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Home >> Mazda >> 2023 >> MX-5 Miata Grand Touring, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic - Engine Control (3 Of 3) >> DTC U0315-00: DSC HU/Control Module Error >> Diagnostic Procedure

Diagnostic Procedure

DTC U0315:00 (PCM (SKYACTIV-G 2.0)) DIAGNOSTIC PROCEDURE

STEP INSPECTION RESULTS ACTION
1 RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION 
NOTE:
  • Recording can be facilitated using the screen capture function of the PC.
  • Record the snapshot data on the repair order.
- Go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify 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 DTC FOR MODULE COMMUNICATION  Yes Go to the applicable PENDING CODE or DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 2.0)] .)
No Go to the next step.
4 VERIFY DSC HU/CM DTC  Yes Go to the applicable DTC inspection. (See DTC TABLE [DSC HU/CM] .)
No Go to the next step.
5 INSPECT DSC HU/CM CONNECTOR CONDITION 
  • Switch the ignition off.
  • Disconnect the DSC HU/CM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
Yes Repair or replace the connector and/or terminals, then go to Step 7.
No Go to the next step.
6 INSPECT PCM CONNECTOR CONDITION 
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
Yes Repair or replace the connector and/or terminals, then go to the next step.
No Go to the next step.
7 VERIFY DTC TROUBLESHOOTING COMPLETED  Yes Repeat the inspection from Step 1.
No Go to the next step.
8 VERIFY AFTER REPAIR PROCEDURE  Yes Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.0)] .)
No DTC troubleshooting completed.