DTC P0126, P0128: Notes
DTC P0126, P0128 DETECTION CONDITION 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 is started for a specified period, the PCM determines that the coolant thermostat is stuck open.
MONITORING CONDITIONS
- IAT: above -10°C {14°F}
- Vehicle speed: over 6.0 km/h {3.7 mph}
DTC P0128
- PCM monitors MAF, IAT, VSS and ECT signals and calculate radiator's heat the radiation ratio when the following monitoring conditions are met. If the calculated value exceeds the threshold, the 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 {18.6 mph}
Diagnostic support note
- This is an intermittent monitor (Engine cooling system).
- MIL illuminates if PCM detects 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 PCM detects the above malfunction condition during first drive cycle.
- FREEZE FRAME DATA is available.
- DTC is stored in PCM memory.
- DIAGNOSTIC MONITORING TEST RESULT is available.
|
| POSSIBLE CAUSE |
- ECT sensor malfunction
- Coolant thermostat malfunction
- PCM malfunction
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