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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 60 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P0117: Engine Coolant Temperature Sensor Circuit - Low Input >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Inspect For Bent Terminal -  Turn ignition off. Disconnect ECT sensor 2-pin harness connector. Check for bent, damaged or corroded ECT sensor connector terminals. If no malfunction is detected, go to next step. If malfunction is present, repair terminal. After repair, go to step  7.
  4. Classify ECT Sensor Malfunction Or Harness Malfunction -  Connect WDS or equivalent to DLC-2. Access ECT PID. Verify ECT PID value when disconnecting ECT sensor harness connector. If ECT value changes, replace ECT sensor. After repair, go to step  7.
  5. Inspect ECT Signal Circuit For Short To Ground -  Turn ignition off. Disconnect PCM harness connectors. Check for continuity between ground and ECT sensor harness connector terminal "A" (Light Green/Black wire). See Fig 1. If continuity is not present, go to next step. If continuity is present, repair short circuit to ground in Light Green/Black wire between ECT sensor harness connector and PCM 30-pin harness connector terminal "1M" or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  7.
    Fig 1: Identifying ECT Sensor Circuits & Harness Connector Terminals
    G00221499Courtesy of MAZDA MOTORS CORP.
  6. Inspect ECT Circuit For Short Between Harnesses -  Check for continuity between ECT sensor harness connector terminals. If continuity is not present, go to next step. If continuity is present, repair short between circuits. After repair, go to next step.
  7. Verify Trouble Shooting Of DTC P0117 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition off. Start engine and warm it up completely. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  8. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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