DTC P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) -
WARNING: This page is about a different variant/trim than selected.
- DTC DETECTING CONDITION:
- Two consecutive driving cycles with malfunction
- TROUBLE SYMPTOM:
- Thermostat remains open.
CAUTION: After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >
DIAGNOSTIC PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK VEHICLE CONDITION. | Has engine operated at idle or has vehicle been driven with part of engine submerged under water? | In this case, it is not necessary to inspect DTC P0128. | Go to step 2. |
| 2 CHECK ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Inspect the relevant DTC using "List of Diagnostic Trouble Code (DTC)". < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > | Go to step 3. |
| 3 CHECK TIRE SIZE. | Are all four wheels same as the specified size? | Go to step 4 . | Replace tire. |
| 4 CHECK ENGINE COOLANT. | Are coolant level and mixture ratio of cooling water to antifreeze solution correct? | Go to step 5. | Replace engine coolant. < Ref. to REPLACEMENT . > |
5 CHECK RADIATOR FAN.
|
Does radiator fan continuously rotate for more than 3 minutes during idling? | Repair radiator fan circuit. < Ref. to RADIATOR MAIN FAN AND FAN MOTOR > and < Ref. to RADIATOR SUB FAN AND FAN MOTOR . > | Replace thermostat. < Ref. to THERMOSTAT . > |