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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R Spec V >> Repair and Diagnosis >> External Pages >> Different car >> Section 106 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0128: Thermostat Function >> DTC Confirmation Test

DTC Confirmation Test

WARNING: This page is about a different car, the 2003 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.
  1. Replace thermostat with new one. Use only a genuine NISSAN thermostat as a replacement. If an incorrect thermostat is used, the MIL may come on.
  2. Turn ignition on. Select COOLAN TEMP/S in DATA MONITOR mode with scan tool. Check that the COOLAN TEMP/S is above 140°F (60°C). If it is below 140°F (60°C), go to next step. If it is above 140°F (60°C), stop engine and cool down the engine to less than 140°F (60°C), then retest.
  3. Drive vehicle for 10 consecutive minutes at speeds of 50-75 MPH. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE  . If 1st trip DTC is not detected, system is okay at this time.
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