Ford 2003 Mustang Workshop Manual page 2326

the engine is ON.
the transmission range selector lever is in O/D.
the vehicle speed is greater than 3.2 km/h (2 mph).
OSC "TCC ON" 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.
the engine is ON.
the transmission range selector lever is in O/D.
the vehicle speed is greater than 3.2 km/h (2 mph).
the transmission is in 2nd gear or higher.
the TFT is between 15 and 135°C (60 and 275°F).
the brake is not applied "OFF" below 32 km/h (20 mph).
(Not an excessive load on engine (engine lugging).
OSC Command Values
OFF - turns TCC OFF.
ON - turns TCC ON.
XXX - cancels OSC value sent.
SEND - sends the values to PCM.
Drive Mode Procedures for TCC
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 - TCC."
Select "ON" to turn solenoid ON.
Press "SEND" to send command ON.
Select "OFF" to turn solenoid OFF.
Press "SEND" to send command OFF.
Select "XXX" to cancel at any time.
Press "SEND."
EPC in DRIVE MODE
This OSC function is used to increase the EPC pressure while testing the transmission shift functions.
This OSC function can only increase the EPC pressure greater than what the PCM normally
commands. If an OSC value, such as (75) or (90) psi is sent, the upshifts and downshifts should
exhibit a firmer shift. Firmer shifts would indicate that the EPC pressure control is working at higher