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2008 - MX-5 - Engine

DTC P0116 [LF]



DTC P0116

Engine coolant temperature circuit range/performance

DETECTION CONDITION

  • The PCM monitors the maximum value and minimum value of engine coolant temperature when the engine is started and 5 min have been passed after leaving the vehicle 6 h or more. If difference between maximum and minimum values of engine coolant temperature is below 6 °C {10.8 °F} the PCM determines that there is an ECT circuit range/performance problem.

    Diagnostic support note
  • This is a continuous monitor. (Engine cooling system)

  • The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.

  • PENDING CODE is available if the PCM detects the above malfunction condition.

  • FREEZE FRAME DATA is available.

  • The DTC is stored in the PCM memory.

POSSIBLE CAUSE

  • ECT sensor malfunction

  • Connector or terminal malfunction

  • PCM malfunction


Diagnostic procedure

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

INDETIFY 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 FREEZE FRAME DATA.

(See DTC TABLE [LF].)

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 [LF].)

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 M-MDS.

  • 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 [LF].)

  • 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 M-MDS.

  • 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 [LF].)

No

Go to next step.

9

VERIFY AFTER REPAIR PROCEDURE

Yes

Go to applicable DTC inspection.

(See PCM REMOVAL/INSTALLATION [LF].)

No

Troubleshooting completed.




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