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Home >> Mazda >> 2000 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0108: Barometric Pressure Circuit High Input >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check service bulletins. Go to next step.
  2. Connect scan tool. Start engine. Using scan tool, access PID/DATA MONITOR. Record PID data for BARO V. If voltage is more than 4.48 volts, go to next step. If voltage is 4.8 volts or less, problem is intermittent (not current).
  3. Disconnect EGR boost sensor harness connector. Check connector for poor contact or corrosion. If problem is present, repair as necessary and go to step  6. If connector is okay, check continuity between EGR boost sensor harness connector terminal No. "A" (Black/Red wire) and ground. If continuity is present, go to next step. If continuity is not present, check continuity of Black/Red wire between EGR boost sensor harness connector terminal No. "A" and PCM harness connector No. 3 terminal "F". If continuity is present, go to next step. If continuity is not present, repair open circuit in Black/Red wire. Go to step  6.
  4. Check PCM connector terminals for poor contact or corrosion. If problem is present, repair as necessary and go to step  6. If connector is okay, check continuity between EGR boost sensor harness connector terminals "B" (Gray wire) and "C" (Light Green/Red wire). If continuity is not present, go to next step. If continuity is present, repair short between circuits. After repair, go to step  6.
  5. Check continuity of Gray wire between EGR boost sensor harness connector terminal No. "B" and PCM harness connector No. 3 terminal "S". If continuity is present, go to next step. If continuity is not present, repair open circuit in Gray wire. Go to next step.
  6. Connect all connectors. Turn ignition on. Clear DTC from memory. Start engine. Using scan tool, access PID/DATA MONITOR. Record PID data for BARO V and IAT V. IAT V must be more than 50°F (10°C). BARO V should be .21-4.8 volts. Recheck for DTCs. If DTC is still present, replace PCM. If DTC is not present, go to next step.
  7. Clear DTC from memory. Recheck for DTCs. If any other DTC is still present, diagnose and repair DTC. If no DTCs are present, test is complete.
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