007 Posted October 19, 2016 Report Posted October 19, 2016 Hello Scott. I finally managed get my engine running smoothly with my G4 Xtreme, but there's still a fly in the ointment.I'm trying to use a 3 wire Honda RACV that looks like this: http://i130.photobucket.com/albums/p254/bazwouterze/Honda Civic/DSC00876.jpgTo do this, I set Aux Out 1 to ISC Sol Slave and Aux Out 2 to ISC Solenoid, with a frequency of 500 Hz. With Idle Control in Open loop, nothing that I enter in the Duty Cycle table has any effect. The engine idles really high like the RACV is fully open. I kept changing ISC Solenoid frequency all the way from 20 to 500 Hz, and nothing worked. Connected another RACV that I had lying around to see how the shutter behaved, and for frequencies above 20 Hz, I don't hear or feel the solenoid buzz like it should. Even when it clicks rapidly at 20 Hz, it is unable to control idle.I have a good mind to fix a 2 wire IACV there, but would really like to run the RACV. Any suggestions? Quote
Simon Posted October 20, 2016 Report Posted October 20, 2016 (edited) Hi There are some later model solenoids that are 3 wire but they run like a 2 wire unit.The connections are then Power, Ground and a signalTo confirm this you would need a wiring diagram for the car it came off or measuring on a working car/engine. Edited October 20, 2016 by Simon Quote
Scott Posted October 20, 2016 Report Posted October 20, 2016 I think this page has info on the idle solenoid you are using:http://www.hondacivicforum.com/forum/mechanical-problems-technical-chat-8/iacv-harness-2-wire-motor-3-a-81865/Looking at the schematic image it appears that the idle solenoid might need +12V(ign switched), an ECU postive control, and an ECU negative control. If this is the case I think our ECU will not be able to control it, as our ECU outputs ground on aux 1 and ground aux 2 to move the solenoid in opposite directions.Scott Quote
007 Posted October 20, 2016 Author Report Posted October 20, 2016 (edited) I believe this IACV requires a PWM ground signal on both pins besides the +12V pin to move the shutter in opposite directions. Let me try to scope the stock ECU's control signals versus the Link and revert. Edited October 20, 2016 by 007 Quote
Scott Posted October 20, 2016 Report Posted October 20, 2016 Ok, cool, hopefully you are correct. then the Link may be able to replicate this.Scott Quote
007 Posted October 20, 2016 Author Report Posted October 20, 2016 Solved!Again, it was the default settings that did me in. The max and min clamps in the IACV settings were holding the commanded duty cycle back.The IACV works as I guessed before. Unpowered, the shutter is halfway open and that is where it returns to rest once any applied signal is removed. Grounding the IACVP pin rotates the shutter one way and grounding IACVN rotates it the other way. 50% duty cycle keeps the shutter at its default position. Anything above or below 50% either increases or decreases idle depending on how IACVP and IACVN are wired. Quote
Scott Posted October 21, 2016 Report Posted October 21, 2016 Thanks for reporting back to let us know how it works.Scott Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.