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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 P0118: Engine Coolant Temperature Sensor Circuit - High 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 ECT Sensor Connector For Poor Connection -  Turn ignition off. Disconnect ECT sensor harness connector. Inspect for poor connection (such as damaged, pulled-out pins, corrosion). If malfunctions are not present, go to next step. If malfunctions are present, repair terminal. After repair, go to  9.
  4. Classify ECT Sensor Malfunction Or Harness Malfunction -  Connect WDS or equivalent to DLC-2. Access ECT PID. Connect fused jumper wire between ECT sensor harness connector terminals. Verify ECT PID value. If voltage reading is 4.58 volts or more, go to next step. If voltage reading is less than 4.58 volts, replace ECT sensor. After repair, go to step  9.
  5. Inspect ECT Sensor Signal Circuit For Short To Power -  Turn ignition on, engine off. Measure voltage between ECT sensor harness connector terminal "A" (Light Green/Black wire) and body ground. See Figure. If battery voltage is not present, go to next step. If battery voltage is present, repair short circuit to power in Light Green/Black wire between ECT sensor harness connector terminal "A" 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  9.
  6. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM connectors. Inspect for poor connection (such as damaged, pulled-out pins, corrosion). If malfunctions are not present, go to next step. If malfunctions are present, repair or replace faulty terminal. After repair, go to step  9.
  7. Inspect ECT Sensor Signal Circuit For Open Circuit -  Check for continuity in Light Green/Black wire between ECT sensor harness connector terminal "A" and PCM 30-pin harness connector terminal "1M". If continuity is present, go to next step. If continuity is not present, repair open circuit in Light Green/Black wire between ECT sensor harness connector terminal "A" and PCM 30-pin harness connector terminal "1M". After repair, go to step  9.
  8. Inspect ECT Sensor Ground Circuit For Open Circuit -  Check for continuity in Brown wire between ECT sensor harness connector terminal "B" and PCM 30-pin harness connector terminal "2H". If continuity is present, go to next step. If continuity is not present, repair open circuit in Brown wire between ECT sensor harness connector terminal "B" and PCM 30-pin harness connector terminal "2H" or replace wire harness. After repair, go to next step.
  9. Verify Trouble Shooting Of DTC P0118 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.
  10. 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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