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Home >> Mazda >> 2000 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0117: Engine Coolant Temperature (ECT) Sensor Circuit Low Input >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check service bulletins. Go to next step.
  2. Start engine. Warm engine to operating temperature. Using scan tool, check ECT V PID. If ECT voltage is less than .2 volt, go to next step. If ECT voltage is .2 volt or more, problem is intermittent (not current).
  3. Turn ignition off. Inspect all applicable harness connectors. If no problem is found, go to next step. If problem is found, repair as necessary and go to step  7.
  4. Turn ignition on. Using scan tool, access PID/DATA MONITOR. Record PID data for ECT V. If ECT voltage is less than .2 volt, go to next step. If ECT voltage is .2 volt or more, replace ETS sensor. Go to step  7.
  5. Turn ignition off. Disconnect PCM connectors. Check continuity between ECT sensor harness connector terminal "A" (Red/Blue wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground on Red/Blue wire. Go to step  7.
  6. Check continuity between ECT harness connector terminals "A" (Red/Blue wire) and "B" (Black/Red wire). If continuity is not present, go to next step. If continuity is present, repair short between circuits as necessary and go to next step.
  7. Connect all connectors. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Start engine. If same DTC is not present, go to next step. If DTC is present, replace PCM. Go to next step.
  8. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. If any other DTC is present, diagnose and repair as necessary. If no DTC is present, testing is complete.
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