Ford 2003 Mustang Workshop Manual page 3282

CAUTION: Use the correct probe adapter(s) when
making measurements. Failure to use the correct probe
adapter(s) may damage the connector.
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool:
Instrument Cluster Active Command.
Trigger the instrument cluster voltage gauge active command.
Scroll to 0%, 50%, and 100%.
Did the voltage gauge indicate L at 0%, the middle of the
gauge at 50%, and H at 100%?
E2 CHECK CHARGING SYSTEM
Check the charging system operation. REFER to
00 .
Is the charging system operating correctly?
E3 CHECK CIRCUIT 904 (LG/RD) FOR OPEN OR SHORT TO
GROUND
Key in OFF position.
Disconnect: Instrument Cluster C220a.
Disconnect: Generator C102a.
Measure resistance between the generator C102a pin 1, circuit
904 (LG/RD), harness side and the instrument cluster C220a pin
5, circuit 904 (LG/RD), harness side; and between the generator
C102a pin 1, circuit 904 (LG/RD), harness side and ground.
Is the resistance less than 5 ohms between the generator
and the instrument cluster; and greater than 10,000 ohms
between the generator and ground?
E4 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.
Operate the system and verify the concern is still present.
Is the concern still present?
Yes
GO to
No
GO to
Yes
Section 414-
GO to
No
REPAIR the charging
system as needed.
REFER to
00 .
Yes
The system is operating
correctly at this time.
No
REPAIR the circuit.
TEST the system for
normal operation.
Yes
INSTALL a new
instrument cluster.
REFER to
Cluster
TEST the system for
normal operation.
No
The system is operating
correctly at this time.
Concern may have
been caused by a loose
or corroded connector.
CLEAR the DTCs.
E2 .
E4 .
E3 .
Section 414-
Instrument
in this section.