[V8] ECU grounding, etc. (abridged)

[Coleman, David]

Cute.  Yeah truth told I've been navigating around the TPS because, in
my experience, the TPS never needs to be adjusted.  And with other
sensors failing the output check, I think I'm looking at a more central
issue.

That said, I've checked all the other sensor outputs -- may as well
check this one as well...

-dc-


> -----Original Message-----
> From: Jeremy Ward [mailto:jward.v8 at gmail.com] 
> Sent: Tuesday, October 11, 2005 2:45 PM
> To: Coleman, David; v8 at audifans.com
> Subject: RE: [V8] ECU grounding, etc. (abridged)
> 
> Before you use the Holy Hand Grenade of Antioch, consult the 
> book of armaments - Chapter 24, Verse 470-1 "Throttle 
> Position output signal checking"
> 
> 
> 
> -----Original Message-----
> From: Coleman, David [mailto:David.Coleman at blackrock.com]
> Sent: Tuesday, October 11, 2005 11:25 AM
> To: Jeremy Ward; v8 at audifans.com
> Subject: RE: [V8] ECU grounding, etc. (abridged)
> 
> Gents:
> 
> So ECU terminal 54 still has no good ground as stipulated in 
> the manual, and jumping it to ground makes no difference in 
> the running condition.
> As Jeremy pointed out, the wiring diagram does indeed 
> indicate that 54 seems to jumper off 19:
> 
> http://www.sjmautotechnik.com/trouble_shooting/v8_pinout.html 
> 
> And no, I don't have continuity between the two at the 
> connector (good ground at 19).  The thing is, when I trace 
> the brown #54 wire from the ecu harness connector, it runs up 
> the loom and splits off among a small cluster of other wires 
> and leads to the first of five black plastic harness 
> connector boxes mounted to the firewall behind the ECU mounting area.
> 
> And the thing after that is, whatever these black boxes are 
> (each about the size of a thumb, mounted parallel to one 
> another), all but the one that the #54 brown wire cluster 
> goes to have two halves, sandwiching an in-cluster and 
> out-cluster.  The first one has no other half, i.e. it's a 
> dead end.  WTF?
> 
> Could this connector box be for automatic transmission 
> controls?  If so that might render terminal 54 as not 
> requiring a ground if the car's a manual trans...(?)
> 
> Thanks for any thoughts!
> 
> DaveC.
> 
> > + Car starts only after a few 1-second cranking sessions.  
> Won't start
> > w/ extended cranking.
> 
> > + Once warm, idle begins to fluctuate wildly (0-1500 rpm) 
> until engine
> > dies
> 
> > + Engine will immediately bog down trying to kill the motor if
> > anything close to WOT, either revving or driving.
> 
> > + Car runs WAY too rich, in all running/driving circumstances
>  
> > I've replaced the FPR and spark plugs.  From there:
> 
> > + Code consistently shows 2324 (bad ECU ground, MAF wiring)
> 
> > + Running diagostic output tests indicate all injectors click, ISV
> > actuates, but carbon canister solenoid no good
> 
> > + Replaced canister solenoid and associated vac hose clamps,
> > now clicks away during output tests.
> 
> > Checked ECU:  
> > + ECU voltage supply check asks to confirm ground at 
> terminals 10, 14,
> > 19, 24, and 54 of the harness connector ---  All were good 
> except at 
> > 54.
> 
> > + I also picked back up on the MAF sensor check procedure, which was
> > asking to verify continuity between ECU harness connector pins 19 & 
> > 37.
> 
> > No good.  Blames an apparent short between ecu pin 37 and 
> terminal #5 
> > of the MAF sensor connector.  So far no luck finding a short...
>  
> > So the upshot is: how does terminal #54 of the ecu harness 
> connector 
> > get its ground?  Any other thoughts?
> > 
> > Delirious in Delaware,
> > 
> > DaveC.
> > '91 V8 5-speed
> 
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THE INFORMATION CONTAINED IN THIS MESSAGE AND ANY ATTACHMENT MAY BE PRIVILEGED, CONFIDENTIAL, PROPRIETARY OR OTHERWISE PROTECTED FROM DISCLOSURE. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution, copying or use of this message and any attachment is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and permanently delete it from your computer and destroy any printout thereof.