I listed these in another thread, however I have not gotten any response, so I will try individually. The first go around I did not realize I had a 3 digit code output.

I have a bad EGR, and I don't think it would give me this code. The first code KOEO is a 111, so it makes me think that this is a continuous code.
542 says fuel pump circuit open pcm to motor. I was going to say that both pumps work, however my daughter has had truck and I just got it back and went to work. I know that before the sending unit on front tank quit working and that pump is maybe 4 years old. Maybe it is the problem, but with the selector switch to the rear tank how would ecu know if one or the other was bad?

I have several more codes. The computer itself is maybe a year old.

I may not be as concerned about this one as I am some of the others, but a code free truck would be nice.

Mike

 

A code of 111 can be received from KOEO, KOER, or CM, and it means no error (system pass). A 542 code comes from KOEO or CM, and is from secondary fuel pump circuit fault. The computer knows the pumps are bad if it is getting a reading it doesn't expect or no reading at all when it should. It could be as simple as a broken/bad wire, fuse, or a bad sensor or pump unit. The trick is that you have to do these tests right in order to get proper results. In other words, before you begin, check all fluid levels, air cleaner, belts, linkages, rubber and steel hoses, spark plugs and wires, battery terminals, and mechanically sound (compression, engine vacuum, timing, etc).

 

What I know is plugs and wires have really low miles on them. Timing is good. There could be some bad ground connections, but none making weird things happen. It is old. I had a friend watch as I cranked. The compression seemed to increase in 30 psi increments to around 120. I have one vac line that comes from what I will call fuel vapor canister that could be bad, however I see no gaping holes. Would a bad sending unit give this code?

This may not be the worst of my codes, I have 3 more listed under electrical.

 

This very well could be a sending unit, and the only way to know is by testing. By the way, the 542 code is between the PCM and ground somewhere. A 543 code is an error for the fuel pump between the engine and PCM. Also, you have to do the KOEO tests first and fix anything tripping a code before moving to the KOER. If you don't, you might get bad code readings. You MUST have a "111" before moving on. Then in KOER, there are times when you need to do certain things (like depress throttle all the way down), or you will get codes. So you might have codes because it wanted you to do something and you didn't. What other codes did you get?

 

I posted other codes in electrical. I had a 332 for EGR. I know it is bad. That was koeo. I did not know about correcting things before doing the engine running test. However koer I got a 311 Thermacror air sys inop (right side) 213 spout circuit open, I think 225 knock sensor not detected. I had gotten 2 more codes one for brake switch ( I did not press and release brake and one for transmission I think because I did not press and release OD switch.

By the way thanks for your time and teaching.

I suppose I need to start by replacing the EGR and checking and cleaning ground connections and even battery terminals.

 

I only recently acquired a code reader and book for the truck. Turns out code reading is not as simple as counting flashes. You have to do certain things or you could get errors. I strongly encourage the $23 investment rather than guessing.The code 332 is only KOER or CM. By the way, these codes might not be valid, depending on how you ran the tests. You might be chasing ghost codes. Here is the link for my code reader; make sure it applies to your truck before buying: INNOVA 3145 Ford Digital Code Reader https://www.amazon.com/dp/B000EW0KHW..._O3YwxbMSYQM15

 

Also, I wouldn't just start replacing components without verifying what is causing the fault. A very smart guy on here has taught me that diagnosing the fault is important rather than just buying parts and hoping. That can be pricey. In my opinion, the actual code reader and the book it comes with are tremendous assets to at least pointing in the right direction. Good luck!

 

The 332 I believed CM. The very first code was a 111. I've had this truck a few years and have just now really started doing things to it. I had pulled upper plenum so as to remove injectors for cleaning and had noticed that someone had plugged the EGR port on plenum. I pulled vacuum on EGR and could not get it to change states. I have an obd-ll reader. Didn't really think I would need one for the obd-l. I may be wrong.

I guess I am going to start by cleaning grounds and looking for any other obvious.

 

I replaced the EGR and the CEL is not coming on anymore. I have not yet checked to see if there are any codes even though no light.

I decided to replace my pan gasket instead. I should have remembered from my E350. Pull the upper plenum first other wise not enough room for the pan to clear tranny.

 

Awesome! Congrats; glad it's worked out!