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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 P0107: Barometric Pressure Circuit Low 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 less than .21 volts, go to next step. If voltage is .21 volts or more, problem is intermittent (not current).
  3. Disconnect EGR boost sensor harness connector. Turn ignition on. Record PID data for BARO V. If voltage is more than 4.8 volts, go to next step. If voltage is 4.8 volts or less, go to step  5.
    NOTE: If DTC P0122 and P0452 are present, check reference voltage. See REFERENCE VOLTAGE TEST .
  4. Turn ignition on. Check voltage at harness connector terminal "C" (Light Green/Red wire). If 4.5-5.5 volts are present, check connector. If connector is okay, replace EGR boost sensor. If connector is bent or corroded, repair connector. After repair, go to step  7. If 4.5-5.5 volts are not present, repair open circuit in Light Green/Red wire between EGR boost sensor and PCM connector No. 2 terminal "I". Go to step  7.
  5. Turn ignition off. Disconnect PCM connectors. Check continuity between EGR boost sensor harness connector terminal "B" (Gray wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground. Go to step  7.
  6. Check continuity between harness connector terminals "A" (Black/Red wire) and "B" (Gray wire). If continuity is not present, go to next step. If continuity is present, repair short between circuits. Go to next step.
  7. 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 should 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.
  8. 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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