Hi Jon,
I stand corrected. The 8v is the PCM power supply circuit. Both the 5v and
8v circuits are stepped down by the PCM. Origination is the 12-14v battery
circuit input from the PDU. If your CKP sensor shows 14v then the initial
14v circuit has not been stepped down. One might conclude that the PCM
might be fried. That being the case, one might want to check all components
using that 8v circuit to see if the extra voltage might have hurt them,
including your CKP sensor. You might want to check the circuit input for
the CMP sensor as well and see if that's 8v. What sounds strange is what
you say happens when you put the MP PCM online. That leads one to believe
that something in your PDU might be overpowering the PCM to begin with. The
only thing that can put out more power than the battery is an alternator
whose power regulator might have gone belly-up. Keep us informed on what
you find.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile (URL follows)
http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of Jon Smith
Sent: Wednesday, November 06, 2002 4:13 AM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: DML: Re: RE: RE: Dead Dak
There are 5v and 8v reference signals used by the PCM. Crank sensor gets 8v
;-)
> On second thought, why do you have an 8v wire going to the CPS? It should
> be no more than 5v. I think you need to check that entire 5v circuit. It
> starts out as battery voltage, 12-14v, but should get stepped down to no
> more than 5v.
>
> Ron
> 00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
> For modifications see my DML Profile (URL follows)
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:47:24 EST