OSCTCC in DRIVE MODE:

This function is used to test whether the torque converter clutch is locking and unlocking correctly. The OSC functions for the TCC parameter allow the technician to choose the following:

• ON - Commands the TCC solenoid ON (100% duty cycle) to engage the converter clutch.
• OFF - Commands the TCC solenoid OFF (0% duty cycle) to disengage the converter clutch.
• XXX - Cancels the OSC for the 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 appears. 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 does not appear but the OSC value is canceled by the PCM (monitoring corresponding PID). The OSC value XXX may be sent anytime to cancel OSC.

The vehicle requirements for SENDING the OSCTCC value OFF is 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 OSCTCC value ON is as follows:

• engine is running
• gear selector is in DRIVE
• vehicle speed is greater than 3 km/h (2 mph)
• transmission fluid temperature (TFT) is between 16°C (60°F) and 116°C (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 then 1,500 rpm