Codes P203 - P2146

[jelag]

I've owned this truck since it was new.... now getting codes P0203 Fuel Injector 3 Circuit & P2146 Fuel Injector Group 1 Supply Voltage Circuit

The engine started to run rough less than 1/10 mile ago and the check engine light came on... using my scan tool I retrieved the 2 codes.... but it seems to running rougher than just 1 cylinder down????

Several questions... (1) is this the 3rd injector in line on the engine or is this firing order #3? (2) is this a simple pull off the valve cover and ohm out the solenoid on the injector when its isolated and most of all is this the most common failure?... (3) if this is the solenoid can the solenoid be changed with the injector in the block?

Background... injectors were changed out.... 3 summers ago with factory injectors... now maybe an additional 30K miles on the new injectors... the fuel system has both a 10 micron & 2 micron secondary filter added to the frame since the truck was new.... no other engine problems or under hood issues in the past 3 years...

Thanks for the insight....

Jim

 

[AH64ID]

Injector #3 is cylinder #3.

I would guess that that P0203 is causing the P2146.

Here are the FSM files.

View attachment P2146.pdf

View attachment P0203.pdf

 

[jelag]

John....

Wow.. was sitting on the patio here in AZ and thinking of you.... fired up the computer and here is a reply to my post... THANK YOU..... so I'm looking at the P203 test... and in step 3 its talking about pulling the C2 PCM and pin K13... I assume this is the path to injector #3.... and that a ohm test from pin K13 to ground would test the wiring and ohm out the solenoid.... UPDATE... I read a second time through the menu... this won't work.. I need to find connector K13... or open the valve cover....

I assume that the connector that they are showing is under the valve cover for the connection to the injector... (small plastic connector) or is this in the engine compartment and I just have never noticed it...

I'm also wondering if the solenoid can be changed without removing the injector?

I will also need to read my scan tool manual to verify I can toggle on/off the injector... that is something that is to be part of the software/firmware in my scan tool... yet I've not used that function....

Thanks.... Jim

BTW - please feel free to chime in here... jelag at msn dot com

 

[AH64ID]

The connection should be outside the valve cover. There are 3 square (4 wire) connections on the driver side of the cylinder head just above the injector tubes.

I have heard you can change just the solenoid but I don't know if you can do it in the truck or not.

 

[PWong]

Injector #3 is cylinder #3.

I would guess that that P0203 is causing the P2146.

Here are the FSM files.

View attachment 94790

View attachment 94791

The P0203.pdf was not for diesel.

 

[AH64ID]

The P0203.pdf was not for diesel.

Shoot. Let me see about fixing that. I thought it looked funny but I was in a hurry.

 

[jelag]

John... your right about P0203.pdf... but it was close enough to get and idea of how it works/functions... my pacbrake compressor was in the way of actually seeing the electrical connections.. appreciate your thoughtfulness....

UPDATE.... Pulled the valve cover... solenoid on #3 open... not grounded... checked related wiring and all seems to ohm out correctly....
One bolt that holds the injector down was loose... but there didn't seem to be any carbon migrating around the copper washer... don't have a clue why not... the quill (my term) was clean and I was able to work it loose with my fingers and remove it before pulling the injector.. Called the Snap-On guy for the tool.... CJ149 but he never returned my call.. and I didn't need it anyway...

I had to ORDER grommets for the valve cover... and the breather tube... (rubber nipple is hard & brittle) neither are in stock here in town... Southwest Diesel (Phoenix) will work in (1) injector for a test, repair, test... tomorrow while I play at the home show... (60 miles one way) Southwest has had good customer service in the past...

so I put some saran wrap on the common rail with a finger off an exam glove... and also covered the top of the engine with saran wrap and a heavy towel... all should be good until Sat. am when I get back to put it back together...

Q - Do I need to worry about any engine oil that might leak down into the combustion chamber while the injector is out??

 

[AH64ID]

I wouldn't worry about the oil it will burn off pretty quick.

The pdf is fixed now.