Bluetop Check Engine Light

[ee904age]

Does the Check pin on a bluetop ecu give 12v or switched earth?

Im having a few issues with my engine (transplant) and want to hook up a check light.

[kingcorolla]

im pretty sure it switches earth.

your doing a transplant, do you have a speed sensor hooked up? if not, your check light will constantly play up.

[ee904age]

Did transplant over a year ago, a few probs have come along.

I dont have a speed sensor but doesnt that just make the code for it show up each time? It will still show others wont it??

[kingcorolla]

i read this somewhere

If you want to run a 'check engine' warning light (which is also the means of displaying diagnostic codes) then you must run a speed sensor, which is normally part of the speedometer. If you do not run this sensor you will get an intermittent trouble warning on the check engine light, however the engine performance is not affected.

[matt dunn]

If you dont have a speed sensor the light will just come on at times when you are driving.

It will still show all the other codes.
the ecu earhts out the light.

Matt