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the purpose of the choke relay is to supply power to the choke heater ONLY when the engine is running; otherwise if you left the key in the run position but the engine wasn't running the choke would open up even though the engine wasn't warmed up. then when you tried to start it, it wouldn't start because no choke. the control circuit for the relay usually comes off of the back of the alternator triad winding (alternator not turning=engine not running). without looking at a wiring diagram i can't tell you the details of the wiring but that's the idea of it- engine running turns relay on and sends power to choke heater and slowly opens up choke; key on but engine not running means relay is off and no power to choke heater. if the relay is not working, then no power will go to choke heater and the choke will stay on too long (or if ambient temps. are low it may stay on all the time). fast idle will stay on also as it is hooked up to choke linkage.

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13y ago
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Q: How does the choke relay work on a 1981 Toyota corona?
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