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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 629 (On-Board Diagnostic (Engine Control System MZI-3.7) (2 Of 5)) >> DTC P0116:00 [MZI-3.7] >> Notes

DTC P0116:00 [MZI-3.7]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION & POSSIBLE CAUSE

DTC P0116:00 CHT sensor circuit range/performance
DETECTION CONDITION 
  • P0116:00 indicates the engine coolant temperature rationality test has failed. This DTC indicates that the CHT value is higher than the calibrated value and could prevent 1 or more OBD monitors from completing. The PCM runs this logic after an engine off and a calibrated soak period (typically 6 hours).

    This soak period allows the IAT and the CHT to stabilize and not differ by more than a calibrated value. DTC P0116:00 is set when all of the following conditions are met:

    • The CHT at engine start exceeds the IAT at engine start by more than a calibrated value, typically 17 °C {63 °F} 
    • The CHT exceeds a calibrated value, typically 107 °C {225 °F}. 
    • The fuel system, heated oxygen and misfire monitors have not completed.
    • The calibrated time to set DTC P0116:00 has expired.
POSSIBLE CAUSE 
  • Cooling system malfunction
  • CHT sensor malfunction
  • PCM malfunction
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