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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 P0038 [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 INSPECT HO2S (REAR) TERMINAL 
  • Turn the ignition switch off.
  • Disconnect HO2S (rear) connector.
  • Check for bent terminals.
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 7.
No Go to the next step.
4 INSPECT HO2S HEATER (REAR) 
  • Measure resistance between HO2S (rear) terminals C and D (part-side).
  • Is resistance within 14.1-18.9 ohms  ?
 Yes Go to the next step.
No Replace the HO2S (rear), then go to Step 7.
5 INSPECT PCM TERMINAL 
  • Disconnect PCM connector.
  • Check for bent terminals at terminal 3P.
  • Is there any malfunction?
 Yes Repair terminal, then go to Step 7.
No Go to the next step.
6 INSPECT HO2S HEATER (REAR) CONTROL CIRCUIT FOR SHORT TO POWER 
  • Turn ignition key to ON (Engine off).
  • Measure voltage between HO2S (rear) terminal D (harness-side) and body GND.
  • Is voltage B+  ?
 Yes Repair or replace harness for short to power supply, then go to the next step.
No Go to the next step.
7 VERIFY TROUBLESHOOTING OF DTC P0038 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • 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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