Map sensor circuit malfunction dtc

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Mar 29, 2020 | 05:59 AM

#21

Vauxi

Senior Member

Joined: Jul 2019

Posts: 806

Likes: 170

From: Finland

I answer to myself. AJ27sc ROW engines does not have MAP until VIN F20xxx . Interesing to see is what does ecu complain if I block egr. I assume it measures the amount of egr flow by mafs flow drop.

Jul 28, 2023 | 02:08 PM

#22

FriendlyJagXJ8L

Junior Member

Joined: Oct 2022

Posts: 16

Likes: 1

From: Florida

Quote:

Originally Posted by johnleavitt

For the next guy who has this issue,

I got a cel, and pulled a map sensor circuit malfunction code. The car ran fine, so it seemed, but I did notice a 20 percent decrease in fuel economy. l looked at the stored data in my obdii reader to see that the map sensor showed 27.2 inhg, with no change due to rpms.

I looked for the map sensor to no avail, but came across a detached vaccuum line to the rear of the engine. It was fixed with a small clamp. There are a few electrical switches attached to the firewall, one of which has a nipple for a vaccuum line. I hooked the line up, and checked the reader data again. The cel reset, and life is good. I guess the switch the vaccuum line hooked up to might be the map sensor. I don't know and don't care......

Having similar issue X350 here don’t kick me out! Have a S type with the 4.0… close enough?
But I think this will help me when I go back out to check out more I know just simple air leaks can cause huge headaches I wonder if something isn’t attached in the very back, let me go squeeze my big head in there shortly 😂