Diacom reports 23 battery volts?

[Programmer]

I've seen as high as 48 volts off a bad alt in a running Olds 88 with a
3.8L...it can happen--and
not fry the PCM. I don't know how--but I've been there.
Lyndon
-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: August 29, 2000 1:44 PM
Subject: Re: Diacom reports 23 battery volts?


>Also, seen shorted diodes put enough a/c into system to do screwy things
>Bruce
>
>
>> Measure the voltage at the ALDL with the car running. I've seen this
>problem
>> when
>> two fusible links are improperly repaired...but voltage regulation could
>be
>> toast, too.
>> Lyndon.
>> -----Original Message-----
>> From: Jim Sloan <leroy at sunflower.com>
>> To: gmecm at diy-efi.org <gmecm at diy-efi.org>
>> Date: August 29, 2000 10:55 AM
>> Subject: Diacom reports 23 battery volts?
>>
>>
>> >My dad called and said his car wasn't running right and the check engine
>> >light was on. It is a 91 Cutlass Ciera with a 3.3L.  I hooked up Diacom
>and
>> >checked the trouble codes. The current code listed high battery voltage.
>> >History showed high battery voltage, tps sensor out of range and esc
>> >malfunction. I started the car and Diacom showed around 23 volts!
Voltage
>> at
>> >the alternator was 14.5. I checked the inputs at the ecm and didn't find
>> >anything over 13.  I think his ecm is toast.  Anyone else had a similar
>> >problem?
>> >
>> >The ecm number is 16159274. Memcal AXAT9713. I can post it to incoming
if
>> >anyone can help me identify the eprom.  I think it's a 27C256.
>> >
>> >TIA,
>> >
>> >Jim Sloan
>> >leroy at sunflower.com
>> >
>> >
>>
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