Ecm is not sending a signal to trigger iac

[joegreen]

actually i never checked. I will check that tonight and get back with the results.

[joegreen]

ok, so i am currently checking to see if it connects and nothing. It just says connecting. I can test the cable and it says found and functional.

[JeepsAndGuns]

Does your check engine light work? If it does, what does it do when you turn on the key? Blink twice then stay on, or blink really fast?

[joegreen]

Actually i was never able to get my check engine light to work. I know its simple to hook up but the ecm would not light up the bulb. I tried troubleshooting that for days. I ended up just plugging into the ecm periodically.

[Six_Shooter]

There's a couple red flags popping up then...

If the CEL output is indeed non functional and the IAC outouts are also non-op, then it could be a quad driver issue.

When you tried connecting the CEL, you did have 12V to the other side of the bulb, correct?

[joegreen]

Yes i did have 12 volts on the other side of the bulb and the ecm is just there to ground out the light. I tried hooking up my volt meter in between the positive and the ecm ground and would get the dvom to display the 12 volts but i could not light up the light. I made sure i had the right bulb and what not. I did a bunch of tests but could not get the cel to illuminate but the ecm was sending out a ground signal to ground the bulb so at least i think the ecm is working correctly. I bought this tbi system off of craigslist and took it off of the doner vehicle myself. The guy also had a relatively new remanufactured ecm that he gave to me.

[joegreen]

Hello, just spent the last couple days replacing the upper ball joints/ control arm and lower ball joints on a ford ranger. Anyway any ideas on what to test regarding not being able to connect to the ecm and the ecm not sendibg a signal to the iac? Thanks for everyones input so far.