I'm looking for the pinout drawing of the plug for a 2014 ML350 Fuel System Control Unit. I've got a dead short to ground at the fuel pump fuse and want to work my way back before I send it off for a fuel pump replacement. I'm an electronic tech by trade, and at least in my experience most pumps burn open and not short so I'm steering away from the actual pump. If I have a bad module or wire I should be able to see which way to go at least from there.

 

Sent email with my vin

 

if you didn't get the mail 4JGDA5JB1EA269987

 

I've gotten to the point I just need to know if the larger brown wire is a negative wire (leftmost top pin 2) control module is a0009001803 if that helps

 

I guess that's awesome news, that was the only wire I was showing a dead short to ground on. I have a dead short to groundat the fuse with the controller connected (open with controller disconnected).
I popped open the controller and it was full of water with no burn marks so I hit it with contact cleaner and gonna let it sit in a bag of rice in the sun to see if it can be spared from the junk pile. Here's hoping that it's a 8 dollar can of contact cleaner fix and a 5 dollar tube of silicone for prevention.

 

So no luck with the rice. Like I said, no other pins other than 2 are shorting to ground like I'm getting at the fuse, but I am showing dead short across pins 4 5 and 6 to each other. Is that normal? Just want to make sure before I run to the dealership for a new controller tomorrow

 

had to order the unit so it'll be here this weekend. I still would like to know if the wires at pins 4, 5, and 6 are supposed to read short across each other with a full tank of gas (are they float switches or something else). I'll know either way by Sunday, but it would help relieve some stress knowing that I don't have to pull absolutely everything off the underside rear of my vehicle just to troubleshoot.

 

j

where is the fuel controller located? I think mine has failed.

 

under the liner for the spare tire towards the back the second row seats to the right looking forward.

Anyone know if there has to be reprogramming done after these are changed? Changing fixed my startup issues but still getting CEL for "low startup pressure" that I wasn't getting before the old one crapped out. I ebayed a used one so I'm not sure if it's supposed to be plug and play 100% on a change or if I got a bad one or if they have to be programmed.