172 KENR9126
Troubleshooting Section
Results:
•
OK – The connectors and the wiring appear to be
OK. Proceed to Test Step 2.
•
Not OK – There is a problem in the connectors
and/or the wiring.
Repair: Repair the circuit. Verify that the repair
eliminates the problem.
STOP.
Test Step 2.
Confirm the Fuel Level in the
Tank
A. Visually check the fuel level in the tank.
B. Compare the fuel level in the tank to the indicator
on the fuel level sensor.
Expected Result:
The fuel l
evel in the tank agrees with the indicator
on the fuel level sensor.
Results
:
•
OK – The fuel level in the tank agrees with the
indicat
or on the fuel level sensor. Proceed to Test
Step 3.
•
Not OK –
The indicator on the fuel level sensor
does not reflect the actual fuel level in the tank.
Repai
r: Replace the fuel level sensor. Verify that
the repair eliminates the problem.
STOP.
Test Step 3. C heck the Status of the Fuel
Level
A. Remove the electrical power from the ECM.
B. Conn
ect the electronic service tool to the service
tool connector.
C. Res
tore the electric al power to the ECM.
D. Observe the status of “Fuel Gauge” on the
ele
ctronic service tool.
Note: The “Fuel Gauge” on the electronic service tool
re
presents the percentage of fuel level in the tank.
E. Remove the electrical power from the E CM.
Expected Result:
T
he status of “Fuel Gauge” displays the correct fuel
level.
Results:
•
OK – The electronic service tool displays the
correct fuel level.
Repair: The fuel level sensor appears to be
operating correctly at this time. There may be
an intermitt
ent problem in the harness or in a
connector. Refer to the diagnostic functional test
Troubleshooting, “Electrical Connectors - Inspect”.
STOP.
•
Not OK – The e
lectronic service tool does not
display the correct fuel level. Proceed to Test Step
4.
Test Step 4. C heck the Sensor's
Resistance at the S ensor
A. Disconne
ct the fuel level sensor connector.
Note: Be sure to wiggle the harness during the
followin
g measurement in order to reveal an
intermittent condition.
B. Measure
the sensor's resistance between 1 (fuel
level) and 2 (sensor return).
The corr
ect resistance is 33 Ohms when the
indicator is on “F”. The correct resistance is 240
Ohms when the indicator is on “E”.
Expected Result:
The re
sistance measurement is between 33 Ohms
and 240 Ohms.
Resul
ts:
•
OK – The resistance of the sensor is between 33
Ohms
and 240 Ohms. Record the measurement.
Connect the fuel level sensor connector. The
sensor's resistance is OK. Proceed to Test Step 5.
•
Not OK – The resistance measurement is greater
than 240 Ohms or the resistance measurement is
les
s than 33 Ohms.
Repair: Perform the following procedure:
1. Disconnect the fuel level sensor from the
vessel's wiring. Verify that the fuel level sensor
is
operating correctly. Refer to the literature that
is provided by the OEM for the sensor.
2. If
the sensor is causing the high resistance,
adjust the sensor, when possible. Replace the
sensor , if necessary.
STOP.
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