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Home › Mazda › 2002 › MX-5 Miata Base, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0106: BARO Circuit 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  7. If repair information is not available, go to next step.
  2. Identify DTC recorded in monitored FREEZE FRAME DATA screen. If DTC P0106 appears in FREEZE FRAME DATA screen, go to next step. If different DTC than P0106 appears in FREEZE FRAME DATA screen, follow appropriate DTC diagnostic procedure.
  3. Turn ignition off. Inspect EGR boost sensing related vacuum hoses for loose, damage, improper connection and/or leakage as follow:
    • From EGR boost sensor to EGR sensor boost sensor solenoid.
    • From EGR sensor boost sensor solenoid to EGR pipe.

    If related vacuum hoses are okay, go to next step. If related vacuum hoses are faulty, replace or repair as necessary. After repair, go to step  7.

  4. Inspect EGR boost sensor solenoid air filter for clogging. If EGR boost sensor solenoid air filter is okay, go to next step. If EGR boost sensor solenoid air filter is clogged, repair or replace as necessary and go to step  7.
  5. Inspect EGR boost sensor solenoid for being stuck open or close. See EGR BOOST SENSOR SOLENOID VALVE under EXHAUST RECIRCULATION SYSTEM in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. If EGR boost sensor solenoid is okay, go to next step. If EGR boost sensor solenoid is faulty, replace EGR boost sensor solenoid. After repair, go to step  7.
  6. Inspect EGR boost sensor. See EGR BOOST SENSOR-MIATA under EXHAUST RECIRCULATION SYSTEM in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. If EGR boost sensor is okay, go to next step. If EGR boost sensor is faulty, replace EGR boost sensor. 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 run drive mode 1, 2 and 3. See DRIVE MODES  under SELF-DIAGNOSTIC SYSTEM. After performed drive modes, monitor for DTCs. If same DTC P0106 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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