FirstGenRunner

First of 88 3.0....

Does the igniter measure anything other than the continuity between the igniter/coil all the way through the plugs? I'm trying to figure out what every reason the igniter would be sending an IGF signal triggering error code 14 in the ECM.

I see the A/C Amplifier, Combination Meter, and Check Connector in the circuit, but don't see anything in the documentation that says its measuring anything with these.

Thanks.

scope103

I'm not sure what you mean; so far as I know the igniter doesn't "measure" anything. Here's a description of how igniters work: http://www.autoshop101.com/ , Technical Articles, #39.

DTC (Diagnostic Trouble Code) 14 is for "IGF signal from igniter is NOT input to ECM for 6 consecutive ignitions." Are you missing a word (or two) in your question? Code 14 means the ECM is not getting the IGF signal from the igniter. Which usually means the "spark event" has not actually occurred.

The A/C Amplifier, Combination Meter and Check Connector have nothing to do with the igniter, other than eventually sharing a Ground connection.

I assume you have a DTC 14. Have you gone through the steps in the manual? http://www.ncttora.com/fsm/1990-1995...e/onvehicl.pdf

FirstGenRunner

Ok, so yes, I am receiving an error code 14. I actually have a more specific thread going on another post dealing with my issue (https://www.yotatech.com/forums/f116...e-14-a-241931/). I posted this trying to get more information specific to this igniter. If you read through there, I've tested each of the individual parts in the ignition circuit. The part about the ECM not recieving the IGF signal is backwards though. From my testing if the ECM receives the IGF signal the injectors are shut down. I proved this by pulling the the IGF wire from the plug and the car runs. As soon as it is put back into the harness, it craps back out.

So I was hoping in this thread that there is something I'm missing or haven't been able to find or don't understand about what the igniter does. I know is responsible for the initial start, and then the ECM takes over the timing when the time is right. I was just hoping there was something else I've missed. I'd like to get a full understanding.

Thanks.

scope103

I know your problem is very frustrating, but I don't really think that Toyota has several million Service Manuals out there, all of them wrong.

I don't have enough fine-grained knowledge to say exactly what a 20-year-old ECM is looking for on the IGF line, but given that your problems are humidity related, my guess would be that your IGF line is grounded by moisture. When you disconnect it, your soggy wiring gives enough of some signal to your ECM to make it happy, but when you connect the grounded IGF line it gives up. But this is really just a guess.

Good luck!

Toy3sgte

iTrader: (1)

There are mistakes in Toyota service manuals. I know there were a few in the Mr2 manuals.. like listing the wrong fuel pressure psi... etc.

Do you have a buddy to swap igniters with? Is yours bolted down and grounded?

Hadmatt54

Not sure why your engine is not shutting down without an IGF signal back to the ECU, but read this tutorial, it will give you information as to how your ignition system is designed to work.
http://www.autoshop101.com/forms/h23.pdf