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.
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HOMESERVICE MANUALSMAZDA20066 S, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM (WITH KEYLESS ENTRY SYSTEM)]SECURITY LIGHT: DTC 13 (WDS OR EQUIVALENT: DTC B2431)DIAGNOSTIC PROCEDURE
2006 Mazda 6 s, 4D Sedan, Standard
Diagnostic procedure
2006 Mazda 6 s, 4D Sedan, StandardSECTION Diagnostic procedure
DTC B2431 DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | VERIFY DTC USING SST
|
Yes | Go to Step 3. |
| No | Go to next step. | ||
| 2 | VERIFY DTC USING SST
|
Yes | Go to SECURITY LIGHT: DTC 13 (WDS OR EQUIVALENT: B1600) . |
| No | Go to next step. | ||
| 3 | INSPECT PCM
|
Yes | Replace PCM and reprogram immobilizer system. (See IMMOBILIZER SYSTEM REPROGRAM PROCEDURE [WITH KEYLESS ENTRY SYSTEM]. ) |
| No | Troubleshooting is completed. | ||
RENDER: 1.0x
NO RELATED
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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.