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Home >> Mazda >> 2006 >> MX-5 Miata Base >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System] >> DTC P0116 >> Diagnostic Procedure
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Diagnostic Procedure

DTC P0116 DIAGNOSTIC PROCEDURE TABLE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED 
  • Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Engine cooling system related) been recorded?
 Yes Go to the next step.
No Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA 
  • Is DTC P0116 on FREEZE FRAME DATA?
 Yes Go to the next step.
No Go to troubleshooting for DTC on OBD-II FREEZE FRAME DATA  .
(See DTC TABLE  .)
4 INSPECT ECT SENSOR CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect ECT sensor connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 8.
No Go to the next step.
5 INSPECT ECT SENSOR  Yes Replace the ECT sensor, then go to Step 8.
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
No Go to the next step.
6 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 8.
No Go to the next step.
7 COMPARE ECT PID VALUE 
  • Prepare a new ECT sensor.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Connect the ECT sensor connector to the new ECT sensor without installing to the engine.
  • Turn the ignition switch to the ON position and record the ECT PID value.
  • Replace the malfunction ECT sensor with new one.

    (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)

  • Start the engine and wait for 5 min  .
  • Is the difference between ECT PID values more than 6°C {10.8°F} 
 Yes Go to the next step.
No Inspect the thermostat.
  • If the thermostat is normal, go to the next step.
  • If the thermostat is not normal, then go to the next step.
8 VERIFY TROUBLESHOOTING OF DTC P0116 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear DTC from PCM memory using WDS or equivalent.
  • Start the engine and warm it up to completely.
  • Is the PENDING CODE same DTC present?
 Yes Replace PCM, then go to next step.
(See PCM REMOVAL/INSTALLATION .)
No Go to next step.
9 VERIFY AFTER REPAIR PROCEDURE  Yes Go to applicable DTC inspection.
(See PCM REMOVAL/INSTALLATION .)
No Troubleshooting completed.
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