P0463
DTC P0463 FUEL LEVEL SENSOR "A" CIRCUIT HIGH INPUTComponent Location:
GENERAL DESCRIPTION
The ECM/PCM uses the fuel level input in order to calculate the expected vapor pressure within the fuel system. The vapor pressure varies as the fuel level changes. The vapor pressure is critical in determining if the evaporative emission system is operating properly. The ECM/PCM also uses the fuel level in order to determine if the fuel level is too high or too low to be able to accurately detect evaporative system malfunctions.
DTC DESCRIPTION
If the signal voltage is over 4.0 V during 60 sec or more, ECM/PCM sets DTC P0463.
DTC Detecting Condition:
Specification:
Schematic Diagram (A/T):
Schematic Diagram (M/T):
MONITOR SCANTOOL DATA
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. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions noted in the DTC detecting condition.
5. Read "DTC Status" parameter.
6. Is parameter displayed "History (Not Present) fault"??
NOTE:
- History fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.
YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM/PCM's connector or was repaired and ECM/PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Go to "Terminal & Connector Inspection" procedure
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminal condition. 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 "Component inspection" procedure.
SIGNAL CIRCUIT INSPECTION
1. IG "OFF".
2. Disconnect Fuel Level Sensor connector.
3. IG "ON".
4. Measure the voltage between terminal 3 of Fuel Level Sensor harness connector and ground.
Specification : Approx. 11 V
5. Is the measured voltage within specification?
YES - Go to "Ground circuit inspection" procedure.
NO
- Repair Short to ground circuit and then go to "Verification of Vehicle Repair" procedure.
- In case of 0 V, repair Open in signal circuit and then go to "Verification of Vehicle Repair" procedure. In case of 12 V, repair Short to power in signal circuit and then go to"Verification of Vehicle Repair" procedure.
GROUND CIRCUIT INSPECTION
1. IG "OFF".
2. Disconnect Fuel Level Sensor connector.
3. IG "ON".
4. Measure the voltage between terminal 4 of Fuel Level Sensor harness connector and ground. (A)
Measure the voltage between terminal 1 and 4 of Fuel Level Sensor harness connector. (B)
Specification : "A" - "B" = Below 200 mV
5. Is the measured voltage within specification?
YES - Go to "Component inspection" procedure.
NO - Repair Open in ground circuit and then go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. IG "OFF".
2. Disconnect Fuel Level Sensor harness connector.
Specification:
3. Measure the resistance between terminal 1 and 3 of Fuel Level Sensor harness connector. (Component side) (Measure the resistance while changing the float position.)
1. Is the measured resistance within specification?
YES - Substitute with a known-good ECM/PCM and check for proper operation. If the problem is corrected, replace ECM/PCM and then 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 then go to "Verification of Vehicle Repair" procedure.
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. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present?
YES - Go to the applicable troubleshooting procedure.
NO - System is performing to specification at this time.