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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 P0138 [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 RELATED PENDING CODE OR STORED DTCS 
  • Turn ignition key to OFF, then ON (Engine off).
  • Verify pending code or stored DTCs using the WDS or equivalent.
  • Is other DTC present?
 Yes Go to appropriate DTC troubleshooting procedures.
(See DTC TABLE )
No Go to the next step.
4 IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA 
  • Is DTC P0138 on FREEZE FRAME DATA?
 Yes Go to the next step.
No Go to troubleshooting procedures for DTC on FREEZE FRAME DATA.
(See DTC TABLE )
5 INSPECT HO2S (REAR) SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY CIRCUIT 
  • Turn the ignition switch off.
  • Disconnect HO2S (rear) connector.
  • Turn ignition key to ON (Engine off).
  • Measure voltage between HO2S (rear) terminal (harness-side) and body GND.
  • Is any voltage reading?
 Yes Replace short to power supply, then go to Step 7.
No Go to the next step.
6 VERIFY CURRENT INPUT SIGNAL STATUS 
  • Start engine.
  • Access O2S12 PID using the WDS or equivalent.
  • Verify PID when racing engine at least 10 times  (in PARK (AT), NEUTRAL (MT)).
  • Does PID reading stay above 1.2 V  ?
 Yes Repair or replace sensor, then go to the next step.
No Go to the next step.
7 VERIFY TROUBLESHOOTING OF DTC P0138 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.
  • Run DRIVE MODE 1 and 3.
  • Is PENDING CODE for this 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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