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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics - 1.8L - XE, GXE) >> 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 Sentra. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit wiring diagram, see Figure . For connector identification and locations, see CONNECTOR IDENTIFICATION  .

  1. Check Power Supply

    Turn ignition off. Disconnect ECT sensor harness connector. See Figure . Turn ignition on. Measure voltage between ground and ECT sensor harness connector terminal No. 1. See Figure . If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between ECT sensor and ECM. Perform DTC CONFIRMATION TEST  to verify repair.

  2. Check Ground Circuit

    Turn ignition off. Check continuity between engine ground and ECT sensor harness connector terminal No. 2. Continuity should exist. Also, check circuit for short to power. If problem is found, go to next step. If problem is not found, go to step  4 .

  3. Detect Malfunctioning Part

    Check the following:
    • Harness for open or short between ECT sensor and ECM.
    • Harness for open or short between ECT sensor and Transmission Control Module (TCM).
    • Joint connector No. 3.

    Repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair.

  4. Check ECT Sensor

    Check ECT sensor as shown in illustration. See Figure . If ECT sensor is okay, go to next step. If ECT sensor is not okay, replace ECT sensor. Perform DTC CONFIRMATION TEST  to verify repair.
  5. Allow Engine to cool until coolant temperature is less than 180°F (82°C). Start engine and grasp lower radiator hose. If coolant is flowing through lower radiator hose, repair or replace thermostat. Perform DTC CONFIRMATION TEST  to verify repair. If coolant is not flowing through lower radiator hose, go to next step.

  6. Check For Intermittent

    Check for intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. Perform DTC CONFIRMATION TEST  to verify repair.
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