Idle speed control motor held fully open at key one engine off - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-13-2011, 12:38 AM   #1
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Default Idle speed control motor held fully open at key one engine off

I noticed a whine at key on engine off after installing the Hydra. I found it was the IAC/ISC motor and looked at the Hydra settings. The solenoid was being controlled fully on just pulling current for no good reason. I didn't see any good way in the settings to make sure this isn't running the solenoid before startup and just burning up batteries.

Has anyone run into this or resolved this issue?
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Old 04-13-2011, 12:48 AM   #2
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I would just not leave the key in the run position. If you need to use the radio that is what the ACC position on the ignition is for.
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Old 04-14-2011, 12:40 AM   #3
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I have the same problem. FM seemed unfamiliar with it and I haven't figured out a fix.
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Old 04-14-2011, 01:09 AM   #4
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Quote:
Originally Posted by Aricjm15 View Post
I would just not leave the key in the run position. If you need to use the radio that is what the ACC position on the ignition is for.
Still working on tune, logging, etc which means I often have the car on with key on engine off. The ISC just goes full bore and pulls some moderate current. This is the only ECU I have seen do this and it is a silly problem. I was hoping for a quick fix.

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I have the same problem. FM seemed unfamiliar with it and I haven't figured out a fix.
Jeremy seems to know about it and not have a fix but hinted that the 2.7 version has redone the ISC controls such that this may be resolved.
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Old 04-19-2011, 04:33 PM   #5
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I have the same issue, I swapped the throttle body off my 95 engine thinking maybe the iac was failing. I guess not?

Wonder how much 2.6->2.7 will cost us..
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Old 04-19-2011, 05:47 PM   #6
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I have the same issue, I swapped the throttle body off my 95 engine thinking maybe the iac was failing. I guess not?

Wonder how much 2.6->2.7 will cost us..
It isn't the iac, you can see the iac % in the logging parameters and see that it is being held open at max to achieve the target rpm which is well above 0 rpm. On a stepper, it would just move to that position and it would be ok. On a pwm solenoid like ours, it will be trying to hold the solenoid open at the maximum value constantly. Hydra should know better but there are soo many little nagging, beta type issues like this in the Hydra that it doesn't surprise me at this point.

Dunno about cost, apparently it will depend on which version of 2.7 you want. They will have something like 5 variations of 2.7, some of which are lower cost and lower feature and others that are higher cost and higher feature set. I saw a lot of posts from sellers around this time last year saying the 2.7 was weeks away so I hope they delayed it by over a year now to have everything more dialed in that 2.6. Whenever I am using 2.6, I feel like I am being transported back to the first windows interfaces of Motec / Autronic / Electromotive where everyone was just trying to figure out the functionality and workflow and all software was expected to be buggy.
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Old 04-19-2011, 05:54 PM   #7
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Put a relay on the +12V supply to the sonenoid (2001-2005: 2P). Program the Hydra to enable the relay when RPM>50.

Win.
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Old 05-04-2011, 07:12 PM   #8
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Put a relay on the +12V supply to the sonenoid (2001-2005: 2P). Program the Hydra to enable the relay when RPM>50.

Win.
Yeah, except it is a cover for poor design. Plus, when you have 5 afr sensors (not sure if you are doing per port then post cat or just per port then collector and if they are all heated or wbo2) and the various wiring changes it is a little simpler to tee into your heavily modified loom. I'd prefer Hydra just not program in stupidity which is what holding the isc fully open amounts to as it can't recognize the condition in which it should not be held wide open.
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