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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Engine Controls - Self-Diagnostics - 2.5L) >> Diagnostic Tests >> DTC P0116: ECT Sensor Circuit Performance Problem >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
  2. Start engine and allow it to reach normal operating temperature. Using scan tool, check ECT PID data. If ECT PID data is 50°F (10°C) or more, go to next step. If ECT PID data is less than 50°F (10°C), problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  3. Turn ignition off. Disconnect ECT sensor connector. Check for damaged or corroded ECT sensor connector terminals. Repair as necessary, and go to step  6 . If connector terminals are okay, go to next step.
  4. Measure resistance between ECT sensor connector terminals. If resistance is about 2 k/ohms, go to next step. If resistance is not about 2 k/ohms, replace ECT sensor and go to step  6 .
  5. Disconnect PCM connector. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to next step. If connector terminals are okay, go to next step.
  6. Reconnect all connections. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Run engine under freeze frame data conditions. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0116 is present, replace PCM and go to next step. See REMOVAL, OVERHAUL & INSTALLATION article. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES - IMPORT article in GENERAL INFORMATION. If DTC P0116 is not present, go to next step.
  7. Perform DTC confirmation procedure. See DTC CONFIRMATION PROCEDURE  under SELF-DIAGNOSTIC SYSTEM. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.
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