Ford ST1137-A, Manual

Page: 21 / 43

413-01-21 413-01-21 Instrument Cluster
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST G: INCORRECT BOOST GAUGE INDICATION—COBRA ONLY
Test Step Result / Action to Take
G1 CHECK THE BOOST GAUGE PRESSURE LINE
• Disconnect the boost gauge pressure line from the intake
Yes
manifold. CHECK for a plugged manifold fitting.
• Apply 69 kPa (10 psi) to the boost gauge pressure line. TEST the system for normal operation.
• Does the boost gauge indicate maximum boost pressure?
No
GO to G2 .
G2 CHECK THE BOOST GAUGE
• Disconnect the boost gauge pressure line from the instrument
Yes
cluster. INSTALL a new boost gauge pressure
• Apply 10 psi to the boost gauge. line. TEST the system for normal
• Does the boost gauge indicate maximum boost pressure? operation.
No
INSTALL a new instrument cluster.
REFER to Instrument Cluster in this
section. TEST the system for normal
operation.
PINPOINT TEST H: THE LOW FUEL WARNING INDICATOR IS NEVER/ALWAYS ON
Test Step Result / Action to Take
H1 CARRY OUT THE INSTRUMENT CLUSTER WARNING LAMPS
AND CHIME ACTIVE COMMAND USING THE DIAGNOSTIC
TOOL
• Key in OFF position.
• Connect the scan tool.
• Key in ON position.
• Enter the following diagnostic mode on the scan tool: Instrument
Cluster Active Command.
Yes
• Select the instrument cluster WARNING LAMPS AND CHIME
GO to H2 .
active command. Trigger the ALL LAMPS active command.
Observe the LOW FUEL warning indicator.
No
• Is the LOW FUEL warning indicator illuminating? GO to H3 .
H2 THE LOW FUEL GAUGE WARNING INDICATOR IS
NEVER/ALWAYS ON
• Check the fuel gauge for correct operation.
Yes
• Is the fuel gauge operating correctly? GO to H3 .
No
GO to Pinpoint Test B .
H3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
• Disconnect all the instrument cluster connectors.
Yes
• Check for: INSTALL a new instrument cluster.
REFER to Instrument Cluster in this
• corrosion
section. TEST the system for normal
• pushed-out pins
operation.
• Connect all the instrument cluster connectors and make sure
they seat correctly.
No
• Operate the system and verify the concern is still present. The system is operating correctly at this
• Is the concern still present? time. The concern may have been caused
by a loose or corroded connector. CLEAR
the DTCs. REPEAT the self-test.
PINPOINT TEST I: THE SPEEDOMETER IS INOPERATIVE
Test Step Result / Action to Take
I1 TEST THE INSTRUMENT CLUSTER
• Carry out the instrument cluster self-diagnostic mode.
Yes
• Did the gauge sweep? REFER to the Powertrain
Control/Emissions Diagnosis (PC/ED)
manual .
No
GO to I2 .
(Continued)
2003 Mustang, 8/2002