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Old 11-04-2004, 12:45 PM
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Analog to digital gauge cluster

I have a 1991 cehvy fullsize and want to purchase a CAMP Module from HKS electronics that converts your analog gauge cluster signal into a digital signal that you can hook up to a monitor. But in order to do that the guys at HKS said that I need an ECU diagram so that I can run the speedometer, tachometer, and fuel injection sensor wires into the unit. Does anyone know where I could get such a diagram, and are an ECU diagram and a wiring diagram the same thing? Thanks

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Old 11-04-2004, 04:57 PM
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You might try purchasing a repair manual for your particular vehicle. There should be a wiring diagram in the book. An ECM diagram is a wiring diagram of your electronic computer module. A repair manual may or may not have one of the ECM. If not try the dealership.

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Old 11-04-2004, 05:08 PM
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Thanks

I have a repair manual somewhere but I didn't even think to look in it. I'll give it a try, thanks
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Old 11-05-2004, 09:59 AM
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I haven't had much luck with ECM pinouts listed in the standard Haynes/Chiltons repair manuals. If your local library has a subscription to Alldata or Mitchels, I've found these to be great resources for pinout diagrams (called connector views in the Alldata software).

Can you share a link for the digitla cluster you're looking at? It sounds really cool.
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Old 11-05-2004, 11:11 AM
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alldata software?

is that all data a computer software or a manual? I'll look a round and see if I can find it though thanks. I put a link to the HKS website. The item is called a CAMP Module. I found the monitor that I am going to use on www.cardiscountstereos.com. This site is great for car audio/video. I just bought an Audiobahn component 6 1/2" speaker set thats awesome. Hope this helps

I thought that I put the link to the HKS website but I guessed I didn't. I'm new to the forum so I'm not familiar with everything yet. Anyway, its www.hksusa.com. Then you just go to the "meters" category on the left navigation bar, then you click on the CAMP module.
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Old 11-05-2004, 11:27 AM
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Alldata is software-based but you can print it out. Too spendy for the average guy to buy the whole package, but VERY useful. You can get a subscription for a single vehicle through their web site http://www.alldatadiy.com/

Thanks for the link, I'll check it out.

Just an afterthought. IIRC, the ECM in the '91 operates at 160 baud which translates to updates about once per second. This hardly looks like "live" data when you're viewing it, it's too jumpy. Did I read you right that you were gonna replace your stock instruments with this?

I'm not sure what your goal is, but maybe this will be an alternative for you. You could buy an old laptop (anything in the 100-200 MHz range) and a cheap ALDL cable. You can hook up, log your data and review it later - when you're not supposed to be paying attention to the road, LOL! If that's what you're looking for, let me know and I can try to help out further.
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Old 11-05-2004, 01:40 PM
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Basically, I am building a new dash and the stock gauge cluster will not fit in the sleaker smaller dash that I am building. I wanted to dress it up anyway so I found that HKS module which will convert my analog signal now to a digital signal that I can hook up to a monitor. The rep at HKS said that I need a wiring diagram to locate the speedometer, tachometer, and fuel injection sensor wires that run to my gauge cluster's wiring harness and instead run them to the module. From those, the unit can take that info and get your mpg, horsepower and some other neat little things. Not only will this look way better than my stock cluster but it will give me a lot of info too. Besides the module is only $250.00 and the monitor is a 7.2" and it's only a hundred so it's not that costly anyway. I like to know more about your laptop idea though? What does it tell you? How does it work?
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Old 11-05-2004, 02:48 PM
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akattp, your plan sounds pretty cool, can't wait to see it in action.

Hmm. How much detail do you want about the laptop/scan tool stuff? I had a way-too-long explanation typed out, but it was too long. The short version is (and this applies only to pre-96 OBD-I systems), you can buy (or build for $5) a cable that will connect your ECM to your PC. Software is available (free) to monitor the system but you can't change major program parameters on the fly. The older systems operate at 160 bits per second, newer stuff runs at 8192 bits per second - fast enough to look like "live" data if you're sitting there watching it.

Once you get the data coming in you can watch what's happening with stuff like the spark advance, oxygen sensor readings, etc. You can view error codes and you can monitor engine knock in certain RPM ranges. You can log all this data and dissect it later in slow-motion - this is step one in "tuning" a chip. The basics are in there as well - tach, speedo, coolant temp, voltage.. But no fuel level or oil pressure (on most) - the ECM doesn't need to know these things to run your engine.

That was the short version?
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Old 11-05-2004, 03:42 PM
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Wow that actually sounds a really good thing to have as far as engine tuning and things like that. My new gauge cluster will look cool and its gonna give me more useful info than the stock but not anything that I could use to help keep my engine running good, or to help me trouble shoot. When I get done fabbing up my new dash and get my monitor and stuff in I'd like to get some more info on the necessary cable and programs that I would need. I have been interested in those little tuning chip machines that hook up to your car's computer. Is this something similar to that?
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