Ford 2003 Mustang Workshop Manual page 3289

Test Step
M1 CHECK THE O/D OFF
INDICATOR OPERATION
Key in ON position.
Observe the O/D OFF indicator.
Is the O/D OFF indicator
always on?
M2 CHECK THE INSTRUMENT
CLUSTER
Key in OFF position.
Disconnect: Instrument Cluster
C220a.
Key in ON position.
Observe the O/D OFF indicator.
Did the indicator turn off?
M3 CHECK THE INSTRUMENT
CLUSTER OPERATION
Carry out the instrument cluster
self-diagnostic mode.
Did the O/D OFF indicator
illuminate?
M4 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 N: THE CHECK FUEL CAP INDICATOR IS NEVER
ON
Test Step
N1 RETREIVE AND RECORD DTCS FROM
CONTINUOUS AND ON-DEMAND SELF-TESTS—
PCM
NOTE: Once the check fuel cap indicator
does turn on, it does not turn off unless the
fuel cap has been correctly secured and the
vehicle has been driven for several minutes.
Use recorded PCM DTCs from the
continuous and on-demand self-test.
Are any DTCs recorded?
N2 CARRY OUT THE INSTRUMENT CLUSTER
Result / Action to Take
Yes
GO to M2 .
No
GO to M3 .
Yes
REFER to the Powertrain Control/Emissions Diagnosis
(PC/ED) manual.
No
GO to M4 .
Yes
REFER to the Powertrain Control/Emissions Diagnosis
(PC/ED) manual.
No
GO to M4 .
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
If PCM DTC P0457, REFER to the
Powertrain Control/Emissions Diagnosis
(PC/ED) manual.
No
GO to N2 .