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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 P0452: EVAP Control System Pressure Sensor Low 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  5. If repair information is not available, go to next step.
  2. Before proceeding with step 3), check retrieved DTCs. If DTCs P0107 and P0122 are also present with P0452, see REFERENCE VOLTAGE TEST  trouble shooting procedure. If no other DTCs is present, go to next step.
  3. Turn ignition off. Disconnect FTP sensor 3-pin harness connector. See Figure. Turn ignition on. Measure voltage between ground and FTP sensor harness connector terminal "C" (Light Green/Red wire). Voltage should be 4.5-5.5 volts. If voltage is not as specified, go to next step. If voltage is as specified, check for poor terminal connections, repair or replace if necessary. If connections are okay, replace FTP sensor. For circuit identification, see MIATA in WIRING DIAGRAMS article. After repair, go to step  5.
  4. Turn ignition off. Leave FTP sensor harness connector disconnected and disconnect PCM 31-pin harness connector. See Figure. Check continuity between ground and PCM harness connector terminal "4AB" (Red/Green wire). If continuity is found, repair short to ground (in Red/Green wire) between FTP sensor and PCM. After repair, go to next step. If continuity is not found, check FTP sensor ground and signal circuits for shorts, repair or replace as necessary and go to next step.
  5. 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 P0452 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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