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) drive signal is input in PCM (terminal No. 24)
TECHNICAL DESCRIPTION
- Branch the drive signal from the fuel level sensor circuit, and input it into PCM.
- The PCM detects the amount of fuel left in the fuel tank with this signal, 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)
- Not applicable
Sensor (The sensor is determined to be normal)
- Not applicable
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions, Judgement Criteria
- 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.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Fuel pump module or fuel level sensor failed
- Open or shorted fuel level sensor circuit, or connector damage
- PCM failed
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Procedure 6 - Other Monitor. OBD-II Drive Cycle Pattern Lists
DIAGNOSIS
Required Special Tools:
- MB991958: Scan tool (MUT-III Sub Assembly)
- MB991824: V.C.I
- MB991827: USB Cable
- MB991910: Main Harness A
STEP 1. Using scan tool MB991958, read the diagnostic trouble code (DTC).
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Read the DTC.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P2066 set?
YES: Go to Step 2.
NO: Go to Step 4.
STEP 2. Check fuel gauge.
Q: Is the fuel gauge functioning?
YES: Go to Step 3.
NO: Refer to Chassis Electrical - Combination Meters Assembly and Vehicle Speed Sensor - Symptom Chart.
STEP 3. Check the trouble symptoms.
1. Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Procedure 6 - Other Monitor. OBD-II Drive Cycle Pattern Lists
2. Check the diagnostic trouble code (DTC).
Q: Is DTC P0461 set?
YES: Replace the PCM. Then go to Step 10.
NO: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points.
STEP 4. Check harness connector B-20 at PCM and D-18 at fuel level sensor (main) for damage.
Q: Are the connectors in good condition?
YES: Go to Step 5.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 10.
STEP 5. Check for open circuit and short circuit to ground between PCM connector B-20 (terminal No. 24) and fuel level sensor (main) connector D-18 (terminal No. 2).
NOTE: Check harness after checking intermediate connector C-25 If intermediate connector is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 9
Q: Is the harness wire in good condition?
YES: Go to Step 6.
NO: Repair it. Then go to Step 10.
STEP 6. Check harness connector D-17 at fuel level sensor (sub) for damage.
Q: Is the connector in good condition?
YES: Go to Step 7.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 10
STEP 7. Check for open circuit between fuel level sensor (sub) connector D-17 (terminal No. 1) and fuel level. sensor (main) connector D-18 (terminal No. 2)
Q: Is the harness wire in good condition?
YES: Go to Step 8.
NO: Repair it. Then go to Step 10.
STEP 8. Check the fuel pump module.
Check to see if the fuel pump module is normal. Refer to Chasiss Electrical - Combination Meters Assembly and Vehicle Speed Sensor - On-Vehicle Service - Fuel Level Sensor Check.
Q: Is the fuel pump module normal?
YES: Go to Step 9.
NO: Replace the fuel pump module. Then go to Step 10.
STEP 9. Check the trouble symptoms.
1. Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Procedure 6 - Other Monitor. OBD-II Drive Cycle Pattern Lists
2. Check the diagnostic trouble code (DTC).
Q: Is DTC P0461 set?
YES: Replace the PCM. Then go to Step 10.
NO: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points.
STEP 10. 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 - Procedure 6 - Other Monitor. OBD-II Drive Cycle Pattern Lists
2. Check the diagnostic trouble code (DTC).
Q: Is DTC P0461 set?
YES: Retry the troubleshooting.
NO: The inspection is complete.