ECM Fault?

[Programmer]

I know a bad EGR can set MAP codes--never really thought a MAP would then
be responsible for setting EGR--that's why I was sure the PCM looks at
integrator change over a set time value...I chased one of these in a 91
Firebird for a couple days--intermittent CD32--turned out to be a backspike
from the TCC solenoid <g>. Added a diode to the harness and voila...

Lyndon.
-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: December 8, 1999 4:19 PM
Subject: Re: ECM Fault?


>
>----- Original Message -----
>From: Programmer <nwester at eidnet.org>
>To: <gmecm at efi332.eng.ohio-state.edu>
>Sent: Tuesday, December 07, 1999 4:25 PM
>Subject: Re: ECM Fault?
>
>
>| Is it MAP change or integrator change that the PCM looks for ??
>
>That's an interesting comment,  I've heard that it actually is looking for
>an integ number change, yet, it took a fairly large change in a resistor
>divider not to trip it, AIR
>Grumpy
>|
>| Lyndon.
>| -----Original Message-----
>| From: Bruce Plecan <nacelp at bright.net>
>| To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
>| Date: December 7, 1999 9:53 AM
>| Subject: Re: ECM Fault?
>|
>|
>| >This maybe off subject, but an interesting note, if at EGR apply there
is
>| no
>| >map change I got a code for EGR, malfunction (747, SBC).
>| >Grumpy
>| >
>| >
>| >|
>| >| Regarding your other message, the ECM doesn't look for a MAP change as
>| >| part of the closed loop logic.
>| >| |
>| >
>| >
>|
>
>