Ford 2003 Mustang Workshop Manual page 2598

Is the voltage greater than 10 volts?
C2 CHECK THE TCS
Measure the resistance between TCS Pin 3 (component
side), and TCS Pin 4 (component side), while depressing and
releasing the TCS.
Is the resistance less than 5 ohms with the TCS
depressed and greater than 10,000 ohms with the TCS
released?
C3 CHECK CIRCUIT 224 (TN/WH) FOR AN OPEN
Key in OFF position.
Disconnect: PCM C175.
Measure the resistance between TCS C279-4, Circuit 224
(TN/WH), harness side and PCM C175-29, Circuit 224
(TN/WH), harness side.
Is the resistance less than 5 ohms?
Yes
GO to C3 .
No
INSTALL a new TCS. Test
the system for normal
operation.
Yes
REFER to Powertrain
Control/Emissions
Diagnosis (PC/ED)
manual.
No
REPAIR the circuit. TEST
the system for normal
operation.