Ford 2003 Mustang Workshop Manual page 3543

H1 CHECK DIAGNOSTIC TOOL PINS FOR DAMAGE
Inspect diagnostic tool pins.
Are the pins OK?
H2 CHECK DLC C251 FOR DAMAGE
Key in OFF position.
Inspect the DLC C251 pins for damage.
Are the pins OK?
H3 CHECK VOLTAGE TO DLC C251 PIN 16 — CIRCUIT 1047 (LG/RD)
Measure the voltage between DLC C251 Pin 16, Circuit 1047
(LG/RD), harness side and ground.
Is the voltage greater than 10 volts?
H4 CHECK THE DLC GROUND — CIRCUIT 1205 (BK) AND CIRCUIT
651 (BK/YE)
Measure the resistance between DLC C251 Pin 4, Circuit 1205
(BK), harness side and ground; and between DLC C251 Pin 5,
Circuit 651 (BK/YE), harness side and ground.
Yes
GO to H2 .
No
REPAIR diagnostic
tool pins. TEST the
system for normal
operation.
Yes
GO to H3 .
No
REPAIR DLC C251.
TEST the system for
normal operation.
Yes
GO to H4 .
No
REPAIR Circuit
1047 (LG/RD).
TEST the system for
normal operation.
Yes
CHECK diagnostic
tool. TEST the
system for normal
operation.
No
REPAIR the circuit
in question. TEST
the system for
normal operation.