On Board Diagnosis Logic
NOTE:
If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303, P0304, P0305 or P0306, first perform the trouble diagnosis for DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306. Refer to
[P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE
].
Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long enough.
This is due to a leak in the seal or the thermostat being stuck open.
DTC DETECTING CONDITION AND POSSIBLE CAUSE
| DTC No. | Trouble diagnosis name | DTC detecting condition | Possible cause |
|---|---|---|---|
| P0128 0128 |
Thermostat function | The engine coolant temperature does not reach to specified temperature even though the engine has run long enough. |
|