Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Mazda B2300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Using World Diagnostic System (WDS) Or Equivalent Scan Tool
- Record Continuous Memory DTC & Freeze Frame Data (FFD) - Turn ignition on with engine off. Connect scan tool to DLC. See Fig 1 . Retrieve all stored DTCs. Observe and record all DTCs and Freeze Frame Data. Go to next step.
- Verify Related Repair Information Availability - Check for any related Technical Service Bulletins (TSBs). If any TSBs apply, perform indicated repair. If vehicle is not repaired, go to next step. If no TSBs apply, go to next step.
- Perform Key On Engine Off (KOEO) Self-Test - Start engine and allow to reach normal operating temperature. Turn off all electrical accessories. Perform KOEO Self-Test procedure. If any DTCs are present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, go to next step.
- Perform Key On Engine Running (KOER) Self-Test - Start engine. Perform KOER Self-Test procedure. If any DTCs are present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, go to next step.
- If Continuous Memory DTCs are present in first step, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If Continuous Memory DTCs are not present, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.