P1237 codes found a solution!!!

[Patrick Cayton]

My 06 Mercury mountaineer died on me a few weeks back. First I got a fuel pressure sensor code. Changed that. Then came up with a p1237 code along with p1000. And temp sensor code. Did alot of research and found out that the fuel pump driver module runs on a ground pulse not a positive signal. Found that I had a bad connection

 

[Patrick Cayton]

I also changed the fuel pump thinking that was the problem. As I wasn't getting any fuel

 

[Patrick Cayton]

$300 down the drain

 

[Patrick Cayton]

After fixing the connection all codes went away

 

[07EddyB]

Good job - which connection was bad - was it back at the pump?

 

[Patrick Cayton]

No. I had an after market hitch and brake controller added. They spliced in at the connector right below the right rear tail light. The connection corroded and broke.

 

[Patrick Cayton]

Before you throw parts check for power and ground. The fuel pump driver module runs on a group pulse not positive. If you have a bad group it will not give signal back to the pcm.

 

[Patrick Cayton]

My bad connection was at the connector under the bumper straight below the right rear tail light. There are 2 plug ins there.

 

[Patrick Cayton]

The larger one goes to the right tail light assembly and fuel pump module. The smaller one goes to the back up sensors and left tail lights

 

[Patrick Cayton]

I would like to thank scanner danner's videos for my fix. I'll try to link the one that helped me with this problem

 

[07EddyB]

OK - so an aftermarket install was the cause. Still good to know.

You have a very unusual posting style

 

[Patrick Cayton]

Sorry I am new to this. What i have researched is that the fuel pump driver module runs on a group pulse. Which means that it gets power all the time when the key is on. If there is a bad ground. The pump will not run. You need to check both power and ground before the pump before you rule out the pump as being the problem. That was my situation. I had a bad ground coming from the fuel pump driver module. That was broken. So I wasn't getting any power to the pump.

 

[Patrick Cayton]

Scanner danner's videos is what put me in the direction to find my problem. Sorry if it is out of the ordinary for this feed

 

[Patrick Cayton]

I spent$200 on a new pump before researching. My dumb luck.

 

[07EddyB]

No problem - good info to share. What I meant by your unusual posting style is how you make multiple posts within a few minutes of each other rather than putting everything in one post. It's useful for building your post count but not much else.

 

[Patrick Cayton]

And $110 on fuel pressure sensor

 

[Patrick Cayton]

Sorry. Didn't think of everything at once. Been a long week

 

[Patrick Cayton]

Not looking to get a post count. Just sharing what I have found out so someone else can benifbe from it.

 

[Patrick Cayton]

$300 to fix a 5 minute problem. Can go along way

 

[Patrick Cayton]

Everyone should check out scanner danner's videos on non return less fuel system on ford. It gives alot of information on our problems