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.

Step	Inspection	Results	Action
1	INSPECT PCM FOR MALFUNCTION Perform the DTC inspection for PCM. (See DTC INSPECTION .) Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G (US))] .)
1		No	Go to the next step.
2	INSPECT BODY CONTROL MODULE (BCM) FOR MALFUNCTION Perform the DTC inspection for body control module (BCM). (See DTC INSPECTION .) Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [BODY CONTROL MODULE (BCM) (US)] .)
2		No	Go to the next step.
3	VERIFY REPLACEMENT RECORD OF DSC HU/CM Before performing the troubleshooting diagnostic procedure this time, verify if the DSC HU/CM was replaced. Was the DSC HU/CM replaced?	Yes	After re-implementing the required servicing when replacing the DSC HU/CM in accordance with DSC HU/CM removal/installation, perform the repair completion verification. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (US)] .)
3		No	Go to the next step.
4	RESET CONFIGURATION DATA FOR BODY CONTROL MODULE (BCM) Perform the body control module (BCM) configuration using the M-MDS. (See CONFIGURATION .) Clear the DTC recorded in the memory. (See CLEARING DTC .) Switch the ignition ON (engine off or on) and wait for 30 s or more. Perform the DTC inspection for the DSC HU/CM. (See DTC INSPECTION .) Is the same Pending DTC present?	Yes	Perform the body control module (BCM) configuration again using the M-MDS and perform the repair completion verification.
4		No	Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED Clear the DTC recorded in the memory. (See CLEARING DTC .) Switch the ignition ON (engine off or on) and wait for 30 s or more. Perform the DTC inspection for the DSC HU/CM. (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 DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (US)] .)
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.