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 MANUALSMAZDA1990626 LX, 4D HATCHBACK, 2.2 1, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE SPEED CONTROL (ISC) SYSTEMISC VALVE
1990 Mazda 626 LX, 4D Hatchback, 2.2 1, Automatic
ISC Valve
1990 Mazda 626 LX, 4D Hatchback, 2.2 1, AutomaticSECTION ISC Valve
Measure resistance of Idle Speed Control (ISC) valve at 2-wire connector. See ISC RESISTANCE SPECIFICATIONS table. If not to specification, replace ISC valve.
ISC RESISTANCE SPECIFICATIONS
| Application | Testing Temperature °F (°C) | Ohms |
|---|---|---|
| MX-6 & 626 | 73 (23) | 6.3-9.9 |
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.