Connor_uzz31 Posted September 16, 2023 Report Share Posted September 16, 2023 1uz_soarer_16_9_23.pclx Hey guys first post on the forum, have a UZZ31 Soarer with a 1UZ and w58 manual swap among other things. The Xtreme is pretty overkill for what it has now but eventually intend on moving to E-Throttle, forced induction, COP, Full sequential eventually. Car is standard twin dizzy and semi sequential ignition, pretty much as standard as it can be. Using the standard triggers (Crank 12T and cam sensor) ECU hold power is setup that is working as it should. Car idled and settled perfectly on stock ECU. Have been having the a link xtreme g4x wired in, all has been going well and is pretty much done, managed to turn the car over and have it run, played with the master fuel to get it to run as smooth as I can on the base it has. However the IACV was not working at all when changing values etc, nothing I changed would get it to idle up or anything. Ended up pulling out the stepper head from the front of the engine to see if it's doing anything at all. With the stepper off the engine it doesn't appear to move at all, key off, on, changing idle values, but it does seem to be humming and making a differrent hum/vibration when the ECU is trying to actuate it (When you change the idle value % or key off) Not sure if I'm missing something but have tried changing different settings in the ECU, different clamps, step counts etc. Can confirm there is power on both middle pins that connect to the IACV just not sure what to look for now. Can't find any info on what it just vibrating with no movement would signify. Cheers Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 16, 2023 Report Share Posted September 16, 2023 Humming would possibly suggest the winding pins are paired wrong. Pinout should be like below. Quote Link to comment Share on other sites More sharing options...
Connor_uzz31 Posted September 16, 2023 Author Report Share Posted September 16, 2023 1 hour ago, Adamw said: Humming would possibly suggest the winding pins are paired wrong. Pinout should be like below. Have double checked the wiring and is exactly as the diagram suggests it to be wired, also swapped Aux 5/6 around and also seemed to do the same thing, not moving at all, no effect. Thanks again. Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 17, 2023 Report Share Posted September 17, 2023 With the idle valve plugged in and ignition off, can you uplug the ECU A plug, and measure what the resistance is between Aux 7 & 8 pins and then between aux 5 & 6 pins at the ecu plug (in the loom side). Quote Link to comment Share on other sites More sharing options...
Connor_uzz31 Posted September 19, 2023 Author Report Share Posted September 19, 2023 46ohm between 5 6 46ohm between 6 7 Same at ecu and same at IACV Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 19, 2023 Report Share Posted September 19, 2023 Sounds about what I expect then. It can only really be a stuck or otherwise faulty stepper in that case. Quote Link to comment Share on other sites More sharing options...
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