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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 P0103 [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 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 VERIFY CURRENT INPUT SIGNAL STATUS-IS CONCERN INTERMITTENT OR CONSTANT 
  • Connect WDS or equivalent to DLC-2.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Start engine and race it.
  • Access MAF PID using the WDS or equivalent.
  • Is same DTC present?
 Yes Go to the next step.
No Intermittent concern exists. Go to INTERMITTENT CONCERNS TROUBLESHOOTING procedure.
(See INTERMITTENT CONCERN TROUBLESHOOTING )
4 INSPECT MAF SENSOR CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect the MAF sensor connector.
  • Check for bent terminal.
  • Is there any malfunction?
 Yes Repair or replace terminals, then go to Step 7.
No Go to the next step.
5 INSPECT MAF SIGNAL CIRCUIT FOR SHORT TO POWER CIRCUIT 
  • Turn ignition key to ON (Engine off).
  • Measure voltage between MAF sensor terminal B (harness-side) and body GND.
  • Is the voltage below 0.1 V  ?
 Yes Go to the next step.
No Repair or replace suspected harness, then go to Step 7.
6 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect PCM connector.
  • Check for bent terminal.
  • Is there any malfunction?
 Yes Repair terminal, then go to the next step.
No Go to the next step.
7 VERIFY TROUBLESHOOTING OF DTC P0103 COMPLETED 
  • Make sure to connect all disconnected connectors.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Start engine and race it.
  • 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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