Hello Everybody,

I have received from some of you great information with regards to the ECM pinout. I want to start to use that information. Frankly, I do not know how to. What I mean is. How do I check the voltage at different pins. I am thinking that I need a thin wire or pin that I can insert into the connector and then attach my mutli meter to the wire/pin and then ground. Am I correct? Very sorry for this. But, I just do not want to burn anything out.
I was looking at the pinout list and it says that SES control, the service engine s?, is the brown and white wire at A5. So this should have voltage of 13.9 when the engine is running.
My SES is not coming on when I start the car. IS this the wire I need to have working so that the SES works.
I only get to work on the car Friday through Sunday. So I will not be able to use this info for awhile.

thank you

 

Yes, basically just a wire you can use to check voltage with your DVM. I use a Power Probe III.

 

May the force be with you Skywalker and thank you

 

Another Power Probe user on the forum... Whoopee!!

I have a 3rd and 4th edition and I love those things. I wish more Corvette owners knew about these devices. Vader86 I am glad to hear another user knows about these great tools. The Power Probe is a very handy tool on fiberglass cars, boats, aircraft and now with the 4th edition it can be used on many new pieces. The 4th generation can test fuel injectors (Electrically) now as well.

jseremba what you are doing with your ECM should be done with the proper tools to minimize the risk of damaging the parts. I use a Fluke 87 and have a set of different tips for the leads. One of the tips is designed to clamp on a very tiny lead and the others will help you measure the voltages without shorting the pins. Some of the Fluke accessories are made to do even smaller work than the ECM. I would do this on a clean workbench with a ground strap on my wrist myself.

Good Luck jseremba on working on the ECM. I have never tried messing with one. What are you looking to find? I have heard a lot of people talk about cold solder joints and such on this forum. I hope your project works out for you!

jseremba Before you go to the ECM why don't you make sure there is a bulb in the SES socket? Believe it or not mine was missing when I bought my C4. I would also verify that the voltage is at the bulb when the car is starting. If not there are other places to start on a non functioning SES light that are a whole lot easier to get to. 99% of the time it is something simple that causes the problems. I hope your is as well!

Best regards,
Chris

 

CTMCCLOSKEY,

Thank you for your input. The bulb should be there. I purchased this one from a re builder. The original was too far gone. Plus because I am on Guam. I would have had to pay to ship it to a re builder. then pay for shipping back to me. About $80.00 just in shipping.
I looked at the Power Probes on Amazon. There are so many choices. I did not know which one I needed. I have a multi meter that goes below one volt. So buying a sexier toy is more a luxury than a need. Especially being I do not want to buy one that does stuff I do not need. I am open to suggestions.

Thank you
Joe

 

If you keep your Corvette then the Power probe 4 in a kit would be a great time saver. You can buy the other models but the 4th generation is the one I use most now.

My multi-meters that I spent several hundred dollars on are a bit much for the average homeowner but they are used very often and I love the accuracy and functions. I had a harbor freight meter that was nice but it lasted four months and was toast. Buy junk get junk.. I built large PV hybrid power systems all over the world and have been used to nice tools as well as accuracy. I have two Flukes, one is designed for automotive (Fluke 88) use and does dwell and tach functions in addition to the normal stuff and my 87 which is general purpose.

Good Luck but please check the SES bulb and socket to be sure it is capable of working before you go down the rabbit hole.

Best regards,
Chris

 

I will strongly consider your suggestions. I will most likely always be under the hood of a Corvette. So a good meter is the way to go. I will check for the bulb.

Thank you,
Joe