P2068

Component Location





General Description

The Fuel Level Sensor(FLS) measures the fuel level in fuel tank and its information is used to supply the ECM with information regarding the monitoring condition of the EVAP canister purge system for leak detection. If the fuel level sensor is monitored for high or low stuck or difference between voltage of fuel level sensor and voltage deviation of fuel level sensor is exceeds limited value while driving, this is interpreted by the ECM as a fault

DTC Description

Checking output signals of fuel level sender under detecting condition, if the fuel level is too high, ECM sets P2068. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram

Signal Waveform & Data








Fig 1) Normal data of Fuel Level at idle (41%).
Fig 2) Abnormal data of Fuel Level when fuel level sensor circuit open or short.

Monitor Scantool Data

1. Connect scantool to Data Link Connector(DLC).
2. IG "ON".
3. Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.
4. Read "DTC Status" parameter.




5. Is parameter displayed "Present fault"?






Terminal and Connector inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Signal Circuit Inspection

Check short to battery in harness
1. IG "OFF" and disconnect Instrument cluster connector, Fuel Sender A & Fuel Pump Motor connector, and Fuel Sub Sender connector.
2. IG "ON".
3. Measure voltage between total signal terminal of Fuel Sub Sender harness connector and chassis ground.
4. Measure voltage between middle signal terminal of Fuel Sender A & Fuel Pump Motor harness connector and chassis ground.

Specification :Approx. 0V


5. Is the measured voltage within specification ?






Ground Circuit Inspection

Check open in harness
1. IG "OFF" and disconnect Instrument cluster connector and Fuel Sender A & Fuel Pump Motor connector.
2. Measure resistance between ground terminal of Fuel Sender harness connector and Fuel ground terminal of Instrument cluster harness connector.

Specification :Below 1Ohms


3. Is the measured resistance within specification ?






Component Inspection

Check FLS resistance
1. IG "OFF" and Disconnect Fuel Sender & Fuel Pump Motor connector and Fuel Sub Sender connector.
2. Remove these senders from fuel tank and measure the resistance of Fuel sender while lifting up and down the fuel level float.
3. Does the resistance of FLS change as lifting up and down the fuel level float ?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "DTC" button.
2. Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History(Not Present) fault"?