehicle requirements are no longer met, the error message will not appear but the OSC value will be cancelled by the PCM (monitor corresponding PID). The OSC value XXX may be sent anytime to cancel OSC.

The vehicle requirements for sending the TCC value OFF are as follows:

• Engine is running
• Gear selector is in OVERDRIVE
• Vehicle speed is greater than 3 km/h (2 mph)

The vehicle requirements for sending the TCC value ON 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