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Vtec problems


Kyle H.

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Hello, I'm new to this forum so forgive me if i'm not doing it right. I have a problem with my accords vtec system. It doesn't work, it doesn't have any trouble codes or check engine light. I have replaced the thermostat because it was stuck open causing the car to run in open loop because it never got to operating temperature, I thought that was the problem and it wasn't. I've also ran a wire from the connector on the vtec solenoid inside the care to my test meter, at the rpm which vtec is supposed to start working(4800) it shows 1.08-1.10 volts. The vtec solenoid is functional, the oil pressure sensor tests good, it is full of clean oil, and I am all out of ideas. All tips and suggestions are appreciated.

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Well I thought about that and i'm sure it needs to be cleaned/replaced, but before I started tearing it apart I wanted to figure out why the solenoid isn't getting voltage. Even if the screen is clogged the PCM should still open the solenoid right? The car has 226,000+, but it has been cared for, so it's not junk.

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you absolutely should be getting an engine light if vtec is not functioning properly for any reason. if you know someone with an OBD reader , fire it on and see what it says. tap a test light into the wire for the engine light at the ecu for craps and giggles.

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you absolutely should be getting an engine light if vtec is not functioning properly for any reason. if you know someone with an OBD reader , fire it on and see what it says. tap a test light into the wire for the engine light at the ecu for craps and giggles.

 

 

yeah use a test light and see if it lights up when vtec comes on. Also can use a volt meter to be accurate as far as voltage. If there is 0volts and when it comes it only shows less than 12 volts the you might have a grounding issue (loose or corroded or damage). Let me know what you find

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I've got a snap-on scanner at work, and it shows no problems whatsoever, check engine light is good. It lights up when you turn the key, and also when you leave something unplugged. I did wire my test meter to the solenoid wire directly on the connector, and the most I have ever got is 1.08-1.10 volts. I'm starting to think it's a ECU problem, it just doesn't seem to turn it on.

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I've got a snap-on scanner at work, and it shows no problems whatsoever, check engine light is good. It lights up when you turn the key, and also when you leave something unplugged. I did wire my test meter to the solenoid wire directly on the connector, and the most I have ever got is 1.08-1.10 volts. I'm starting to think it's a ECU problem, it just doesn't seem to turn it on.

 

 

well swap a good ecu in to it and see if you get the same voltage from the output, if you do it is something else. Grounds!

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