Ford 2003 Mustang Workshop Manual page 3298

CLUSTER SERVICE ENGINE SOON
INDICATOR ACTIVE COMMAND
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 active
command MIL.
Did the SERVICE ENGINE SOON
indicator illuminate?
S2 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 T: THE TURN/HAZARD INDICATOR IS
NEVER/ALWAYS ON
T1 CHECK THE TURN SIGNAL AND HAZARD LAMPS OPERATION
CAUTION: Use the correct probe adapter(s) when making
measurements. Failure to use the correct probe adapter(s) may
damage the connector.
Key in ON position.
Operate the left and right turn signals.
Operate the hazard lamps.
Do the turn signals and hazard lamps operate correctly?
T2 CHECK THE CIRCUIT IN QUESTION — CIRCUIT 2 (WH/LB) (RH)
OR CIRCUIT 3 (LG/WH) (LH)
Key in OFF position.
Disconnect: Instrument Cluster C220a (RH) or C220b (LH).
Key in ON position.
Measure the voltage between the instrument cluster C220a pin 3,
circuit 3 (LG/WH), harness side and ground, while the steering
column multifunction switch is placed in the left turn position (LH); or
between the instrument cluster C220b pin 3, circuit 2 (WH/LB),
harness side and ground, while the steering column multifunction
switch is placed in the right turn position (RH).
Yes
REFER to the Powertrain Control/Emissions
Diagnosis (PC/ED) manual.
No
GO to S2
Yes
INSTALL a new instrument cluster. REFER to
Instrument Cluster
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.
Test Step
.
in this section. TEST the
Result / Action to
Yes
GO to
No
REFER to
417-01
Yes
GO to
No
REPAIR the circuit
(s) in question.
TEST the system for
normal operation.
Take
T2 .
Section
.
T3 .