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)BODY & FRAMEBODY, CAB CONTROL SYSTEMSBODY COMPUTER SYSTEMSCOMPONENT TESTSCENTRAL PROCESSING UNIT (CPU)626
1999 Mazda 626 ES, 2.5 D, Standard
Central Processing Unit (CPU): 626
1999 Mazda 626 ES, 2.5 D, StandardSECTION 626
- Locate CPU unit behind left kick panel. Leave CPU connector attached. Using DVOM, measure voltage at specified terminals of CPU connector (backprobe connector). See Fig 1 through Fig 4 . See appropriate CPU CONNECTOR PIN VOLTAGES & CONTINUITY table. Disconnect CPU connector and check continuity at specified terminals.
- If voltage measurements or continuity are not as specified, check related components and wiring harnesses. If related components and wiring harnesses are okay, but system is still not functioning properly, replace CPU. See CENTRAL PROCESSING UNIT (CPU) under REMOVAL & INSTALLATION.
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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.