IACV stepper question

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speed 450mx · #1 Post by **speed 450mx** » Mon Aug 20, 2007 5:03 pm

Not my tps. Its my idle control shows that its at 205 all the time. Also are there any ways to tell when its fixing to go out.

wistech · #2 Post by **wistech** » Mon Aug 20, 2007 5:26 pm

If your talking you IAC is at 205 on the D@M then it would be saying its at operating temp and the iac valve is fully closed at 205. Now if it says that while it cold then I would make sure your coolant temp sensor is plugged in or at least functioning.

kdeal · #3 Post by **kdeal** » Mon Aug 20, 2007 5:29 pm

I think you a refering to the stepper motor setting of 205. This should always be at 205 once the engine is warm. Think of it as a choke mechanism. It starts around 170 and tops out at 205 when fully warmed up. Look in the D&M manual and do some reading on what all the settings represent. Also, Harry Moto has a Web sight with some good explanations as well. The link is on Cannondaler, but I think it is www.harrymoto.com.

speed 450mx · #4 Post by **speed 450mx** » Mon Aug 20, 2007 10:09 pm

Its at 205 all the time I am work to day so I cant check tell tomarrow. The question I asked is if there is way to tell its not working right. Or does it cause any problems when riding.

cdsracer · #5 Post by **cdsracer** » Tue Aug 21, 2007 2:59 pm

Check out the IACV section in the EFI Training Manual. It will tell you how to test it using the coolant temp sensor. With the D&M hooked up simultaneously, you can connect and disconnect the coolant temp sensor and you should see the IACV position change on your screen, and you should witness the actual IACV physically move to confirm operation. I would suspect the coolant temp. sensor like Wistech said. The D&M can only monitor the ECU's desire to command the IACV to move to 205, it cannot monitor actual movement. Therefore, if it desires a 205 position when cold, this indicates a malfunctioning or disconnected coolant temp sensor.