P0462
DTC P0462: Fuel Level Sensor Circuit Low InputFuel Level Sensor Circuit Part 1:
Fuel Level Sensor Circuit Part 2:
CIRCUIT OPERATION
- The fuel level sensor output voltage is input in combination meter (terminal No. 13).
TECHNICAL DESCRIPTION
- The fuel level sensor converts the rest of the fuel to a voltage.
- The combination meter sends the data regarding the rest of the fuel to the PCM.
- The PCM checks whether this data is within a specified range.
DESCRIPTIONS OF MONITOR METHODS
A short circuit is detected while monitoring the fuel level 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.
Judgement Criterion
- Fuel level sensor output resistance has continued to be lower than 2 Ohms for 2 seconds.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 21. OBD-II Drive Cycle
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Fuel level sensor failed.
- Shorted fuel level sensor circuit or connector damage.
- PCM failed.
DIAGNOSIS
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A
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 - Symptom Chart.
STEP 2. Check harness connector B-19 at PCM and harness connector D-21 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 PCM connector B-19 (terminal No. 24) and fuel level sensor (sub) connector D-21 (terminal No. 1).
NOTE: Check harness after checking intermediate connectors C-32. If intermediate connectors are damaged, repair or replace them. Refer to Harness Connector Inspection. 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-19 at fuel level sensor (main) for damage.
Q: Is the harness connector in good condition?
YES: Go to Step 5.
NO: Repair or replace it. Then go to Step 7.
STEP 5. Check for short circuit to ground between fuel level sensor (main) connector D-19 (terminal No. 2) and fuel level sensor (sub) connector D-21 (terminal No. 1).
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 21. OBD-II Drive Cycle
2. Check the diagnostic trouble code (DTC).
Q: Is DTC P0462 set?
YES: Replace the PCM. When the PCM is replaced, register the encrypted code. Refer to Encrypted Code Registration Criteria Table. Then go to Step 7.
NO: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.
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 21. OBD-II Drive Cycle
2. Check the diagnostic trouble code (DTC).
Q: Is DTC P0462 set?
YES: Retry the troubleshooting.
NO: The inspection is complete.