hello,
can anyone help me please.
past week i found somewhere on the internet an article about testing your ecm to see if its bad or not with an voltmeter.
but i couldn't find it anymore.
all information is welcome

grtz

You might be able to check a few individual components, provided the rest of the circuitry didn't skew your (resistance) measurements. You really need a basic knowledge of electronics, however.

Other than some basic "on/off" functions, a few sensor resistance measurements, and the "go/no go" stuff provided by the check engine light and a paperclip, you really need an oscilloscope or a scan tool to get to that level.

[This message has been edited by Raydar (edited 05-15-2014).]

my skills are more then the average on/off method.
but the article said something about a easy way to figure out if the ecm xas bad or not.
but i don't remeber it anymore and don't find it anymore.
i searched everything .
i wanna know this because my 1987 fiero cranks but won't start.
i checked the fuses , the relais , the ignition system, the fuel pump (and here is a problem because i don't get fuel at the fuel line that sits before the fuel filter)
someone told me it's possible that the ecm is going bad and that can cos this issue.
i already plugged in a 12V wire at the G pin of the aldl connector that sits underneath the console next to the cigarettelighter.
if i do this i just hear a click sound and nothing else.
so i thought i gonna order a new fuel pump for the tank and then someone said to me , 'wait to order that because it can be the ecm '

It is rare for an ECM to fail. Fuel pumps go bad all the time (according to the number of discussions on this forum), so it is much more likely that your ECM is good and your fuel pump is the problem. The usual way to test for a bad ECM is to get another one, because they are inexpensive....(but maybe shipping cost will be high for you).

Fuel pumps fail at a much higher rate that ECMs. At least 10 - 1. ECMs rarely fail.

Your engine won't start without fuel and you know now when you apply voltage to the fuel pump wire you are not getting fuel. That needs to be fixed first.