DTC P0126, P0128: Notes
DTC P0126, P0128 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0126
DTC P0128 |
Coolant thermostat stuck open |
| DETECTION CONDITION |
DTC P0126
- If the ECT signal never exceeds 71 °C {160 °F}
after engine start for specified period, PCM determines that the coolant thermostat is stuck open.
MONITORING CONDITIONS
- IAT: above -10 °C {14 °F}
- Vehicle speed: above 6 km/h {4 mph}
- Absolute load: above 15%
DTC P0128
- 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, PCM determines that the coolant thermostat is stuck open.
MONITORING CONDITIONS
- IAT: above -10°C {14 °F}
- ECT at engine start: Below 36 °C {97 °F}
- Difference between ECT at engine start and minimum IAT: Below 6 °C {10.8 °F}
- Vehicle speed: over 30 km/h {19 mph}
Diagnostic support note
- This is an intermittent monitor (Engine cooling system).
- 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.
- DTC is stored in PCM memory.
|
| POSSIBLE CAUSE |
- Coolant thermostat malfunction
- ECT sensor malfunction
- PCM malfunction
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