Diagnostic Procedure

WARNING: This page is about a different car, the 2021 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0416:29 (AUTO LEVELING CONTROL MODULE - US) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	INSPECT DSC HU/Control Module FOR MALFUNCTION Perform the DTC inspection for the DSC HU/Control Module. (See DTC INSPECTION .) Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [DSC HU/Control Module (US)] .)
1		No	Go to the next step.
2	INSPECT DSC HU/Control Module FOR MALFUNCTION DEPENDING ON REPEATABILITY Clear the DTC recorded in the memory. (See CLEARING DTC .) Perform the DTC inspection for the auto leveling control module. (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, replace the DSC HU/Control Module and perform the repair completion verification. (See DSC HU/Control Module REMOVAL/INSTALLATION [L.H.D. (US)] .)
2		No	Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Clear the DTC recorded in the memory. (See CLEARING DTC .) Perform the DTC inspection for the auto leveling control module. (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 auto leveling control module, then go to the next step.
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTC IS DISPLAYED Perform the DTC inspection. (See DTC INSPECTION .) Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.