 DTC DETECTION LOGIC
NOTE:
If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303 or P304, first perform the trouble diagnosis for DTC P0300, P0301, P0302, P0303, P0304. Refer to DTC Logic (GT-R certified NISSAN dealer).
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 stuck open. DTC No.
| Trouble diagnosis name
| DTC detecting condition
| Possible cause
| P0128
| Thermostat function
| The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.
| - Thermostat
- Leakage from sealing portion of thermostat
- Engine coolant temperature sensor
|
 DTC CONFIRMATION PROCEDURE
 1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following conducting the next test. - Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:- For best results, perform at ambient temperature of –10°C (14°F) or higher.
- For best results, perform at engine coolant temperature of –10°C (14°F) to 51°C (124°F).
- Before performing the following procedure, do not fill with the fuel.
>>GO TO 2.
 2.PERFORM DTC CONFIRMATION PROCEDURE
- Turn A/C switch OFF.
- Turn blower fan switch OFF.
- Turn ignition switch ON.
- Select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT-III.
- Check the indication of “COOLAN TEMP/S”.If it is below 51°C (124°F), go to the following step.If it is above 51°C (124°F), cool engine down to less than 51°C (124°F). Then go to next step.
- Start engine.
- Drive vehicle for 10 consecutive minutes under the following conditions.
VHCL SPEED SE
| More than 56 km/h (35 MPH)
|
■ CAUTION ■ Always drive vehicle at a safe speed
NOTE: If “COOLAN TEMP/S” increases to more than 70°C (158°F) with in 10 minutes, turn ignition switch OFF because the test result will be OK.
- Check 1st trip DTC.
Is 1st trip DTC detected?
YES >>Go to Diagnosis Procedure (GT-R certified NISSAN dealer). NO >>INSPECTION END
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