When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I'm here because of leaky cam sensor, oil in harness, misfire, etc. With great wisdom I decided to pull out the ECU to check for oil, and to inspect inside.
The connector pins look clean enough:
And because the damn thing looks like this, nothing is rattling inside, and I have no clue how to open it, I decided to put it right back.
HOWEVER... as I look down into the ECU bay, I notice this: (from top, looking straight down):
Zoomed in:
THAT connector is lost: there is no way it connects to the ECU - no connection at the back, and way to short to reach to the top. So, I guess Im just asking... WTF??
(I just have to admit: I have just been karma'd, me and my big mouth, eh Russell?)
Argh, before I forget: I have a power problem to the secondary air intake switch-over valve. The valve tests fine and clicks when fed from 12v source. But when I test it's power source from the ECU, it NEVER gets 12v, only about 2.2, not even while starting the car. I have not checked the wire from the valve to the ECU yet, but if it is possible that the problem might be ECU related, then I better open that bugger up before I put it back.
I think the ECU is glued you need to heat it up. Videos on YT
Hint: The SAI is only active when it is a real cold start. Engine temp must fall below 40 °C to activate it.
You can monitor the MAP sensor with your Torque in the morning on first start. When SAI is working it must rise to around -4 psi and fall after 1 minute to -7 psi
I'll forget about opening the ECU for now - it is easy enough to get it out again if need be. For now I just want it back in, so that I can do the testing you suggested in the sc thread.
But I have to figure out that loose connector in the ECU bay. It looks like a ground-only connection to me.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
