2006 Mazda MPV ESFACTORY OEM SERVICE PROCEDURE

DTC P2188, P2190: Notes

DTC P2188, P2190 [AJ] DETECTION CONDITION AND POSSIBLE CAUSES

DTC P2188 Fuel system too rich at idle (Right bank)
DTC P2190 Fuel system too rich at idle (Left bank)
DETECTION CONDITION 
  • PCM monitors short term fuel trim (SHRTFT), long term fuel trim (LONGFT) during closed loop fuel control at idle. If the LONGFT and the sum total of these fuel trims exceed preprogrammed criteria, PCM determines that fuel system is too rich at idle.

Diagnostic support note 

  • This is a continuous monitor. (FUEL SYSTEM)
  • The MIL illuminates if the PCM detects the above malfunction condition 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.
  • DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • Misfire
  • HO2S (RF, LF) deterioration
  • HO2S heater (RF, LF) malfunction
  • MAF sensor malfunction
  • Pressure regulator (built-in fuel injection pump) malfunction
  • Fuel pump malfunction
  • EGR valve stuck open
  • IMCC improper operation
  • Purge solenoid valve improper operation
  • Purge solenoid valve malfunction (stuck open)
  • Purge solenoid hoses improper connection
  • PCV valve malfunction
  • PCM malfunction
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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.