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Home >> Mazda >> 2002 >> MX-5 Miata LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0451: Fuel Tank Pressure Sensor Performance Problem >> Diagnostic Procedure

Diagnostic Procedure

  1. Turn ignition off. Connect New Generation Star (NGS) tester or equivalent to OBD-II Data Link Connector-2 (DLC-2). See Figure. Turn ignition on. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check for service bulletins and/or other line of repair information related to this DTC. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  8. If repair information is not available, go to next step.
  2. Leave ignition on. Monitor for other DTCs. If malfunction code recordedis P0442, go to next step. If malfunction codes recordedare P0443 and/or P1449, follow appropriate DTC diagnostic procedure.
  3. Turn ignition off. Remove PCSV and perform inspection. For inspection, see PURGE SOLENOID VALVE - AIRFLOW INSPECTION under FUEL EVAPORATIVE SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. If PCSV is okay, go to next step. If PCSV is faulty, replace PCSV. After repair, go to step  8.
  4. Remove CDCV and perform inspection. For inspection, see CANISTER DRAIN CUT VALVE (CDCV) - AIRFLOW INSPECTION under FUEL EVAPORATIVE SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. If CDCV is okay, inspect hoses from charcoal canister to CDCV for detached, incorrectly installed or cracked, repair or replace if necessary and go to next step. If CDCV is faulty, replace CDCV. After repair, go to step  8.
  5. Remove Charcoal Canister. Inspect for plugging, damage or pinhole leaks. For Charcoal Canister inspection, see CHARCOAL CANISTER under FUEL EVAPORATIVE SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. If Charcoal Canister is okay, go to next step. If Charcoal Canister is faulty, replace Charcoal Canisterand go to step  8.
  6. Inspect FTP sensor operation. See FUEL TANK PRESSURE (FTP) SENSOR under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. If FTP sensor is operating properly, go to next step. If FTP sensor is faulty, replace FTP sensor. After repair, go to step  8.
  7. Return vehicle to original condition. Run EVAP Monitor Repair Verification Drive Mode 4. See MODE 4 - EVAP SYSTEM REPAIR VERIFICATION DRIVE MODE  under DRIVE MODES. Stop vehicle and using NGS tester or equivalent access ON BOARD SYSTEM READINESS TEST to inspect Drive Mode completion status. If EVAPORATIVE PURGE SYSTEM has been monitored, go to next step. If EVAPORATIVE PURGE SYSTEM has not been monitored, ensure evaporative monitoring condition are under specification and repeat this test.
  8. Return vehicle to original condition. Using NGS tester or equivalent, clear DTCs from PCM memory. Start engine and let it idle until it reaches normal operation temperature. Monitor for DTCs. If same DTC P0451 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE in REMOVAL, OVERHAUL & INSTALLATION article. If any other DTC is present, follow appropriate DTC diagnostic procedure.
Fig 1: Identifying Fuel Tank Pressure Sensor and Powertrain Control Module Connector Terminals
G00140066Courtesy of MAZDA MOTORS CORP.
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