DTC Detection Logic
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.
P0128 THERMOSTAT FUNCTION - DTC DESCRIPTION
| DTC | M.U.T.-III SE screen terms (Trouble diagnosis content) | DTC detection condition | ||
|---|---|---|---|---|
| P0128 | 00 | THERMSTAT FNCTN [Coolant thermostat (coolant temperature below thermostat regulating temperature)] |
Diagnosis condition | - |
| Signal (terminal) | Engine coolant temperature sensor signal | |||
| Threshold | The engine coolant temperature does not reach to specified temperature even though the engine has run long enough. | |||
| Diagnosis delay time | - | |||