MSefi.com read only forum (Jan.15,2018)

Here is the msq.

I'll try to grab the msq and post later this week. I'm not sure what else to look into at this point. Dang, this has been the first major reliability hurdle.

Ok so the IAC driver is a UDN2916LB - h-bridge output. I didn't see any minimum load requirements in the datasheet so that theory is out. I have established some consistency - when it is hot enough to trigger the fans, and they don't come on, cycling the MS will get the fans to come on. I wonder if ...

Yes. It was either pin 25 or 29, can't remember which one I used. That went to the relay input positive side, the other side is grounded. I'll have to look through the bom and see what number the iac driver is and read it's datasheet. If it's minimum load spec is higher then the minor input current ...

Yes the IAC output is driving the solid state relay directly. Per megamanual here they can deliver more then 500ma each so the less then 32ma load should be plenty under that limit. The other 3 IAC outputs are disconnected and isolated, ends of the wire in the harness are taped up.

Some things that popped into mind -

I was re-reading the spare ports section of the manual with regards to using the stepper IAC ports. I have the idle scheme set to valve so that should leave the stepper IAC chip alone. I'm not sure if I'm using the IAC1A or IAC2A port. Manual said some versions ...

Compared to my fluke meter w/thermocouple in the top tank, the gauge was off only by a degree or two. Perhaps the sensor feeding the MS is a bit behind.

It seems to have worked fine since the initial roadside mishap. Every few trips I would let it sit in the parking lot idling to warm up and let ...

Matt I'm pretty sure the programming is fine as it worked normally in the driveway. Unless Megatune showed one thing but programmed another?

Did some more tinkering. I detached the CLT sensor from the harness and hooked it to a spare, then hit it with a small butane torch - it pegged at 215deg in ...

I have an MSII with v3 board with megatune 2.25. I've setup one of the IAC outputs (using a fast idle valve, no IAC) to control the electric fans. Set at >, 200 with hysteresis of 10, so in theory it is on at 200 and off at 190. Triggered value = 1.

When I first installed it, it worked fine in the ...