P0464

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

The Fuel Level Noisy Signal Diagnostic monitors variations in Fuel Level and looks for erratic or irregular behavior. When the Fuel Level is determined to display unstable, the Fuel Level Sender is determined to be failed.
When the Fuel Level Sender fails, it may cause the Evaporative System Diagnostic to function improperly since it relies on Fuel Level in its leak detection algorithm. A failed Fuel Level Sender will also provide misleading Fuel Level information to the driver (in cases where the PCM drives the fuel gauge).
Checking output signals from FLS under detecting condition, if Difference between previous and current Fuel Level Signal is high than 0.8V , PCM sets P0464. MIL(Malfunction Indicatin Lamp) turns on when the malfunction lasts till cosecutive 2 driving cycle.

DTC DETECTING CONDITION









SPECIFICATION





SCHEMATIC DIAGRAM





MONITOR DTC STATUS

1. Connect scantool to Data Link Connector(DLC).
2. IG "ON".
3. Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F4(DTAL) to check DTC's information from the DTCs menu
4. Read "DTC Status" parameter.




5. Is parameter displayed "Present fault"?
YES
> Go to "Inspection & Repair" procedure.
NO
> Fault is intermittent, go to "Verification of vehicle Repair" 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 2 of FLS harness connector and chassis ground.

Specification : Approx. 11.46V





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 & PCM connector.
3. Measure resistance between terminal 3 of FLS harness connector and chassis ground

Specification : Approx. below 1Ohms





4. Is the measured resistance within specification ?
YES
> Go to "Component Crcuit 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 reistance between terminal 2 and 3 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.

NOTE:
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. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". 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"?
YES
> System performing to specification at this time. Clear the DTC
NO
> Go to the applicable troubleshooting procedure.