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Home >> Mazda >> 2000 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0463: Fuel Level Sensor Circuit High Input >> Diagnosis & Repair Procedure

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 FLT V. If data is more than 5.4 volts, go to next step. If data is 5.4 volts or less, problem is intermittent (not current).
  3. Turn ignition off. Disconnect sending unit connector. Inspect harness connector terminals. If no problem is found, go to next step. If problem is found, repair as needed. Go to step  8.
  4. Turn ignition on. Connect a jumper wire between sending unit harness connector terminals "A" (Red wire) and "C" (Red/Blue wire). Using scan tool, access PID/DATA MONITOR. Record PID data for FLT V. If data is more than .1 volt, go to next step. If data is .1 volts or less, replace sending unit and go to step  8.
  5. Check voltage between sending unit harness connector terminal "C" (Red/Blue wire) and ground. If voltage is less than 5 volts, go to next step. If voltage is 5 volts or more, go to step  7.
  6. Turn ignition off. Disconnect PCM connectors. Inspect harness connector terminals. If no problem is found, repair Red/Blue wire between PCM and sending unit. If problem is found, repair terminals. After all repairs, go to step  8.
  7. Turn ignition off. Check continuity between sending unit harness connector terminal "A" (Black wire) and ground. If continuity is present, go to next step. If continuity is not present, repair open in Black wire. Go to next step.
  8. Connect all connectors. Turn ignition on. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. If same DTC is not pending, go to next step. If same DTC is pending, replace PCM. Go to next step.
  9. 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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