Ford 2003 Mustang Workshop Manual page 3283

PINPOINT TEST F: INCORRECT TACHOMETER INDICATION
Test Step
F1 CHECK THE TACHOMETER
OPERATION
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 TCHOMETER. Scroll to 0%,
50%, and 100%.
Did the tachometer display read 0 at
0%, half the tachometer display at
50%, and the full tachometer display
at 100%?
F2 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 G: INCORRECT BOOST GAUGE INDICATION—
COBRA ONLY
Test Step
G1 CHECK BOOST GAUGE
PRESSURE LINE
Disconnect the boost gauge
pressure line from the intake
manifold.
Apply 69 kPa (10 psi) to the boost
gauge pressure line.
Does the boost gauge indicate
maximum boost pressure?
G2 CHECK THE BOOST GAUGE
Disconnect the boost gauge
pressure line from the instrument
cluster.
Apply 10 psi to the boost gauge.
Does the boost gauge indicate
maximum boost pressure?
Result / Action to Take
Yes
REFER to the Powertrain Control/Emissions
Diagnosis (PC/ED) manual.
No
GO to F2 .
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.
Result / Action to Take
Yes
CHECK for a plugged manifold fitting. TEST the
system for normal operation.
No
GO to G2 .
Yes
INSTALL a new boost gauge pressure line. TEST the
system for normal operation.
No
INSTALL a new instrument cluster. REFER to
REPEAT the self-test.
in this section. TEST the