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Diagnostic Procedure

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
DTC U0401:00 (ELECTRIC POWER STEERING (EPS)) DIAGNOSTIC PROCEDURE

Step Inspection Results Action
1 VERIFY PCM DTC
  • Using the M-MDS, perform the PCM DTC inspection. (See DTC INSPECTION .)
  • Are any DTCs present?
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G (US))] .)
DTC troubleshooting completed, then perform the repair completion verification.
No Go to the next step.
Repair completion verification VERIFY DTC TROUBLESHOOTING COMPLETED
  • Using the M-MDS, clear the DTC from the EPS control module. (See CLEARING DTC .)
  • Using the M-MDS, perform the EPS control module DTC inspection. (See DTC INSPECTION .)
  • Is the same Pending DTC present?
 Yes Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW (US) .)
If the CAN communication is normal, perform the diagnosis from Step 1.
  • If the malfunction recurs, replace the PCM.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (VIN L) (US)] .) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (VIN M) (US)] .) (See
No DTC troubleshooting completed.
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