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 59 (ENGINE CONTROLS [SELF-DIAGNOSTICS 2.3L])SYSTEM TESTSELECTRONIC THROTTLE CONTROL SYSTEM INSPECTIONENGINE COOLANT TEMPERATURE COMPENSATION INSPECTION
1999 Mazda 626 ES, 2.5 D, Standard
Engine Coolant Temperature Compensation Inspection
1999 Mazda 626 ES, 2.5 D, StandardSECTION Engine Coolant Temperature Compensation Inspection
WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- Connect WDS or equivalent to the DLC-2.
- Select ECT, IAT, RPM PIDs.
- Verify engine is cold, then start engine.
- Verify engine speed decreases as engine warms up. If engine speed does not decrease or decreases slowly, inspect following:
- ECT sensor and related harness. Refer to ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article.
- Electronic throttle body and related harness. Refer to THROTTLE ACTUATOR under IDLE CONTROL in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article.
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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.