2006 Mazda MX-5 Miata BaseFACTORY OEM SERVICE PROCEDURE

DTC P0506: Notes

DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0506)

DTC P0506 Idle speed control system RPM lower than expected
DETECTION CONDITION 
  • Actual idle speed is lower than expected by 100 rpm  for 14 s,  when brake pedal is depressed (brake switch is on) and steering wheel is held straight ahead (power steering pressure (PSP) switch is off).
    NOTE:
    • If atmospheric pressure is less than 72.3 kPa {542 mmHg, 21.3 inHg}  or intake air temperature is below -10°C {14°F}  , the PCM cancels diagnosis of P0506.
Diagnostic support note 
  • This is a continuous monitor (CCM).
  • The MIL illuminates if the PCM detects the above malfunction conditions in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
  • PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
  • FREEZE FRAME DATA is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • Electronic throttle control system malfunction
  • Air cleaner element clogged
  • Air intake passage clogged
  • A/C relay control circuit malfunction
  • Generator malfunction
  • Purge solenoid valve malfunction
  • Low engine compression (Over capacity of blow-by gas)
  • PCM malfunction
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.