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.

FUEL-FILLER LID CANNOT BE LOCKED/UNLOCKED [SECURITY AND LOCKS] DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	VERIFY ALL SYSTEM DTCs Perform the DTC inspection. (See DTC INSPECTION .) Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
1		No	Go to the next step.
2	INSPECT FUEL-FILLER LID LOCK ACTUATOR AND ELECTRICAL SUPPLY UNIT CONNECTORS FOR MALFUNCTION Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION .) Are the connector and terminal normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT FUEL-FILLER LID LOCK ACTUATOR SIGNAL CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT Inspect the signal circuit for a short to ground and open circuit. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT FUEL-FILLER LID LOCK ACTUATOR FOR MALFUNCTION Inspect the applicable part. (See FUEL-FILLER LID LOCK ACTUATOR INSPECTION .) Is the part normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FUEL-FILLER LID LOCK ACTUATOR REMOVAL/INSTALLATION .)
Repair completion verification	VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
Repair completion verification		No	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 is not resolved, replace the electrical supply unit. (See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION .)