PINPOINT TEST C: INCORRECT FUEL GAUGE INDICATION
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
B4
CHECK CIRCUIT 397 (BK/WH) FOR SHORT TO VOLTAGE
Measure the voltage between GEM C291 Pin 4, Circuit 397 (BK/WH), harness side and ground.
Is voltage present?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
No
REFER to
Section 418-00
.
CONDITIONS
DETAILS/RESULTS/ACTIONS
C1
CARRY OUT THE INSTRUMENT CLUSTER FUEL GAUGE ACTIVE COMMAND
NOTE:
Fuel fills of less than 9.5 liters (2.5 gallons) require at least 10 minutes to update the fuel gauge indication.
Select the HEC FUELLEVEL active command. Trigger, monitor, and scroll FUELLEVEL at: 0% , 50%, and
100%.
Does the fuel gauge display: below E at 0%, half at 50%, and F at 100%?
Yes
GO to
C2
.
No
INSTALL a new instrument cluster; REFER to
Instrument Cluster
. CLEAR the DTCs. REPEAT the self-test.
C2
CHECK THE FUEL GAUGE OPERATION
Fuel Pump Assembly C420
Connect one lead of Instrument Gauge System Tester to the fuel pump assembly C420 Pin 5, Circuit 29
(YE/WH), harness side and the other lead of Instrument Gauge System Tester to the fuel pump assembly
C420 Pin 8, Circuit 327 (BK/OG), harness side.
Set the Instrument Gauge System Tester to 160 ohms.
Turn the ignition switch to RUN for 1 second.
Page 12 of 32
1999 Mustang Workshop Manual
1/18/2013
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