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Home >> Mazda >> 2001 >> 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 DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
  2. Start and warm engine to operating temperature. Using scan tool, access ECT V PID data. If ECT PID is less than .2 volt, go to next step. If ECT PID is .2 volt or more, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
  3. Turn ignition off. Disconnect ECT sensor connector. Check connector for loose or damaged terminals, poor contact or corrosion. 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 ECT V PID data. If ECT PID is less than .2 volt, go to next step. If ECT PID is .2 volt or more, replace ETS sensor and go to step  7.
  5. Turn ignition off. Disconnect appropriate PCM connectors. Check for continuity between ground and ECT sensor harness connector terminal "A" (Red/Blue wire). See Fig 1. If continuity is not present, go to next step. If continuity is present, repair short to ground on Red/Blue wire. See WIRING DIAGRAMS article. Go to step  7.
  6. Check for continuity between ECT sensor harness connector terminals "A" (Red/Blue wire) and "B" (Black/Red wire). See Fig 1. 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. Reconnect all connectors. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0117 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0117 is not present, go to next step.
  8. Cycle ignition from off to on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.
Fig 1: Identifying ECT Sensor Harness Connector Terminal
G00032522Courtesy of MAZDA MOTORS CORP.
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