Question about 1991 Toyota Pickup

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ECM Not communicating with my scanner

Hi, I have a 1991 Toyota Pickup and the check engine light is on. I have tried to scan it but it says there is no power to the ECM. So I need to know if anyone can help me with a wiring diagram. Also the truck has had the ignition switch removed and after market switches installed. The truck was green stickered as a Prerunner but now I would like to gete it smogged. Thanks for any help, Neil

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  • racerp419 Dec 27, 2008

    I have the scan tool thats hooks up under the hood and is supossed to make the CE light falsh the code or codes. The fuses are all good and I need the wiring diagram to check the ECM. The truck does start and drive so I would think the ECM is working. Thanks.

  • racerp419 Dec 27, 2008

    I have unhooked the battery and the CE light is still on. When the truck is started the light does not prove out. Thanks Again.

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It's an OBD I system, so you can't hook up to the ECM with an OBD II scan tool. Have you made sure the ECM is getting power and ground? Have you ruled out any blown fuses, tripped circuit breakers, or blown fusible links?

Posted on Dec 27, 2008

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