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.
1992 Mazda 929FACTORY OEM SERVICE PROCEDURE
Engine Control Unit (Except NAVAJO)
- Locate Engine Control Unit (ECU). See ECU LOCATION table. Connect Engine Signal Monitor (49-9200-162) to ECU. See Fig 1 . Check voltage at each terminal of ECU. If input and output component voltage readings are not as specified, check faulty component. See PIN VOLTAGE CHART S article, TESTS W/CODES - EXCEPT NAVAJO article and testing for appropriate component in this article.
- If input and output component voltages are as specified, and ECU voltage is incorrect, replace ECU.
CAUTION:
DO NOT apply voltage to terminals "A" and "B" of engine signal monitor. See Fig 1
.
ECU LOCATION
| Application | Location |
|---|---|
| B2200, B2600i & 929 | Behind Passenger Front Side Trim Panel |
| Miata & MPV | Under Passenger Front Floor Mat |
| MX-3, Protege & 323 | Behind Driver & Passenger Front Side Walls |
| MX-6 & 626 | Behind Passenger Side Console Cover |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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