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No. 18 Cooling System Concerns-Runs Cold: Contents

18 COOLING SYSTEM CONCERNS-RUNS COLD
DESCRIPTION
  • Engine does not reach normal operating temperature.
TROUBLE AREA
  • Improper indication of low engine coolant temperature indicator light and/or high engine coolant temperature warning light
    • ECT sensor No. 1 malfunction
    • Combination meter malfunction
  • Cooling fan system malfunction
  • Condenser fan system malfunction
  • Thermostat malfunction (stuck at fully open)
  • Foreign matter penetration in engine coolant
NOTE:
  • Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
RELATED PIDS

Item (definition) Unit/Condition Definition Condition/Specification (Reference)
Engine coolant temperature °C, °F Engine coolant temperature
  • Displays ECT
V ECT sensor No. 1 voltage Ignition switched ON (engine off)
  • ECT is 29°C {84°F}: Approx. 2.65 V
  • ECT is 88°C {190°F}: Approx. 0.71 V
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