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Voltage Question- PLEASE ANSWER :)

 
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Old 10-30-2010, 02:53 PM
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Voltage Question- PLEASE ANSWER :)

Does anyone know how much voltage (if any) is sent from the immobilizer on a 1998 Honda Prelude to the ECU to allow the car to start? The immobilizer is a car self-checklist that makes sure your brakes aren't failing and other potentially fatal problems aren't there before you start your car. I need to bypass the immobilizer because the module is bad but I need to know how much voltage the ecu wants to read in order to give the "ok" from the immobilizer that the car has passed the checklist and is good to start. Please please help me figure out what the voltage should be. Also, if you figure it out if you could quote your source that would be great because if i get the voltage wrong it could fry my ecu. Please and thanks! :)
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Old 10-31-2010, 12:06 PM
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Re: Voltage Question- PLEASE ANSWER :)

Boy, I have no clue what you are talking about. The only immobilizer I know of is the transponder immobilizer system in the ignition requiring the "known" key to be present in order to start. I may be wrong but I don't think any Hondas of our generation had anything even close to that kind of on board diagnostics that would inhibit the car from running.
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Old 10-31-2010, 01:09 PM
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Re: Voltage Question- PLEASE ANSWER :)

Yeah the only immobilizer I know is the one the above poster stated. And that uses a specific resistance in line to tell the ecu the correct key is in.
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Old 10-31-2010, 01:15 PM
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Re: Voltage Question- PLEASE ANSWER :)

Its actually not resistance. Its data. Resistance or voltage based example would be gm vats key where there is literally resistor contacts on the key or gm passlock system found in most 95 and up full size platforms where the key in the ignition presents a resistance the the bcm. Allowing it to start. The hondas as with most transponder key systems actually sends and receives data encoded in the key. No real way to override it.
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Old 10-31-2010, 01:35 PM
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Re: Voltage Question- PLEASE ANSWER :)

That's true. I was thinking of gm/ford. With hondas we always had to use a immobilizer bypass for remote start that we actually had to program with a computer. But I still don't know exactly what the OP was referring to.
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Old 10-31-2010, 02:33 PM
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Re: Voltage Question- PLEASE ANSWER :)

I'd say its better to replace the part that is broken, otherwise your going to replace both that and your ECU. Just my 2 cents. That circuit is probably not an easy one, I'd say there are so many variables like shared current between parallel and series circuits. I wouldn't even waste my time or brain cells meditating on that one.
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