I have a 1995 Ford Contour. I've been trying to figure out what's
wrong with for about a week now. I've replaced a ton of components,
tested a ton of them as well, but nothing is working.
Anyways, I noticed that my PCM is not giving me any codes...even when
I disconnect the MAF Sensor, or IAC, etc.
How can I not be getting a CHECK ENGINE light as SOON as I am
disconnecting an important sensor!!!???? Is my PCM shot??
It does not light up the check engine light as soon as you unplug a sensor..
hell i had my o2 sensor unplugged on my 1994 dodge spriit for a whole day
and it still didnt come up with a failure. People rely on the damn
computers in the car to act too fast... it likely writes a code to its
memory that the sensor failed... but it may take 20 or 30 small failures to
cause a check engine light... I do not know how their code was written this
is only what i assume.
OBD II systems often require several logged failures before the MIL is
illuminated (depending on specific fault indicated). EEC-IV is not OBD II
compliant, but I would suspect that it may follow the same pattern. Those
older ECMs aren't necessarily the greatest anyway, as they lack monitor
routines, ie, they don't have active sanity checks for the associated
components. Furthermore, if one is (dis)connecting components before the
ECM enters closed loop, it possibly won't log anything anyway, at least
not to the point of illuminating the MIL. Disconnecting the MAF should
make it pretty much run like shit however, and probably stall, regardless
of loop mode. It should be requisite (along with CMP and CKP) for the PCM
to follow its default fuel map.
On Sat, 17 Jan 2004 06:30:52 -0700, Ken Gallo Jr wrote:
remove 'spamsucks' from mail addy for replies.
I fart in Darl McBride's general direction.
On 16 Jan 2004 21:57:32 -0800, email@example.com (good4u) wrote:
What's the original problem?
When you turn the key from OFF to RUN (not start) do you hear the fuel pump
run for a few seconds? Does the "Check Engine" light come on right then?
If the ECA's not coming on, it's not going to check anything.
Not at all. If you don't see the "Check Engine" light come on when you turn
the key from OFF to RUN, (it's not a code, it's simply telling you that it's
"booting up" so to speak), and hear the fuel pump run for a couple of seconds,
then it's likely the ECA/EEC-IV isn't turning on. If it's not on (and there's
a sequence of events that occur to turn it on) then it can't go out and get
check the state of the sensors.
Like your PC, if it's not on, you can't tell if the keys on the keyboard are
Get back to us after you've hooked everything back up.
You give us symptoms, we'll come up with some things to check for.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.