| DETECTION CONDITION |
P0126:00
- If the ECT signal never exceeds specification (depend on minimum IAT) after engine start for specified period, the PCM determines that the thermostat is stuck open.
MONITORING CONDITIONS
- IAT: above -10 °C {14 °F}
- Vehicle speed: over 6.3 km/h {3.9 mph}
(MTX)/4.2 km/h {2.6 mph}
(ATX)
- Absolute load: above 10 %
P0128:00
- The PCM monitors MAF, IAT, VSS and ECT signals and calculate radiator's heat radiation ratio while following monitoring conditions are met. If calculated value exceeds threshold, the PCM determines that the thermostat is stuck open.
MONITORING CONDITIONS
- IAT: above -10 °C {14 °F}
- ECT at engine start: below 52 °C {126 °F}
- Vehicle speed: Vehicle driven 3 s or more
in total at vehicle speed of 20 km/h {12 mph} or more
- During malfunction determination, the vehicle speed of 20 km/h {12 mph} or less
is not continued for 90 s or more
.
Diagnostic support note
- This is an intermittent monitor (engine cooling system).
- The check engine light 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 first drive cycle.
- FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
- The DTC is stored in the PCM memory.
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