Ford 2003 Mustang Workshop Manual page 3538

G2 CHECK DLC C251 PINS 2 AND 10 FOR DAMAGE
Key in OFF position.
Inspect the DLC C251 pins for damage.
Are the pins OK?
G3 CHECK THE VEHICLE FOR THE ANTI-LOCK BRAKE
CONTROL MODULE
Check the vehicle for any version of the anti-lock brake
control module.
Is the vehicle equipped with any version of the anti-
lock brake control module (with or without traction
control)?
G4 CHECK CIRCUIT 914 (TN/OG) AND CIRCUIT 915
(PK/LB) FOR OPEN — ANTI-LOCK BRAKE CONTROL
MODULE C135 DISCONNECTED
Disconnect: Anti-Lock Brake Control Module C135.
Measure the resistance between anti-lock brake control
module C135 Pin 30, Circuit 914 (TN/OG), harness
side and DLC C251 Pin 2, Circuit 914 (TN/OG),
harness side.
Measure the resistance between anti-lock brake control
module C135 Pin 29, Circuit 915 (PK/LB), harness side
and DLC C251 Pin 10, Circuit 915 (PK/LB), harness
side.
Are the resistances less than 5 ohms?
G5 CHECK CIRCUIT 914 (TN/OG) AND CIRCUIT 915
Yes
GO to G3 .
No
REPAIR the DLC C251. TEST
the system for normal operation.
Yes
GO to G4 .
No
GO to G7 .
Yes
GO to G5 .
No
REPAIR the circuit(s) in question
between in-line C215 and DLC
C251. For additional information,
REFER to Communication
Circuit Wiring Repair . TEST the
system for normal operation.