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.
1984 Mazda B2000 Sundowner, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Speed Switch
- Connect voltmeter probes to throttle positioner 3-way solenoid electrical terminals without disconnecting electrical connector. Start engine and increase engine speed to 2000 RPM.
- Slowly decrease engine speed and note speed at which current flows to circuit. Engine speed should be 1600-1800 RPM on California models with A/T, and 1400-1600 on all others.
- Slowly increase engine speed again and record engine speed at which current does not flow. The difference between the recorded speeds should be 150-250 RPM. Replace engine speed switch if it does not operate as outlined.
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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