P0462
Fuel Gauge Unit Circuit:
Connectors:
DTC P0462: Fuel Level Sensor Circuit Low Input
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
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 Charts:
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 voltage has continued to be lower than 0.2 volt for 2 seconds.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Procedure 6 - Other Monitor.
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.
- PCM failed.
DIAGNOSIS
STEP 1. Check fuel gauge.
Q: Is the fuel gauge functioning?
YES: Go to Step 4.
NO: Go to Step 2.
STEP 2. Check harness connector C-122 at ECM
Q: Is the harness connector in good condition?
YES: Go to Step 3.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 7.
STEP 3. Check for short circuit to ground between fuel level sensor connector D-17 (terminal No. 2) and ECM connector C-122 (terminal No. 97)
NOTE: Check harness after checking intermediate connectors C-210 and C-25. 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: Refer to Chassis Electrical- Combination Meters Assembly and Vehicle Speed Sensor - Equipment Diagnosis - Trouble Symptom Chart.
NO: Repair it. Then go to Step 7.
STEP 4. Check harness connector C-122 at ECM
Q: IS the harness connector in good condition?
YES: Go to Step 5.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 7.
STEP 5. Check for open circuit between ECM connector C-122 (terminal No. 97)
NOTE: Check harness after checking intermediate connectors C-127 and D-14. 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 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 - Procedure 6 - Other Monitor.
2. Check the diagnostic trouble code (DTC).
Q: Is DTC P0462 set?
YES: Replace the ECM
NO: It can be assumed that this malfunction is intermittent. Refer to INTRODUCTION, 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 - Procedure 6 - Other Monitor.
2. Check the diagnostic trouble code (DTC).
Q: Is DTC P0462 set?
YES: Retry the troubleshooting.
NO: The inspection is complete.