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Home >> Mazda >> 2021 >> CX-3 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (On-Board Diagnostic - Adaptive Front Lighting System Control Module) >> DTC U0420-68: Error Signal Received From EPS Control Module >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.
Step Inspection Action
1 VERIFY EPS CONTROL MODULE DTCs  Yes Repair the malfunctioning part according to the applicable DTC troubleshooting.
(Refer to DTC TABLE [EPS CONTROL MODULE] .)
No Go to the next step.
2 PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS EPS CONTROL MODULE  Yes Replace the EPS control module, then go to the next step.
(Refer to STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION .)
No Go to Step 4.
3 VERIFY THAT REPAIRS HAVE BEEN COMPLETED  Yes Replace the AFS control module, then go to the next step.
(Refer to ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE REMOVAL/INSTALLATION .)
No Go to the next step.
4 VERIFY IF OTHER DTCs DISPLAYED 
  • Are any other DTCs displayed?
Yes Repair the malfunctioning part according to the applicable DTC troubleshooting.
(Refer to DTC TABLE [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
No DTC troubleshooting completed.