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P0231 code/truck broken down

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Old Feb 14, 2021 | 04:29 PM
  #16  
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Originally Posted by udsuth78
Before I dropped that kind of coin I'd at least check if the pump is getting power and how much. Ironically I had a fuel pump problem myself yesterday. Truck was idling in the drive warming up and I heard it go to high idle then nothing. I cycled the key no hum from the pump or pressure on gauge. Immediately reached for the multimeter. Voltage was good ended up being a bad connection.
@udsuth78 what connection ended up being bad? Right at the pump? I want to keep an eye on this as well.

RigCity - glad to see you got her going. If I had an '02 and was faced with that price, I would do something similar to what you did, or figure out how to replace/repair the relay hidden in that module.
 
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Old Feb 14, 2021 | 06:46 PM
  #17  
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In the thread below, there is an ebay service that will replace the relay for quite a bit less than a new (or used) module. Not sure if he is still at it for our rigs, but I see he has current repair listings going.

What you did, RigCity, is going to be the most economical, but maybe long term, this is an option to try.

https://www.ford-trucks.com/forums/1...l#post16808071

Here's another option for repair.

https://circuitboardmedics.com/2003-...se-box-repair/

Anyone have a picture or part number of the relay on the board?

 
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Old Feb 14, 2021 | 07:19 PM
  #18  
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Not sure if this is what your central junction box looks like for an '02, so take the following with a grain of salt. I was looking for the relay for those that might want to tackle the job.

https://www.ford-trucks.com/forums/1...-location.html




Omron relay
 
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Old Feb 14, 2021 | 08:49 PM
  #19  
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Originally Posted by BWST
@udsuth78 what connection ended up being bad? Right at the pump? I want to keep an eye on this as well.

RigCity - glad to see you got her going. If I had an '02 and was faced with that price, I would do something similar to what you did, or figure out how to replace/repair the relay hidden in that module.
I've converted to an in tank pump so I doubt it would apply to most here but it was the positive at the hanger plate where the wires go into tank. When I installed the pump I used insulated blade connectors which I solderer and heat shrinked, but the female side of the connection got loose some how or other and wasn't making good contact. Now it's a 2 pin weather tight plug so shouldn't have any more trouble from it.
 
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