Fuel Gauge Inaccurate

Possible Causes:

• Fuel Level Sensor DTC Present
• Fuel Level Sensor
• Instrument Cluster

Testing

NOTE: Diagnose and repair any PCM Fuel Level DTCs before proceeding with this test.
1. With the DRBIII(R), read DTCs. Does the DRBIII(R) display any Fuel Level Sensor DTCs? If yes, refer to symptom list for problems related to Fuel Level Sensor DTCs. If no, go to next step.
2. Perform the Instrument Cluster Self Test. To perform the Instrument Cluster self test, depress and hold the Trip Odometer reset button while turning the ignition on. Observe the Fuel Gauge calibration points during the Self Test. The Fuel Gauge indicator needle should pause at each calibration point. See FUEL GAUGE SELF TEST  table. Did the Fuel Gauge needle pause at the correct calibration points? If yes, go to next step. If no, replace the Instrument Cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION in ANALOG INSTRUMENT PANELS - LIBERTY article. Perform BODY VERIFICATION TEST  .
NOTE: Fuel Tank Level Voltage should be within +/- 0.2 volts.
3. With the DRBIII(R), select Body, MIC, then Monitors. Read the Fuel Tank Level Volts. Compare the Fuel Tank Level Volts displayed by the DRBIII(R) to the Fuel Gauge using the following values. See FUEL TANK LEVEL VOLTS  table. Is the displayed Fuel Tank Level voltage correct? If yes, test is complete. If no, replace the Fuel Level Sensor. Perform BODY VERIFICATION TEST  .