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Home >> Mazda >> 1999 >> MX-5 Miata Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Tests >> Diagnostic Trouble Codes >> DTC P0462: Fuel Level Sensor Circuit High Input Or DTC P0463: 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. Go to next step.
  2. Inspect all applicable harness connectors. Repair as needed and go to step  8. If no problem is found, go to next step.
  3. Using scan tool, access PID/DATA MONITOR. Record PID data for FLT V. Compare reading with specification. See PIN VOLTAGE/PID VALUE CHARTS article. If data is not within specification, go to next step. If data is within specification, go to step  8.
  4. Turn ignition off. Disconnect PCM harness connector. Check continuity between terminal "C" on sending unit connector and terminal No. 3K on PCM harness connector. If continuity exists, go to next step. If continuity does not exist, repair Brown/Black wire and go to step  8.
  5. For DTC P0462, check continuity of Black wire between sending unit harness connector terminal "A" and ground. For DTC P0463, check continuity of Red/Blue wire between sending unit harness connector terminal "C" and main relay terminal "A". For all DTCs, if continuity exists, go to next step. If continuity does not exist, repair open circuit and go to step  8.
  6. Check continuity of sending unit. Ensure float arm is not bent. If sending unit is okay, go to next step. If any problems are found, replace sending unit and go to step  8.
  7. Erase DTC. See CLEARING CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION - MIATA & MILLENIA article. If DTC is present, replace PCM. If DTC is not present, intermittent poor harness connection may have caused DTC to originally set. Check wiring and connectors. Repair as necessary and go to next step.
  8. Erase DTC. See CLEARING CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION - MIATA & MILLENIA article. If any DTC is present, go to appropriate test. If DTC is not present, test is complete.
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