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Home >> Mazda >> 2003 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0108: BARO Circuit High Input >> Diagnostic Procedure

Diagnostic Procedure

  1. Verify Related Repair Information Availability -  Turn ignition off. Connect scan tool to DLC-2. See Figure. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  8.
  2. Inspect Connection Of EGR Boost Sensor Connector -  Turn ignition off. Verify EGR boost sensor 3-pin harness connector is securely connected. If proper connection is found, go to next step. If connector is not connected properly, reconnect and secure EGR boost sensor connector. After repair, go to step  8.
  3. Inspect EGR Boost Sensor Connector For Poor Connection -  Disconnect EGR boost 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. After repair, go to step  8.
  4. Inspect EGR Boost Sensor GND Circuit For Open Circuit -  Check continuity between ground and EGR boost sensor 3-pin harness connector terminal "A" (Black/Red wire). If continuity is found, go to next step. If continuity is not found, repair open circuit in Black/Red wire between EGR boost sensor 3-pin harness connector and PCM 31-pin harness connector terminal "4O". See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  8.
  5. Check PCM Connector -  Disconnect PCM 31-pin harness connector. See Figure. Check for poor connection at terminal "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. After repair, go to step  8
  6. Inspect EGR Boost Sensor Signal Circuit For Short To Reference Voltage Circuit -  Check for continuity between EGR boost sensor 3-pin harness connector terminals "B" (Blue/Yellow wire) and "C" (Light Green/Red wire). If continuity is not present, go to next step. If continuity is present, repair short between EGR boost sensor circuits (Blue/Yellow and Light Green/Red wires). After repair, go to step  8.
  7. Inspect EGR Boost Sensor Signal Circuit For Open Circuit -  Check for continuity in Blue/Yellow wire between EGR boost sensor 3-pin harness connector terminal "B" and PCM 31-pin harness connector terminal " 4AE". If continuity is present, go to next step. If continuity is not present, repair open circuit in Blue/Yellow wire between EGR boost sensor 3-pin harness connector terminal "B" and PCM 31-pin harness connector terminal " 4AE". After repair, go to next step.
  8. Verify Troubleshooting Of DTC P0108 Completed -  Return vehicle to original condition. Using NGS tester or equivalent, clear DTCs from PCM memory. Start engine and let idle until normal operating temperature is reached. Monitor for DTCs. If same DTC is not present, go to next step. If same DTC P0108 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step.
  9. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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