Ford 2003 Mustang Workshop Manual page 2325

the engine is ON.
the TCC is OFF.
the transmission range selector lever is in O/D.
the vehicle speed is greater than 3.2 km/h (2 mph).
OSC Command Values
1 - PCM selects 1st gear.
2 - PCM selects 2nd gear.
3 - PCM selects 3rd gear.
4 - PCM selects 4th gear.
XXX - cancels OSC value sent.
SEND - sends the values to PCM.
DRIVE MODE Procedure for GR_CM
Follow operating instructions from the scan tool menu screen.
Select "Output State Control."
Select "Trans - DRIVE MODE."
Select "PIDs" to be monitored.
Monitor all selected PIDs during test.
Select "Parameters - GR_CM."
Select Value "1-4."
Press "SEND" to send command.
Re-Select Value "1-4."
Press "SEND" to send command.
Select "XXX" to cancel at any time.
Press "SEND."
TCC in DRIVE MODE
This OSC function is used to test whether the torque converter clutch is engaging and disengaging
correctly.
The OSC functions for the TCC parameter allows the technician to choose the following:
TCC - activates TCC OFF and ON.
ON - turns TCC solenoid ON.
OFF - turns TCC solenoid OFF.
OSC "TCC OFF" DRIVE MODE operates ONLY when:
the digital TR sensor is operational and no digital TR sensor DTCs are present.
the vehicle speed sensor is operational and no VSS sensor DTCs are present.