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Home >> Mazda >> 2000 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0462: Fuel Level Sensor Circuit Low Input >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check service bulletins. Go to next step.
  2. Turn ignition on. Using scan tool, access PID/DATA MONITOR. Record PID data for FTL V. If FTL V PID is .1 volt or less, go to next step. If FTP V PID is more than .1 volt, problem is intermittent (not current).
  3. Turn ignition off. Disconnect sending unit harness connector. Check terminals for poor contact or corrosion. If no problem is found, go to next step. If problem is found, repair as needed. go to step  7.
  4. Ensure sending unit harness connector is disconnected. Using scan tool, access PID/DATA MONITOR. Record PID data for FTL V. If FTL V PID is 4.9 volts or less, go to next step. If FTP V PID is more than 4.9 volt, repair or replace sending unit. After repair, go to step  7.
  5. Check continuity of Red/Blue wire between sending unit harness connector terminal "C" and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground and go to step  7.
  6. Check continuity between sending unit harness connector terminals "A" (Black wire) and "C" (Red/Blue wire). If continuity is not present, go to next step. If continuity is present, replace sending unit and go to next step.
  7. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Turn ignition on. If DTC is not pending, go to next step. If DTC is pending, replace PCM. After repair, go to next step.
  8. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. If any DTC is present, go to appropriate test. If DTC is not present, test is complete.
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