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Home >> Mazda >> 2002 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0453: EVAP Control System Pressure Sensor High Input >> Diagnostic Procedure
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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  7. If repair information is not available, go to next step.
  2. Turn ignition off. Disconnect FTP sensor 3-pin harness connector. See Figure. Check for poor connection due to damaged, pulled-out pins, corrosion, etc. If connector terminals are okay, go to next step. If connector terminals are found faulty, repair or replace as necessary and go to step  7.
  3. With FTP sensor harness connector disconnected, check continuity between ground and FTP sensor harness connector terminal "B" (Black/Red wire). If continuity is found, go to next step. If continuity is not found, repair open circuit (in Black/Red wire) between FTP sensor and PCM. For circuit identification, see MIATA in WIRING DIAGRAMS article. After repair, go to step  7.
  4. With FTP sensor harness connector disconnected, check continuity between FTP sensor harness connector terminals "A" (Red/Green wire) and "C" (Light Green/Red wire). If continuity is not found, go to next step. If continuity is found, repair short circuit between FTP sensor harness wires (Red/Green wire and Light Green/Red wire). After repair, go to step  7.
  5. Leave FTP sensor harness connector disconnected and disconnect PCM 31-pin harness connector terminal. See Figure. Check for poor connection at "4L", "4AB" and "4O" due to damaged, pulled-out pins, corrosion, etc. If connector terminals are okay, go to next step. If connector terminals are found faulty, repair or replace as necessary and go to step  7.
  6. With FTP sensor and PCM harness connector disconnected, check continuity between FTP sensor harness connector terminal "A" and PCM harness connector terminal "4AB" (Red/Green wire). If continuity is found, go to next step. If continuity is not found, repair open circuit (in Red/Green wire wire) between FTP sensor and PCM. After repair, go to next step.
  7. 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 P0453 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.
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