The relay has 12 volts applied to one side of the coil with the ignition
on. When you jump F/P to GND you are taking the other side of the relay
coil straight to ground bypassing the transistor. Normally the
transistor performs this grounding function (sinking current). T2 also
interacts with other circuity in the MAF box.
This happened to me about 4-5 years ago on my '92.
Mark
On 07/13/2012 10:00 AM, Eric McCord wrote:
When I jump out the F/P to GND the pump stays on but I still have the
same symptoms. If that transistor drives the relay but I jump it out
should that not run?
Eric
On Fri, Jul 13, 2012 at 9:54 AM, Mark Phillips
<[email protected] <mailto:[email protected]>> wrote:
Hi Eric,
I sent this out earlier but didn't see it repost. I apologize if
its a repeat.
There is a transistor in the Link box that replaces the AFM; it
drives the fuel pump relay. It is an NPN transistor, is marked
"T2" and may have failed. About $1.50 and a soldering iron to replace.
Mark Phillips
On 07/13/2012 09:40 AM, Eric McCord wrote:
I just swapped out the CAS and same symptoms. If it's a bad MAF
box where can I get one of those? Since my Baja went down the
Miata has been my only transportation and Kaitlyn and I are
leaving in a week and a half for the dragon and our road trip.
Eric
On Fri, Jul 13, 2012 at 9:18 AM, Ray <[email protected]
<mailto:[email protected]>> wrote:
Can also be that one of the two signals from the CAS is not
there.
*From:* Eric McCord <mailto:[email protected]>
*Sent:* Thursday, July 12, 2012 6:21 PM
*To:* [email protected] <mailto:[email protected]>
*Cc:* [email protected]
<mailto:[email protected]>
*Subject:* Re: '91 fires, won't stay on...
Just checked that connector. It looked fine, I reseated it
and still have the same symptoms.
Eric
On Thu, Jul 12, 2012 at 9:07 PM, [email protected]
<mailto:[email protected]> <[email protected]
<mailto:[email protected]>> wrote:
Have you checked the manifold pressure connection (heck!
I think that's what its called - I can't remember!) ?
If it comes loose, it may begin to fire and then die. On
mine its the small box with the AFM-like connector
(multi-pin) on the driver's side.
LGO
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