Mazda RX-8 Workshop Manual page 593

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2011 - RX-8 - Engine
DTC P0126 [13B-MSP]
DTC P0126 Insufficient coolant temperature for stable operation
DETECTION
CONDITION
POSSIBLE
CAUSE
Diagnostic procedure
The PCM monitors the ECT after the engine start for a certain period. If the
ECT never exceeds 71 °C {160 °F} when the following conditions are
met, the PCM determines that the coolant thermostat is stuck open.
MONITORING CONDITIONS
ECT at engine start: less than 51°C {123 °F}
Estimated ambient temperature: more than –10 °C {14
°F}
Diagnostic support note
This is a continuous monitor (thermostat).
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 (Mode 2/Mode 12) is available.
The DTC is stored in the PCM memory.
VSS malfunction
IAT sensor malfunction
ECT sensor malfunction
Coolant thermostat malfunction
PCM malfunction