Still have not found the problem, still get 'no bus' and no start.... plugged a scan tool in and got a p1389 a p0443 and p1698
checked/cleaned all the grounds i could find, any ideas?????
---- OriginalMessage ----
>From: "TerribleTom" <silvereightynine@aol.com>
>To: dakota-truck-moderator@bent.twistedbits.net
>Sent: Tue, Jul 12, 2011, 09:06 PM
>Subject: Re: DML: RE: pcm?
>
>
>On 7/12/2011 2:45 AM, Tony wrote:
> >
> >
> > Cranks fine, it ran before he powerwashed it...
> > doubt any spark, didn't check since still NO BUS error,
> > prior to new PCM, relays didn't click, 0Volts to crank,Cam,MAP
>sensors. basically nothing.
> > new PCM, everything comes on, fuel pump cycles on as normal, have 5V
>at all sensors now, but still NO guages and NO BUS. I checked the ground
>on fender near PCM, is there another problem one?
> >
> > thanks!
>
>Speaking from a matter of experience when it comes to trucks with
>abnormally high moisture activities... it sounds like something shorted.
> "Thanks Captain Obvious"... you say... cause and effect... the fact
>you toasted the PCM leads me to declare "effect" not cause. You are
>still searching for the cause of what fried the PCM.
>
>As the PCM interacts with just about everything under the hood - you
>have a large task ahead of you. You are getting voltage at the sensors,
>good. I suspect the sensors are good. If say you just had a bad crank
>sensor and it wasn't triggering a signal when the engine cranks, - I
>would say replace the crank sensor. But because there is the NO BUS
>error - methinks something directly shorted out between the PCM and the
>dash.
>
>Am I correct in assuming the NO BUS error is showing up on the
>dashboard? I remember seeing that pop up when I would hook up my power
>programmer to the OBDII port on my Ram.
>
>I would check the bulk head connector that bridges the harness at the
>firewall. I suspect you have a bad connection between the cab and the
>engine bay. It would explain the NO BUS error on the dash, it would
>explain the lack of working gauges, it would explain the no start condition.
>
>The bulkhead connector was a known issue on older Daks - no I'm not
>talking about the splice of death issue from the Gen II's... The
>bulkhead connections are weather proof - but not completely water proof.
> Under the force of a pressure washer - its possible water got in there.
>
>If no obvious signs of trouble is at the bulkhead connector - you are
>going to need to check wires individually to determine if there is an
>open circuit. I also am not sure if the later Gen III's used fuseable
>links - a check with an FSM would elaborate on that.
>
>Regardless - my money is on a flakey or shorted connection at the firewall.
>
>--
>terribletom
>
>
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