Ford 2003 Mustang Workshop Manual page 3302

Is the resistance less than 5 ohms?
V6 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?
PINPOINT TEST W: NO COMMUNICATION WITH THE GENERIC
ELECTRONIC MODULE (GEM)
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to
use the correct probe adapter(s) may damage the connector.
W1 CHECK THE GENERIC ELECTRONIC MODULE (GEM)
POWER SUPPLY
Key in OFF position.
Disconnect: Generic Electronic Module (GEM) C201a.
Disconnect: GEM C201b.
Key in ON position.
Using the following table, measure the voltage between the
GEM, harness side and ground.
Connector Pin
C201a 4
C201a 1
C201b 2
C201b 3
Are the voltages greater than 10 volts?
W2 CHECK THE GEM GROUND CIRCUIT 397 (BK/WH) FOR
Test Step
Circuit
400 (LB/BKK)
1006 (DG/WH)
1001 (WH/YE)
193 (YE/LG)
Yes
INSTALL a new instrument
cluster. REFER to
Instrument Cluster in this
section. 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. REPEAT the self-
test.
Result / Action to Take
Yes
GO to W2 .
No
REPAIR the circuit(s) in
question. TEST the system
for normal operation.