Ask a Car Mechanic and Get Answers to Your Car Questions ASAP
I will do my best to assist you. When you are finished please click on accept only if you are satisified. I don't get paid unless you do.Please do not accept if you cannot leave positive feedback. I don't know if you are a tech or a just working on your own vehicle so we may have to fine tune the answer. I only know as much about your problem as you have told me in your post, so my answers will be based on what you tell me so please add all the details you can.
Does the check engine light show in the dash when you turn the key on?
No. But come to think of it I have more of an information center, and among other things am getting a "service vehicle soon" message.
I am not an experienced car tech, so I may need you to define some terms. When you say ignition power, do you mean is the PCM being supplied with 12vdc when the key is on? If so, yes.
OK and battery power?
yes that is ignition power. THere is B+ and IGN+, both are 12V. YOu are using a meter or a test light?
I am using a meter. I don't recall an IGN+ on the schematic, but will be happy to check and get back to you. Are you looking at a print? If so, then we could save a step with you telling me connector and pin number.
YEs, one moment.
Just a minute. My computer and car are in different places. I can tell you I've got 12V at C1 19, nothing in C2 24, and the connector printout and the schematic have different opinions about what's at C1 20, but I don't think I even see a connector there. Will double check. Is it OK to check these voltages against battery negative terminal?
Against battery neg or solid ground.
Okay, don't know why I convinced myself about that pin 20. Nothing. Fuse is okay, have 12V there, so now I have a broken wire to ring out. Before I gratefully hit "accept", any other advice?
Nothing in pin 20?
That is fuse is ok?
Correct. And I have 12V at that 15A fuse. As I said, it all started when I pushed the air box out of the way to change the upper coolant hose. Vehicle has seen 250K+ miles. I may have broken a wire or the junction at the connector is damaged.
Yes, that is what I expect, broken wire.
That brittle, huh?
After that many miles, it can fatigue.
Sometimes so helpful to have someone look over your shoulder. Thanks a bunch. Can I hit accept now?
You can reply at any time for follow up information regarding this issue, even after you accept my answer and I will reply.
I've never used a service like this. Can I leave the site and come back to this conversation?
Ah. My email. One other quick question. I use Alldatadiy. Cannot manipulate the images, yet you were able to send one to me. Through this ordeal I was wishing I could piece together a "master" schematic around my problem. What program did you use?
mitchell on demand.
I'll look into it. Thanks again. I'm off to fix a wire.