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Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0116 [BP, BP WITH TC] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has FREEZE FRAME DATA been recorded?
 Yes Go to next step.
No Record FREEZE FRAME DATA on repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or online 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 INSPECT ECT SENSOR CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect ECT sensor connector.
  • Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 7.
No Go to the next step.
4 INSPECT ECT SENSOR 
  • Measure resistance between ECT sensor terminals A and B (part-side).
  • Is the resistance within 2.21-2.69 kilohms [20°C {68°F}]? 
 Yes Go to the next step.
No Repair or replace ECT sensor, then go to Step 7.
5 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Disconnect PCM connector.
  • Inspect PCM terminals 4P and 4O (harness-side) for tightness using feeler tool.
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to the next step.
No Go to the next step.
6 COMPARE ECT PID VALUE 
  • Obtain new ECT sensor.
  • Clear DTC using the WDS or equivalent.
  • Connect ECT sensor connector to new ECT sensor without installing it to engine.
  • Turn ignition key ON and record ECT PID value.
  • Replace defect ECT sensor with new one.
  • Start engine and wait for 5 min  .
  • Record ECT PID value.
  • Is difference between ECT PID values more than 5.6°C {10.1°F}  ?
 Yes Go to step 8.
No Go to the next step.
7 VERIFY TROUBLESHOOTING OF DTC P0116 COMPLETED 
  • Leave vehicle for 6 h  .
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Start engine and wait for 5 min  .
  • Is same DTC present?
 Yes Replace PCM, then go to the next step.
8 VERIFY AFTER REPAIR PROCEDURE  Yes Go to the applicable DTC inspection.
(See DTC TABLE )
No Troubleshooting completed.
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