Set Instrument Gauge System Tester to 15 ohms.
NOTE:
The fuel gauge should read E or below when carrying out this test step.
Wait 1 minute and read the fuel gauge.
Set Instrument Gauge System Tester to 160 ohms.
NOTE:
The fuel gauge should read F (full) or above when carrying out this test step.
Wait 1 minute and read the fuel gauge.
Does the fuel gauge operate correctly?
Yes
GO to
C3
.
No
GO to
C5
.
C3
CHECK THE FUEL TANK
Check the fuel tank for any damage or deformation.
Is the fuel tank OK?
Yes
GO to
C4
.
No
INSTALL a new fuel tank; REFER to
Section 310-01
. CLEAR the DTCs. REPEAT the self-test.
C4
CHECK THE FUEL PUMP ASSEMBLY
Check the fuel pump assembly in-tank mounting, float, float rod, wiring and connections for damage or
obstruction.
Is the fuel pump assembly and wiring OK?
Yes
INSTALL a new fuel sender. CLEAR the DTCs. REPEAT the self-test.
No
REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
C5
CHECK CIRCUIT 29 (YE/WH) FOR SHORT TO POWER
Instrument Cluster C251
Measure the voltage between the instrument cluster C251 Pin 19, Circuit 29 (YE/WH), harness side and
ground.
Is any voltage present?
Page 13 of 32
1999 Mustang Workshop Manual
1/18/2013
http://www.fordtechservice.dealerconnection.com/pubs/content/~WSXB/~MUS~LEN/20/...
