Question about 1991 Toyota Camry
Hi, the power comes from the EFI relay thru the circuit opening relay. The circuit opening relay is turned on by the ignition switch when in the start position and is then held on by a ground signal from the mass airflow sensor. The mass airflow sensor shuts off the relay when the engine stalls. The circuitry is designed such that the pump will not run simply by turning the ignition on. If you would like to test the pump, you can do that by cutting the green relay wire and connecting it to chassis ground. This will defeat the safety feature of the relay such that the pump will run whenever the key is on. Please let me know if you have more questions, and thanks for using FixYa.
Posted on Mar 26, 2011
Testimonial: "excellent Information, thank you. The car belongs an elderly person in our town and I trying to get the car going at no cost to him. Thanks"
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Posted on Jan 02, 2017
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