DTC Detection Logic
NOTE:
If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303 or P0304, first perform the trouble diagnosis for P0300, P0301, P0302, P0303, P0304. Refer to DTC Description
.
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.
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DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
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P0128 |
THERMSTAT FNCTN [Coolant thermostat (coolant temperature below thermostat regulating temperature)] |
Diagnosis condition |
- |
|
Signal (terminal) |
- |
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Threshold |
The engine coolant temperature does not reach to specified temperature even though the engine has run long enough. |
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Diagnosis delay time |
- |
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