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Home >> Acura >> 2003 >> MDX Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Performance System Self-Diagnostics >> Diagnostic Tests >> DTC P0116: Engine Coolant Temperature Sensor Circuit, Range/Performance Problem

DTC P0116: Engine Coolant Temperature Sensor Circuit, Range/Performance Problem

CAUTION: When substituting or replacement of PCM is recommended, see PCM REMOVAL & REPLACEMENT  for important precautions.
  1. Turn ignition on. Using Honda PGM Tester or the HDS, check ECT sensor in the DATA list. If ECT reading is about 176°F (80°C) or higher, 0.86 volt or less, go to next step. If ECT reading is not about 176°F (80°C) or higher, 0.86 volt or less, go to step  3 .
  2. Note current coolant temperature. Turn ignition off. Cool engine for one hour. Using Honda PGM Tester or the HDS, check ECT sensor in the DATA list. If ECT reading changes 5.4°F (3°C) or more, problem is intermittent, system is OK at this time. Check thermostat and cooling system. If ECT reading changes 5.4°F (3°C) or more, go to step  4 .
  3. Note current coolant temperature. Start engine. Hold engine at 3000 RPM with no load in (Park or Neutral) until the radiator fan comes on, then let engine idle. Using Honda PGM Tester or the HDS, check ECT sensor in the DATA list. If ECT reading changes 5.4°F (3°C) or more, problem is intermittent, system is OK at this time. Check thermostat and cooling system. If ECT reading changes 5.4°F (3°C) or more, go to step  4 .
  4. Turn ignition off. Replace the ECT sensor. Turn ignition on. With the Honda PGM tester or the HDS, do PCM RESET in the CLEAR menu. Do the PCM idle learn procedure. See PCM IDLE LEARN PROCEDURE  .
  5. Allow engine to cool to between 17°F (-7°C) and 86°F (30°C).
  6. Start engine, let idle for 20 minutes.
  7. Check for Temporary DTCs or DTCs in the DTC menu. If DTC P0116 is set, check for poor connections or loose terminals at ECT sensor and PCM harness connectors. Go to step  1 . If any other Temporary DTCs or DTCs are set, troubleshoot those indicated. If Temporary DTCs or DTCs are not set, go to next step.
  8. Monitor the OBD STATUS for DTC P0116 in the DTCs menu with the Honda PGM tester or the HDS. If it PASSED, troubleshooting is complete. If it is FAILED, check for poor connections or loose terminals at MAP sensor and PCM harness connectors. Go to step  1 . If it is NOT COMPLETED, go to step  5 and recheck.
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