Ford 2003 Mustang Workshop Manual page 3290

INDICATOR LAMP CONTROL III ACTIVE
COMMAND USING THE DIAGNOSTIC TOOL
Connect the diagnostic tool.
Enter the following diagnostic mode on the
diagnostic tool: Instrument Cluster Active
Command.
Select the instrument cluster INDICATOR
LAMP CONTROL III active command.
Trigger the CHECK FUEL CAP active
command ON. Observe the CHECK FUEL
CAP indicator.
Does the CHECK FUEL CAP indicator
illuminate?
N3 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 O: THE BRAKE WARNING INDICATOR IS
NEVER/ALWAYS ON
O1 CHECK IF THE GEM IS RECEIVING THE CORRECT
IGNITION SWITCH STATUS
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:
Generic Electronic Module (GEM) PID.
Monitor GEM PIDs IGN_KEY, IGN_S, IGN_R, and IGN_A
while cycling the ignition switch through all positions and
then removing the key from ignition switch.
Do the PIDs agree with the ignition switch status?
O2 DETERMINE IF GEM IS RECEIVING THE CORRECT
PARKING BRAKE INPUT
Monitor GEM PID PRK_BRK while applying and releasing
the parking brake.
Did the PID read ON with the parking brake applied, and
OFF with the parking brake released?
O3 DETERMINE IF BRAKE WARNING INDICATOR CIRCUIT IS
OPEN OR GROUNDED
Verify that the parking brake is released.
Is the instrument cluster BRAKE warning indicator off?
Test Step
Yes
REFER to the Powertrain
Control/Emissions Diagnosis (PC/ED)
manual.
No
GO to N3 .
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 O2
No
REFER to
Yes
GO to O3
No
GO to O5
Yes
GO to O4
.
Section 211-05 .
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