P0463
DTC P0463: Fuel Level Sensor Circuit High InputFuel Level Sensor Circuit Part 1:
Fuel Level Sensor Circuit Part 2:
CIRCUIT OPERATION
- The fuel level sensor output voltage is input in ECM (terminal No.97).
TECHNICAL DESCRIPTION
- Branch the output voltage from the fuel level sensor circuit, and input it into ECM.
- The ECM checks whether this voltage is within a specified range.
DESCRIPTIONS OF MONITOR METHODS
An open circuit is detected while monitoring the intake air temperature sensor output.
MONITOR EXECUTION
Continuous
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
- Not applicable
Sensor (The sensor below is determined to be normal)
- Not applicable
DTC SET CONDITIONS
Logic Flow Chart:
Logic Flow Chart
Check Conditions
- Battery positive voltage is between 11 and 16.5 volts.
- 2 seconds or more have passed since the engine staring sequence was completed.
Judgment Criterion
- Fuel level sensor output voltage has continued to be higher than 4.2 volt for 2 seconds.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23. OBD-II Drive Cycle Pattern Lists
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Fuel level sensor failed.
- Open or shorted fuel level sensor circuit, or connector damage.
- ECM failed.
DIAGNOSIS
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991911: Main Harness B
STEP 1. Check fuel gauge.
Q: Is the fuel gauge functioning?
YES: Go to Step 2.
NO: Refer to Chassis Electrical-Combination Meters Assembly and Vehicle Speed Sensor Equipment Diagnosis-Symptom Chart in Instrument Cluster/Carrier/Testing And Inspection/Diagnosis By Symptom - Symptom Chart
STEP 2. Check harness connector C-117 at ECM and harness connector D-10 at fuel level sensor (sub) for damage.
Q: Is the harness connector in good condition?
YES: Go to Step 3.
NO: Repair or replace them. Then go to Step 7.
STEP 3. Check for short circuit to ground between ECM connector C-117 (terminal No.95) and fuel level sensor (sub) connector D-10 (terminal No.2).
NOTE: Check harness after checking intermediate connectors C-122, C-113 and D-34. If intermediate connectors are damaged, repair or replace them. Then go to Step 7.
Q: Is the harness wire in good condition?
YES: Go to Step 4.
NO: Repair it. Then go to Step 7.
STEP 4. Check harness connector D-12 at fuel level sensor (main) for damage.
Q: Is the harness connector in good condition?
YES: Go to Step 5.
NO: Repair or replace them. Then go to Step 7.
STEP 5. Check for open circuit and short circuit to ground between fuel level sensor (main) connector D-12 (terminal No.2) and fuel level sensor (sub) connector D-10 (terminal No.2).
Q: Is the harness wire in good condition?
YES: Go to Step 6.
NO: Repair it. Then go to Step 7.
STEP 6. Check the trouble symptoms.
1. Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23. OBD-II Drive Cycle Pattern Lists
2. Check the diagnostic trouble code (DTC).
Q: Is DTC P0463 set?
YES: Replace the ECM. Then go to Step 7.
NO: It can be assumed that this malfunction is intermittent.
STEP 7. Test the OBD-II drive cycle.
1. Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23. OBD-II Drive Cycle Pattern Lists
2. Check the diagnostic trouble code (DTC).
Q: Is DTC P0463 set?
YES: Retry the troubleshooting.
NO: The inspection is complete.