Fuel Gauge Inaccurate

NOTE: After making any repairs, perform BODY VERIFICATION TEST under VERIFICATION TESTS.

NOTE: Diagnose and repair any fuel level DTCs before proceeding with this test.

With the DRBIII, read DTCs. If the DRBIII displays FUEL LEVEL SENSOR OPEN or FUEL LEVEL SENSOR SHORT, refer to symptom list for problems related to fuel level sensor DTCs. See SYMPTOM INDEX under SELF-DIAGNOSTIC SYSTEM. If the DRBIII does not display FUEL LEVEL SENSOR OPEN or FUEL LEVEL SENSOR SHORT, go to the next step.
Perform the instrument cluster self test. Depress and hold the trip odometer button while turning the ignition on. Observe the fuel gauge calibration points during the self test. The fuel gauge indicator needle should pause at the following positions. See FUEL GAUGE CALIBRATION POINTS table. Acceptable needle variation is approximately 2 degrees of calibration point. If the fuel gauge needle paused at the correct calibration points, go to the next step. If the fuel gauge needle did not pause at the correct calibration points, replace the instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION in appropriate ANALOG INSTRUMENT PANELS article.

With the DRBIII, select BODY, MIC, then SENSORS. Read the fuel tank level volts. Compare the volts displayed by the DRBIII to the fuel gauge using the values specified. See FUEL TANK LEVEL VOLTAGE SPECIFICATION . Voltage displayed should be within +/- 0.2 volts. If the displayed fuel tank level voltage is correct, the test is complete. If the displayed fuel tank level voltage is incorrect, replace the fuel level sensor.

FUEL TANK LEVEL VOLTAGE SPECIFICATION

Gauge	Specification
E	4.1-3.7 Volts (Approximately 109-167 Ohms Of Fuel Sensor Resistance)
1/8	3.6-3.3 Volts (Approximately 187-233 Ohms Of Fuel Sensor Resistance)
1/2	2.2 Volts (Approximately 530 Ohms Of Fuel Sensor Resistance)
3/4	1.7 Volts (Approximately 740 Ohms Of Fuel Sensor Resistance)
Full	1.4 Volts (Approximately 950 Ohms Of Fuel Sensor Resistance)