Intention of troubleshooting 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 1-7
- Perform a fuel injector control system inspection.
Step 8-9
- Perform an emission system parts inspection.
Step 10-13
- Perform an intake air system parts inspection.
Step 14-17
- Perform a valve timing inspection.
Step 18-19
- Perform an exhaust system parts inspection.
Repair completion verification
- Verify that the primary malfunction is resolved and there are no other malfunctions.

TROUBLESHOOTING DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	PURPOSE: VERIFY IF CAUSE OF MALFUNCTION IS RELATED TO LACK OF FUEL Verify the remaining amount of fuel. Is there a lack of fuel?	Yes	Refill the fuel and perform the repair completion verification.
1		No	Go to the next step.
2	PURPOSE: INSPECT FUEL PRESSURE SENSOR FOR MALFUNCTION Inspect the applicable part. (See FUEL PRESSURE SENSOR INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FUEL INJECTOR REMOVAL/INSTALLATION (VIN M) .)
3	PURPOSE: INSPECT HIGH PRESSURE FUEL PUMP FOR MALFUNCTION Inspect the applicable part. (See HIGH PRESSURE FUEL PUMP INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION (VIN M) .)
4	PURPOSE: VERIFY IF MALFUNCTION RELATED TO FUEL LEAK FROM FUEL SYSTEM OR RESTRICTION AFFECTS DIAGNOSTIC RESULTS Inspect the fuel system pipes (low to high pressure sides) for fuel leakage and restriction. Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification.
4		No	Go to the next step.
5	PURPOSE: INSPECT FUEL PUMP CONTROL MODULE FOR MALFUNCTION Inspect the applicable part. (See FUEL PUMP CONTROL MODULE INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FUEL PUMP CONTROL MODULE REMOVAL/INSTALLATION (VIN M) .)
6	PURPOSE: INSPECT FUEL PUMP UNIT FOR MALFUNCTION Inspect the applicable part. (See FUEL PUMP UNIT INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FUEL PUMP UNIT REMOVAL/INSTALLATION (VIN M) .)
7	PURPOSE: INSPECT FUEL INJECTOR FOR MALFUNCTION Inspect the applicable part. (See FUEL INJECTOR INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FUEL INJECTOR REMOVAL/INSTALLATION (VIN M) .)
8	PURPOSE: INSPECT PURGE SOLENOID VALVE FOR MALFUNCTION Inspect the applicable part. (See PURGE SOLENOID VALVE INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION (VIN M) .)
9	PURPOSE: INSPECT PCV VALVE FOR MALFUNCTION Inspect the applicable part. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION (VIN M) .)
10	PURPOSE: INSPECT MAF SENSOR FOR MALFUNCTION Inspect the applicable part. (See MASS AIR FLOW (MAF) SENSOR INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 1 REMOVAL/INSTALLATION (VIN M) .)
11	PURPOSE: VERIFY IF MALFUNCTION RELATED TO AIR CLEANER ELEMENT AFFECTS MEASUREMENT OF INTAKE AIR AMOUNT Inspect the applicable part. (See AIR CLEANER ELEMENT INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AIR CLEANER ELEMENT REMOVAL/INSTALLATION (VIN M) .)
12	PURPOSE: INSPECT MAP SENSOR FOR MALFUNCTION Inspect the applicable part. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 2 REMOVAL/INSTALLATION (VIN M) .)
13	PURPOSE: VERIFY IF MALFUNCTION RELATED TO INTAKE AIR SYSTEM AFFECTS DIAGNOSTIC RESULTS Visually inspect for loose, cracked or damaged hoses on intake air system. Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification.
13		No	Go to the next step.
14	PURPOSE: INSPECT ELECTRIC VARIABLE VALVE TIMING DRIVER FOR MALFUNCTION Inspect the applicable part. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
14		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION (VIN M) .)
15	PURPOSE: INSPECT ELECTRIC VARIABLE VALVE TIMING MOTOR FOR MALFUNCTION Inspect the applicable part. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
15		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION (VIN M) .)
16	PURPOSE: INSPECT ELECTRIC VARIABLE VALVE TIMING ACTUATOR FOR MALFUNCTION Inspect the applicable part. (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
16		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION (VIN M) .)
17	PURPOSE: INSPECT OCV FOR HYDRAULIC VARIABLE VALVE TIMING SYSTEM FOR MALFUNCTION Inspect the applicable part. (See OCV FOR HYDRAULIC VARIABLE VALVE TIMING SYSTEM INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
17		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See OCV FOR HYDRAULIC VARIABLE VALVE TIMING SYSTEM REMOVAL/INSTALLATION (VIN M) .)
18	PURPOSE: INSPECT A/F SENSOR FOR MALFUNCTION Inspect the applicable part. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION (VIN M) .) Is the part normal?	Yes	Go to the next step.
18		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION (VIN M) .)
19	PURPOSE: VERIFY IF MALFUNCTION RELATED TO EMISSION SYSTEM AFFECTS HO2S SIGNAL Verify the exhaust gas leakage from the exhaust system. (between A/F sensor and HO2S) Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification.
19		No	Go to the next step.
Repair completion verification	PURPOSE: 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 .) Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Implement the repeatability verification procedure. (See REPEATABILITY VERIFICATION PROCEDURE .) Perform the DTC inspection for the PCM. (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 (VIN M) .)
Repair completion verification		No	DTC troubleshooting completed.