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.
1977 Mazda Cosmo Automatic TransFACTORY OEM SERVICE PROCEDURE
Choke Switch & Full Choke Switch
- Warm engine to normal operating temperature. Disconnect water temperature switch. Disconnect carburetor choke heater lead at connector and connect voltmeter to choke heater lead (from control unit).
- Connect tachometer to engine. On California vehicles, current should flow to choke heater lead, when engine is started with choke knob out. Knob should return after 20-60 seconds from engine starting time.
- Connect jumper wire to both terminals of disconnected carburetor choke heater lead (from control unit). Set engine speed at 2000 RPM with choke knob. Current should flow to choke heater lead. Current should stop flowing when choke knob is completely pushed in.
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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