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 MANUALSMAZDA20132 TOURING, 1.5L ENG VIN Z, AUTOMATIC TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESON-BOARD DIAGNOSTIC [DYNAMIC STABILITY CONTROL SYSTEM]DTC U0401:68: ABNORMAL MESSAGE FROM PCMDIAGNOSTIC PROCEDURE
2013 Mazda 2 Touring, 1.5L Eng VIN Z, Automatic Trans
Diagnostic Procedure
2013 Mazda 2 Touring, 1.5L Eng VIN Z, Automatic TransSECTION Diagnostic Procedure
DTC DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT FOR PCM MALFUNCTION
|
Yes | Go to applicable DTC inspection. (See DTC TABLE [MZR 1.5] ). |
| No | Go to the next step. | ||
| 2 | VERIFY THAT THE SAME DTC IS NOT PRESENT
|
Yes | Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZR 1.5] ). |
| No | Go to the next step. | ||
| 3 | VERIFY THAT NO OTHER DTCS ARE PRESENT
|
Yes | Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] ). |
| No | DTC troubleshooting completed. | ||
RENDER: 1.0x
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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.