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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 155 (ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM L3))OBD-II DRIVE MODEPCM ADAPTIVE MEMORY PRODUCTION, EGR, H02S HEATER, H02S, TWC, AND EVAP SYSTEM REPAIR VERIFICATION DRIVE MODE
1999 Mazda 626 ES, 2.5 D, Standard
PCM Adaptive Memory Production, EGR, H02S heater, H02S, TWC, and EVAP System Repair Verification Drive Mode
1999 Mazda 626 ES, 2.5 D, StandardSECTION PCM Adaptive Memory Production, EGR, H02S heater, H02S, TWC, and EVAP System Repair Verification Drive Mode
WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- Start the engine and warm it up completely.
- Clear the DTC from the PCM memory using the WDS or equivalent.
- Verify the following conditions and correct if necessary:
- All accessory loads (A/C, headlights, blower fan, rear window defroster) are off.
- Initial ignition timing and idle speed are within the specification.
- Verify that all of the following PIDs are within the following specifications. All PIDs must be within specifications from Step 5 to Step 6.
- BARO: more than 72.3 kPa {542 mmHg, 21.3 inHg}
- IAT: 5-35 °C {41-95 °F}
- FTL 15-85%
- B+: above 10.9 V
- With the vehicle stopped, race the engine at the engine speed indicated, and then drive the vehicle as shown in the graph. The driving conditions before driving at constant speed are not specified. If possible, monitor RPM PID for engine speed during this procedure.
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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.