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Home >> Toyota >> 2000 >> MR2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0116: Engine Coolant Temperature Sensor Circuit Range/Performance >> Diagnosis & Repair
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Diagnosis & Repair

  1. Using Toyota hand-held tester or scan tool, check for any other DTCs. If only DTC P0116 exists, go to next step. If other DTCs exist, diagnose and repair those DTCs first and retest.
  2. Remove and inspect cooling system thermostat. If problem exists, replace thermostat as necessary and retest system. If problem does not exist, replace ECT sensor. Perform proper cooling system bleeding procedure when refilling cooling system. See COOLING SYSTEM BLEEDING under COOLING SYSTEM in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.
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