Ford 2003 Mustang Workshop Manual page 3279

Is any voltage present?
B6 CHECK THE FUEL PUMP ASSEMBLY FEED CIRCUIT 29
(YE/WH)
Key in OFF position.
Measure the resistances between the instrument cluster C220b
pin 19, circuit 29 (YE/WH), harness side and the fuel pump
module C463 pin 5, circuit 29 (YE/WH), harness side; and
between the instrument cluster C220b pin 19, circuit 29 (YE/WH),
harness side and ground.
Is the resistance less than 5 ohms between the instrument
cluster and the fuel pump module and greater than 10,000
ohms between the instrument cluster and ground?
B7 CHECK FUEL PUMP MODULE GROUND CIRCUIT 327 (BK/OG)
AND CIRCUIT 397 (BK/WH)
Measure the resistance between the instrument cluster C220b
pin 20, circuit 397 (BK/WH), harness side and the fuel pump
module C463 pin 8, circuit 327 (BK/OG), harness side.
Is the resistance less than 5 ohms?
B8 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect all instrument cluster connectors.
Check for:
corrosion
pushed-out pins
Connect all instrument cluster connectors and make sure they
seat correctly.
Yes
GO to B7 .
No
REPAIR the circuit.
TEST the system for
normal operation.
Yes
GO to B8 .
No
REPAIR the circuit(s)
in question. TEST the
system for normal
operation.
Yes
INSTALL a new
instrument cluster.
REFER to Instrument
Cluster in this section.
TEST the system for