I recently got my AE software & as I was learning to use it I was running a few tests. The other night coming home from work my truck briefly threw the CEL, ran rough for a few seconds & then cleared up. I've had this occur a few times since then but its run a LOT rougher, almost like its on one bank. I pulled the codes, got the P-1316, so I did a buzz test & got the P-0264 code -Cylinder 2 Injector circuit low

[IMG]<a href="http://s950.photobucket.com/albums/ad344/ghig1967/?action=view&amp;current=0410111233.jpg" target="_blank"><img src="http://i950.photobucket.com/albums/ad344/ghig1967/0410111233.jpg" border="0" alt="Photobucket"></a>[/IMG]

A little over a year ago, I had similar issues & pulled the drivers side valve cover to find the UVCH loose & I did the 25 cent mod & haven't had any issues since... I assumed this was my issue again, figuring it may have worked loose again. I took it apart to find the UVCH plug was indeed worked a little bit loose. I took it apart and reattached the plug.. ran the buzz test again to find I still had the P-0264 code...

I thought I would try & start it to see if I could see anything.. it started up, ran rough for a few seconds & cleared right up.. I took this video..

YouTube - MOV01958.MPG

I shut it off, did a buzz test again & STILL have the P-0264 code.. Any ideas?? Also, does everything in my video look normal?? (besides the thin piece of twine I see fell between the 2nd & 3rd injector)

 

Did you check the center pin of the valve cover and harness?
https://www.ford-trucks.com/forums/1...l#post10168556

 

Nope. I'll go check that now. I've been sitting here trying to search to find what this code means.

 

I just pulled the whole VC gasket out.. All the pins look good, nothing appears burnt.. What else should I be looking for ???


This just figures, its 78 degrees out, the nicest day we've had in 2011 .. thunderstorms tomorrow & no higher than 60 all week & i've got to be fighting with this when I have a TON of spring yardwork to do & about 3 cords of firewood in my driveway that needs split & stacked... But my truck is my DD, so I need to figure this out......

 

Here is some info from the service cd: NA1 DIAGNOSTIC TROUBLE CODES (DTCs) P0261, P0264, P0267, P0270, P0273, P0276, P0279, P0282
DTCs below indicate a low side ground short in the between the IDM and the injector. The following table lists the to inspect while performing these pinpoint tests, based on the DTC retrieved during the KOEO On-Demand or Injector Electrical Self Tests.

Cyl. DTC
1 P0261 555 (TN)
2 P0264 556 (WH)
3 P0267 557 (BN/YE)
4 P0270 558 (BN/LB)
5 P0273 559 (TN/BK)
6 P0276 560 (LG/OG)
7 P0279 561 (TN/RD)
8 P0282 562 (LB)

I would check the wire bundle going over drivers side vc the wires can rub on it.

You could also check the resistance of the injectors solenoids (look for consistant reading testing at the 9 pin plug of the vc between I and C)

G - G - I - I - C - I - I - G - G

G = glow plug
I = Injector return
C = Injector common feed


You could also clean your connections at the vc 9 pin plug, 42 pin connection, and idm connector with some electric parts cleaner then use a little dielectric grease on the connections.

If you want to check from the idm to the injectors this pdf should help out.

If everything else checks out it could be your idm.

 

Have you ohm'd out the harness? I had one once that read really high ohms compared to the others. I think it had to do with oil getting into the potting compound in the UVCH cover area. When I took everything apart the ohms were normal. You may need a new harness.

 

Grant.. I checked the harness's & they are all still inside the black corrugated cover with no apparent wear thru spots.. Resistance at the 9 pin connectors were @ 3.8 for all 4 Injector returns.. I sprayed electric cleaner in both ends of the 9 pin plugs & the VC gasket female ends. The plug under the harness was out a little bit when I 1st took off the VC. I cleaned the plug up & reinstalled teh 25 cent mod..When I was doing my tests afterwards, it was with the big plug on the 42 pin connector just pushed together & the bolt was not tightened. I just buttoned the VC back up, tightened the 42 pin connector & did 2 buzz tests & they came back normal... Would the P0264 code keep showing up on the buzz test until I clear it ?? I thought maybe the 42 pin being loose was part of my problem earlier when I was testing, but I doubt it would still throw the same code ???/

The other baffling thing is, that when it was acting up.. it ran REALLY rough & smoked like crazy. I don't really understand how this all works.. Does this code show a problem with cylinder 2 only? Cause when it was throwing the CEL, it sure sounded like it was only running on one bank & was running horribly.


Ken.. Which harness are you refering to? I did check the wiring between #2 injector & the 9 pin connector @ the VC & it seemed ok.. I really didn't go any deeper in my investigation since I couldn't find diagrams that showed me how those wires tied into the 42 pin connector. I know the IDM is supposed to be near the fender somewhere, but I didn't look that far yet. I'm going to finish putting everything back together & see what happens since my last 2 buzz tests came back ok..

Of course, while taking this all apart..I did find another thing that appears to be an issue... The foil coated IC pipe had some seriously gnarly rub marks on it where the bracket for the PS pump mounts rubbing bad against it... I'm not sure what the issue is there.. So much for spring yard clean up today...

 

Sorry, left off UVCH from my harness question.

Yes the code will stay until you clear it! A loose 42 pin connector could easily cause the problem you had. # 2 injector may have a slightly recessed pin or socket in that connector or it just was out a hair further than the others. Good thing to find loose versus something broken!

 

Well, I buttoned everything back up & cleared all the codes. I ran a buzz test & a cylinder contribution & both passed. I picked up all my tools, closed the hood & got in to start my truck & sure enough, it threw the CEL & ran like crap for about 10 seconds.. then cleared up. I shut it off, checked & had the 1316 code again.. so I did the buzz test & sure enough.. had the 0264 back.. I cleared the codes again, started it up & it ran fine.. I ran a few other tests & it was still ok. I decided to change directions for a while & changed out the dark grey CPS (purple o ring) & put in the new black CPS I just got from Clay. I started it up & it was running ok & smoother than before so I ran the cylinder contribution, then shut it off & ran a buzz test.. all of them passed. I then decided to tempt my fate & go for diesel.. drove about 10-12 miles & it never missed a beat..

I'm sure this isn't over yet & this problem will rear its ugly head again. I decided to throw in the towel with this issue & at least get my grass mowed & spring fertilizer down before it got dark. I'm sure chapter 2 to this story will come soon.

I'm still trying to grasp what this all means though. P0265 says Cylinder 2 Injector circuit low. So I assume that means I have a short in the wiring for Injector 2 right?? But why does it act like the whole bank is not firing when my CEL light comes on then?? I guess to narrow this down I need to ohm check the harness from the VC gasket to the injectors?? And then the VC gasket to the IDM?? Or do I check it from the VC to the 42 pin harness & the next step 42 pin to the IDM??

 

According to the service CD:
If a low side short to ground condition is determined by the IDM, this condition will be transmitted to the PCM via the EF signal. The PCM will enable the CHECK ENGINE light and command minimum fuel to the affected bank.



And some detailed diagnostics:


NA1 DIAGNOSTIC TROUBLE CODES (DTCs) P0261, P0264, P0267, P0270, P0273, P0276, P0279, P0282

• DTCs below indicate a low side ground short in the circuit between the IDM and the injector. The following table lists the circuit to inspect while performing these pinpoint tests, based on the DTC retrieved during the KOEO On-Demand or Injector Electrical Self Tests.
  
  <table border="1" cellpadding="3" cellspacing="0"> <tbody> <tr> <th valign="bottom" align="center">Cyl. </th> <th valign="bottom" align="center">DTC </th> <th valign="bottom" align="center">Circuit </th></tr> <tr> <td valign="top" align="center">1 </td> <td valign="top" align="center">P0261 </td> <td valign="top" align="center">555 (TN) </td></tr> <tr> <td valign="top" align="center">2 </td> <td valign="top" align="center">P0264 </td> <td valign="top" align="center">556 (WH) </td></tr> <tr> <td valign="top" align="center">3 </td> <td valign="top" align="center">P0267 </td> <td valign="top" align="center">557 (BN/YE) </td></tr> <tr> <td valign="top" align="center">4 </td> <td valign="top" align="center">P0270 </td> <td valign="top" align="center">558 (BN/LB) </td></tr> <tr> <td valign="top" align="center">5 </td> <td valign="top" align="center">P0273 </td> <td valign="top" align="center">559 (TN/BK) </td></tr> <tr> <td valign="top" align="center">6 </td> <td valign="top" align="center">P0276 </td> <td valign="top" align="center">560 (LG/OG) </td></tr> <tr> <td valign="top" align="center">7 </td> <td valign="top" align="center">P0279 </td> <td valign="top" align="center">561 (TN/RD) </td></tr> <tr> <td valign="top" align="center">8 </td> <td valign="top" align="center">P0282 </td> <td valign="top" align="center">562 (LB) </td></tr></tbody></table>
• Disconnect injector valve cover connector at the suspect injector.
• Measure resistance between suspect circuit of the engine harness connector and battery negative post.

Is resistance greater than 10,000 ohms?
<table width="92%" border="1" cellpadding="3" cellspacing="0"> <tbody> <tr> <th width="50%">Yes </th> <th width="50%">No </th></tr> <tr> <td width="50%">GO to NA2 . </td> <td width="50%">GO to NA4 . </td></tr></tbody></table> NA2 CHECK SHORT IN CIRCUIT TO GROUND

• Install Glow Plug Injector Adapter 014-00935 or equivalent to the valve cover gasket.
• Measure resistance between suspect circuit and battery ground.

Is the resistance greater than 10,000 ohms?
<table width="92%" border="1" cellpadding="3" cellspacing="0"> <tbody> <tr> <th width="50%">Yes </th> <th width="50%">No </th></tr> <tr> <td width="50%">Fault may be intermittent, GO to NA5 . </td> <td width="50%">GO to NA3 . </td></tr></tbody></table> NA3 UNDER VALVE COVER SHORT

• Remove valve cover and disconnect injector connector.
• Inspect under valve cover (UVC) harness for shorting to ground.

Is fault indicated?
<table width="92%" border="1" cellpadding="3" cellspacing="0"> <tbody> <tr> <th width="50%">Yes </th> <th width="50%">No </th></tr> <tr> <td width="50%">REPLACE UVC harness. RESTORE vehicle. CLEAR DTCs and RETEST. </td> <td width="50%">REPLACE injector. RESTORE vehicle. CLEAR DTCs and RETEST. </td></tr></tbody></table> NA4 CHECK FOR SHORT BETWEEN INJECTOR VALVE COVER CONNECTOR AND IDM

• Disconnect IDM harness connector.
• Measure resistance between respective injector circuit and all other circuits in the IDM harness connector and to chassis ground.

Is the resistance greater than 10,000 ohms?
<table width="92%" border="1" cellpadding="3" cellspacing="0"> <tbody> <tr> <th width="50%">Yes </th> <th width="50%">No </th></tr> <tr> <td width="50%">REPLACE IDM. RESTORE vehicle. CLEAR DTCs and RETEST. </td> <td width="50%">REPAIR short to ground between injector valve cover connector and IDM connector. RESTORE vehicle. CLEAR DTCs and RETEST. </td></tr></tbody></table> NA5 CHECK FOR INTERMITTENT SHORT TO GROUND

• Key off.
• Disconnect IDM. Inspect for damaged or pushed-out pins.
• All other connectors plugged in.
• Using a digital multimeter and the flex tips supplied with the scan tool, measure resistance between the suspect injector low side circuit on the IDM connector and battery ground post. Refer to injector illustration at beginning of this pinpoint test for pin location.
• Grasp the harness close to the suspect injector connector. Wiggle and shake harness while working toward the IDM.

Does resistance ever drop below 10,000 ohms?
<table width="92%" border="1" cellpadding="3" cellspacing="0"> <tbody> <tr> <th width="50%">Yes </th> <th width="50%">No </th></tr> <tr> <td width="50%">ISOLATE short to ground and REPAIR. RESTORE vehicle. CLEAR DTCs and RETEST. </td> <td width="50%">IDM internal failure, REPLACE IDM. RESTORE vehicle. CLEAR DTCs and RETEST. </td></tr></tbody></table>



Not sure if you understood where the wires commonly rub but it's the wires that touch the valve cover. You can see in this pic where I taped up the bundle and a pic of the idm circuit.

 

Awesome info, Thanks Grant !!! I'm off to work shortly & work 12 hours days for the next two (hope I make it) I'll do some further investigating Wednesday & hopefully I can get this problem solved.. Thanks again..