P0461

P0461

Component Location:

General Description
The Fuel Level Sensor (FLS) measures the fuel level in fuel tank and its information is used to supply the PCM 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 PCM as a fault.

DTC Description
Checking fuel level change under detecting condition, if not only the fuel level difference between current and previous is lower than 0.035 but also odometer difference between present and previous is higher than 200 km, PCM sets P0451. MIL (Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

DTC Detecting Condition:

Specification:

Schematic Diagram (Part 1):

Schematic Diagram (Part 2):

Monitor Scantool Data
1. Ignition "OFF".
2. Connect Scantool and Engine "ON".
3. Monitor "FLS" parameter on Current Data.






4. Is the "FLS" parameter displayed correctly?

YES - Fault is intermittent caused by poor contact in sensor's and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

NO - Go to "Terminal and Connector Inspection" procedure.

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?

YES - Repair as necessary and go to "Verification of Vehicle Repair" procedure

NO - Go to "Signal Circuit Inspection" procedure.

Signal Circuit Inspection
1. IG "OFF" and disconnect FLS connector.
2. IG "ON" & ENG "OFF"
3. Measure voltage between terminal 3 of FLS harness connector and chassis ground.

Specification: Approx. 11.46 V






4. Is the measured voltage within specification?

YES - Go to "Ground Circuit Inspection" procedure.

NO - Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

Ground Circuit Inspection
1. IG "OFF"
2. Disconnect FLS & Instrument cluster connector.
3. Measure resistance between terminal 6 of FLS harness connector and chassis ground.

Specification: Approx. below 1 ohm






4. Is the measured resistance within specification?

YES - Go to "Component Circuit Inspection" procedure.

NO - Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

Component Inspection
1. Ignition "OFF"
2. Disconnect Fuel Level Sensor connector and Remove Fuel Sender from fuel tank.
3. Measure resistance between terminal 3 and 6 of Fuel Sender. (Component Side)






4. Does the resistance of FLS change as lifting up and down the fuel level float?

YES
- Substitute with a known - good PCM and check for proper operation.
- If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.

NO
- Substitute with a known - good Fuel Level Sensor and check for proper operation.
- If the problem is corrected, replace Fuel Level Sensor and go to "Verification of Vehicle Repair" procedure.

CAUTION: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM. Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others.

Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code (DTC) which has been diagnosed.
2. Using a Scantool, Clear the DTCs
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions
4. Monitor that all readiness test have been verified as "Complete"
5. Are any DTCs present?

YES - Go to the applicable troubleshooting procedure.

NO - System is performing to specification at this time.