Ford 2003 Mustang Workshop Manual page 3566

Is the voltage greater than 9 volts?
I3 CHECK THE PATS TRANSCEIVER GROUND —
CIRCUIT 397 (BK/WH)
Key in OFF position.
Measure the resistance between PATS transceiver
C252 Pin 1, Circuit 397 (BK/WH), harness side and
ground.
Is the resistance less than 5 ohms?
I4 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT
FOR VOLTAGE — CIRCUIT 1216 (GY/OG)
Connect: PATS Transceiver C252.
Key in ON position.
Measure the voltage by back probing between PATS
transceiver C252 Pin 3, Circuit 1216 (GY/OG), harness
side and ground.
Is the voltage greater than 9 volts?
I5 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT
FOR SHORT TO GROUND — CIRCUIT 1216 (GY/OG)
Key in OFF position.
Disconnect: PATS Transceiver C252.
Measure the resistance between PATS transceiver
C252 Pin 3, Circuit 1216 (GY/OG), harness side and
ground.
Yes
GO to I4 .
No
REPAIR Circuit 397 (BK/WH).
REPEAT the self-test. CLEAR
the DTCs.
Yes
GO to I6 .
No
GO to I5 .
Yes
GO to I6 .
No
CHECK Circuit 1216 (GY/OG) for
short to ground. If the circuit is
OK, INSTALL a new instrument