Oh and no sign of issues with bulkhead connector...:(
---- OriginalMessage ----
>From: "Tony" <tony@tasteofthemidway.com>
>To: dakota-truck@dakota-truck.net
>Sent: Mon, Aug 08, 2011, 07:38 PM
>Subject: DML: RE: pcm?
>
>
>
>
>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
>>
>>
>
>
This archive was generated by hypermail 2b29 : Sun Sep 04 2011 - 20:19:53 EDT