TCC - Drive Mode

This OSC function is used to test whether the torque converter clutch is LOCKING and UNLOCKING correctly.

The OSC functions for the TCC parameter allows the technician to choose the following:

• ON - Commands the TCC solenoid ON (100% duty cycle) to LOCK the torque converter clutch
• OFF - Commands the TCC solenoid OFF (0% duty cycle) to UNLOCK the torque converter clutch
• XXX - Cancels the OSC command for TCC and 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 SENDING the OSC value, if the vehicle requirements are no longer met, the ERROR MESSAGE will NOT appear, but the PCM will cancel the OSC value. 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 greater than 2 MPH

The vehicle requirements for SENDING the TCC value ON are as follows:

• Engine is RUNNING
• Gear selector is in OVERDRIVE
• Vehicle speed greater than 2 MPH
• Transmission Fluid Temperature (TFT) is between 60°F and 240°F
• Brake is OFF when vehicle is below 20 MPH
• Not an excessive load of the engine
• Not during an UPSHIFT or a DOWNSHIFT
• Engine speed is greater than 1500 RPM