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 MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKES/TRACTION CONTROL (2)TROUBLE SHOOTINGTCS OPERATION IS NOT WORKING SUFFICIENTLYDIAGNOSTIC AIDS
1999 Mazda 626 ES, 2.5 D, Standard
Diagnostic Aids
1999 Mazda 626 ES, 2.5 D, StandardSECTION Diagnostic Aids
Enter this procedure only when DTCs have not been successfully retrieved or if directed here from another test or chart. This symptom test is only intended to diagnose:
- Improper tire size and tire air pressure.
- Malfunction of PCM.
- Malfunction of ABS system.
- Ensure tire size and tire air pressure meet manufacturer's specification. Replace tires or adjust tire air pressure as necessary. If tire size and tire air pressure meet manufacturer's specification, go to next step.
- Check for PCM related DTCs. See SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION - 626 article in ENGINE PERFORMANCE. If PCM related DTCs are present, see DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 626 article in ENGINE PERFORMANCE. If no PCM related DTCs are present, go to next step.
- Turn ignition switch to ON position. Perform ACTIVE COMMAND MODES PROCEDURE under ADDITIONAL SYSTEM FUNCTIONS. Input "0" N.m ENG TQR. Start engine and increase engine speed to 2000-3000 RPM. If engine speed (RPM) begins to decrease, system is normal. If engine speed (RPM) does not decrease, replace ABS CM.
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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.