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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 P0125 [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 the 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 VERIFY CURRENT INPUT SIGNAL STATUS IS CONCERN INTERMITTENT OR CONSTANT 
  • Clear DTC using the WDS or equivalent.
  • Start engine
  • Warm up engine completely.
  • Access ECT PID.
  • Is ECT PID above 60°C {140°F}  ?
 Yes Intermittent concern exists. Go to INTERMITTENT CONCERNS TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING )
No Go to the next step.
4 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.
5 INSPECT ECT SENSOR 
  • Measure resistance between ECT sensor terminal A and B (part-side).
  • Is resistance approx.2 kilohms  ?
 Yes Go to the next step.
No Replace ECT sensor, then go to Step 7.
6 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Disconnect PCM connector.
  • Check for poor connection at terminal 4P and 4O (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.
7 VERIFY TROUBLESHOOTING OF DTC P0125 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Turn ignition key to ON (Engine off).
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Access ECT PID.
  • Wait until ECT PID below 20°C {68°F}. 
  • Start engine and warm it up completely.
  • Is same DTC present?
 Yes Replace PCM, then go to the next step.
No 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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