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No.18 Cooling System Concerns-Runs Cold: Notes

DESCRIPTION & POSSIBLE CAUSE

18  COOLING SYSTEM CONCERNS-RUNS COLD 
DESCRIPTION 
  • Engine does not reach normal operating temperature.
POSSIBLE CAUSE 
  • Improper indication of low engine coolant temperature indicator light and/or high engine coolant temperature warning light
    • ECT sensor No. 1 malfunction
    • Instrument cluster malfunction
  • Cooling fan system malfunction
  • Condenser fan system malfunction
  • Thermostat malfunction
CAUTION:
  • Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
RELATED PIDs DESCRIPTION

Monitor item (Definition) Unit/Condition Condition/Specification (Reference)
ECT °C, °F
  • Displays the ECT
V
  • ECT is 20°C {68°F}: approx. 3.10 V 
  • ECT is 40°C {104°F}: approx. 2.16 V 
  • ECT is 60°C {140°F}: approx. 1.40 V 
  • ECT is 80°C {176°F}: approx. 0.87 V 
  • ECT is 100°C {212°F}: approx. 0.54 V 
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