P0461
DTC P0461: Fuel Level Sensor (main) Circuit Range/PerformanceFuel Level Sensor Circuit Part 1:
Fuel Level Sensor Circuit Part 2:
CIRCUIT OPERATION
- The fuel level sensor (main) output voltage is input in ECM (terminal No.95).
TECHNICAL DESCRIPTION
- Branch the output voltage from the fuel level sensor circuit, and input it into ECM.
- The ECM detects the amount of fuel left in the fuel tank with this voltage, and also controls the fuel level warning light.
DESCRIPTIONS OF MONITOR METHODS
Detect malfunction if change of fuel level sensor output voltage is small when sum of fuel injection is large.
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 Condition, Judgment Criterion
- When the fuel consumption calculated from the operation time of the injector amounts to 30 liters (7.9 gal), the diversity of the amount of fuel in tank calculated from the fuel level sensor is 2 liters (0.5 gal) or less.
OBD-II DRIVE CYCLE PATTERN
None.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Fuel level sensor failed.
- Harness damage or connector damage in fuel level sensor circuit.
- 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 for damage.
Q: Is the harness connector in good condition?
YES: Go to Step 3.
NO: Repair or replace it. Then go to Step 5.
STEP 3. Check for harness damage between ECM connector C-117 (terminal No.95) and fuel level sensor (main) connector D-12 (terminal No.2).
NOTE: Check harness after checking intermediate connectors C-122, C-113 and D-35. If intermediate connectors are damaged, repair or replace them. Then go to Step 5.
Q: Is the harness wire in good condition?
YES: Go to Step 4.
NO: Repair it. Then go to Step 5.
STEP 4. Check the trouble symptoms. Check that the fuel gauge operates correctly.
Q: Does the fuel gauge operate correctly?
YES: It can be assumed that this malfunction is intermittent.
NO: Replace the ECM. Then go to Step 5.
STEP 5. Check the trouble symptoms. Check that the fuel gauge operates correctly.
Q: Does the fuel gauge operate correctly?
YES: The inspection is complete.
NO: Retry the troubleshooting.