Drive Test

OSC allows control of 3 transmission functions while driving on the road. Each transmission function has a unique set of vehicle operating requirements that the technician is required to meet before the PCM will allow OSC to operate.

• TCC_OSC - Commands the PCM to engage or disengage the TCC
• GEAR_OSC - Commands the PCM to change gears (upshift or down-shift) or remain in a gear
• HRSH_SFT - Commands a slightly higher hydraulic pressure during engagements and upshifts

The vehicle requirements must be met when sending an OSC value to control the specific functions stated above. If the vehicle requirements are not met when sending the OSC value, an error message may appear. When the error message appears, OSC is cancelled and should be restarted.

After sending the OSC value, if the vehicle requirements are no longer met, the error message will not appear but the OSC value will be cancelled by the PCM. Use the scan tool to monitor the PID that corresponds to each OSC function or component to determine if the PCM is using the OSC value or normal control.

OSC may be cancelled at any time, using the scan tool, to return the PCM to normal control for a specific OSC function or component. See instructions for specific scan tool.