General Information: Diagnosis Mazda 3 BL

DTC troubleshooting flow (on-board diagnostic)

1. Diagnostic trouble codes (DTCs) are important hints for repairing malfunctions that are difficult to simulate. Perform the specific DTC diagnostic inspection to quickly and accurately diagnose the malfunction.
2. The on-board diagnostic function is used during inspection. When a DTC is shown specifying the cause of a malfunction, continue the diagnostic inspection according to the items indicated by the on-board diagnostic function.

Diagnostic index

1. The diagnostic index lists the symptoms of specific malfunctions. Select the symptoms related or most closely relating to the malfunction.

Quick diagnosis chart (If mentioned)

1. The quick diagnosis chart lists diagnosis and inspection procedures to be performed specifically relating to the cause of the malfunction.

Symptom troubleshooting

1. Symptom troubleshooting quickly determines the location of the malfunction according to symptom type.

Scheme 2

1. Perform the basic inspection procedure before symptom troubleshooting.
2. Perform each step in the order shown.
3. The reference column lists the location of the detailed procedure for each basic inspection.
4. Although inspections and adjustments are performed according to the reference column procedures, if the cause of the malfunction is discovered during basic inspection, continue the procedures as indicated in the action column.

Scheme 3

1. DTC troubleshooting flow shows diagnostic procedures, inspection methods, and proper action to take for each DTC.

Scheme 4

1. The symptoms of the malfunctions are listed in the diagnostic index for symptom troubleshooting.
2. The exact malfunction symptoms can be selected by following the index.

Scheme 5

1. The chart lists the relation between the symptom and the cause of the malfunction.
2. The chart is effective in quickly narrowing down the relation between symptom and cause of the malfunction. It also specifies the area of the common cause when multiple malfunction symptoms occur.
3. The appropriate diagnostic inspection relating to malfunction cause as specified by the symptoms can be selected by looking down the diagnostic inspection column of the chart.

Scheme 6

1. Symptom troubleshooting shows diagnostic procedures, inspection methods, and proper action to take for each trouble symptom.

Malfunction Diagnosis System

1. Use the Mazda modular diagnostic system (M-MDS) or equivalent for malfunction diagnosis.

Oil Leakage Inspection

1. Use either of the following procedures to identify the type of oil that is leaking

Road test

INSPECT the following items

1. Brake operation
2. Operation of gauges
3. Engine general performance
4. Emergency locking retractors and automatic locking retractors
5. Cruise control system (if equipped)
6. Operation of meters and gauges, squeaks, rattles, and abnormal noises

After road test

INSPECT for necessary owner information materials, tools, and spare tire in vehicle

The following items must be completed just before delivery to your customer.

1. Load test battery and charge if necessary (Load test result: Volts)
2. Adjust tire pressure to specification
3. Install fuses for accessories