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Home >> Suzuki >> 2002 >> Esteem GL, 4D Sedan, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 1.6L >> Diagnostic Tests >> DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. If engine system check has been performed, go to next step. If engine system check has not been performed, go to A4: ENGINE SYSTEM CHECK  under SYSTEM TESTS.
  2. Check heater operation and coolant flow. If heater takes a long time to become effective, or coolant flows into radiator on cold start, remove thermostat for inspection. If problem is found, repair or replace as necessary. After repair, repeat DTC CONFIRMATION TEST  . If no problem is found, go to next step.
  3. Turn ignition off. Drain coolant. Disconnect ECT sensor No. 1 3-pin harness connector. ECT sensor is located in thermostat housing. See Figure . Remove ECT sensor No. 1. Measure resistance between ECT sensor terminals while it is immersed in a container of water. Heat water slowly and ensure resistance changes as specified. See Figure . If ECT sensor resistance does not changes as specified, replace sensor. After repair, repeat DTC CONFIRMATION TEST  . If resistance is as specified, go to next step.
  4. Check for high resistance or poor connection in ECT sensor circuit. If problem is found, repair as necessary. If ECT sensor circuit checks okay, substitute a known good ECM, and repeat DTC CONFIRMATION TEST  .
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