DTC P0126:00, P0128:00: Notes
DTC DETECTING CONDITION REFERENCE CHART
| DTC P0126:00 |
Thermostat stuck open |
| DTC P0128:00 |
| DETECTION CONDITION |
P0126:00
- If the ECT signal never exceeds threshold (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: above 10 km/h {6.2 mph}
- Absolute load: above 14 %
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: above 40 km/h {24.8 mph}
Diagnostic support note
- This is an intermittent monitor (engine cooling 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 (Mode 2)/Snapshot data is available.
- The DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- Thermostat malfunction
- ECT sensor malfunction
- Cooling system malfunction
- PCM malfunction
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