Ford 2003 Mustang Workshop Manual page 3293

O12 DETERMINE IF THE GEM IS INTERNALLY GROUNDED
Key in OFF position.
Disconnect: GEM C201e.
Key in ON position.
Observe the BRAKE warning indicator.
Is BRAKE warning indicator always on?
O13 CHECK CIRCUIT 128 (VT/YE) FOR SHORT TO GROUND
BETWEEN GEM AND INSTRUMENT CLUSTER
Key in OFF position.
Disconnect: Instrument Cluster C220b.
Measure the resistance between the GEM C201e pin 13,
circuit 128 (VT/YE), harness side and ground.
Is resistance greater than 10,000 ohms?
O14 CHECK FOR CORRECT GEM OPERATION
Disconnect all GEM connectors.
Check for:
corrosion
pushed-out pins
Connect all GEM connectors and make sure they seat
correctly.
Operate the system and verify the concern is still present.
Is the concern still present?
O15 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 O13 .
No
GO to O14 .
Yes
GO to O15 .
No
REPAIR the circuit. TEST
the system for normal
operation.
Yes
INSTALL a new GEM.
REFER to Section 419-10
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.
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.
.