Ford 2003 Mustang Workshop Manual page 2322

Repair all vehicle speed DTCs.
Make sure that the vehicle speed sensor and digital TR sensors are functional.
Select "Active Command Modes."
Select "Trans - Bench Mode or Trans - Drive Mode."
OSC — Transmission Bench Modes
The following Transmission Bench Modes may be used or required during diagnostics.
SSA, SSB and TCC in BENCH MODE
The BENCH MODE allows the technician to carry out electrical circuit checks on the following
components:
SSA - activates SSA OFF or ON.
SSB - activates SSB OFF or ON.
Transmission converter clutch (TCC) - activates TCC OFF or ON.
OSC "SSA, SSB, TCC" BENCH MODE operates ONLY when:
the digital TR sensor is operational and no digital TR sensor DTCs are present.
the vehicle speed input is operational and no VSS sensor DTCs are present.
the transmission range selector lever is in P.
the key is ON.
the engine is OFF.
OSC Command Values
OFF - turns solenoid OFF.
ON - turns solenoid ON.
XXX - cancels OSC value sent.
SEND - sends the values to PCM.
BENCH MODE Procedure for SSA, SSB and TCC
Follow operating instructions from the scan tool menu screen:
Select "Output State Control."
Select "Trans - Bench Mode."
Select "PIDs" to be monitored.
Monitor all selected PIDs during test.
Select "Parameters - SSA, SSB or 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.