LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Engine Controls Self-Diagnostics - Pathfinder & QX4) >> Diagnostic Tests >> DTC P0125: Insufficient Engine Coolant Temperature For Closed Loop Fuel Control >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Pathfinder and 2002 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove ECT sensor, and place in heated water. Measure resistance between ECT sensor terminals, with water at specified temperatures. See ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE  table. If resistance is not as specified, go to next step. If resistance is as specified, go to step  3 .
    ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE

    Temperature - °F (°C) (1) Ohms
    68 (20) 2100-2900
    122 (50) 680-1000
    194 (90) 236-260
    (1) Resistance should decrease as temperature increases. See Figure .
  2. Check following:
    • Check for poor, loose, corroded or damaged terminal connections in ECT sensor sub-harness connector.
    • Check for open or short in circuits between ECM and ECT sensor sub-harness connector. See WIRING DIAGRAMS article.
    If problem is found, repair as necessary.
  3. Allow engine to cool to less than 158°F (70°C). Start engine. Check coolant thermostat. If problem is found, repair as necessary. If no problem is found, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
scientia non olet · About LEMON Manuals