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.
1986 Mazda 626 BaseFACTORY OEM SERVICE PROCEDURE
Code 1 (Ignition Pulse)
- Check that negative terminal of ignition coil is properly connected. If not, properly connect terminal. With ignition coil terminal properly connected, check that "1M" terminal voltage at ECU is between 12-13 volts.
- If voltage is correct, replace faulty ECU. If voltage is incorrect, check for open or short circuit in wiring harness from ignition coil to terminal "1M" of ECU connector.
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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