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Home >> Nissan-Datsun >> 2002 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.5 >> Diagnostic Tests >> DTC P0128: Thermostat Function >> DTC Confirmation Test
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DTC Confirmation Test

NOTE: For best results, perform test with ambient temperature at 14°F (-10°C) or more and engine coolant temperature 14-140°F (-10-60°C).

Malfunction is detected when engine coolant temperature does not reach a specified temperature, even though engine has been running for a specified time. Possible causes are:

Replace thermostat using an OEM thermostat. Connect Scan tool to Data Link Connector (DLC). See Figure. Turn ignition on. Using scan tool, check engine coolant temperature. Ensure engine coolant temperature is less than 140°F (60°C). Drive vehicle at 50-75 MPH for 10 minutes. If a first trip DTC is detected, perform DIAGNOSTIC PROCEDURE .

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