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  #1  
Old August 1st, 2006, 10:45 AM
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Check Engine Light

Hello all.

My check engine light was on so went to the mechanic to reset. The next day it was back on.

Went to the mechanic today and got a code that said could not communicate with ECU make sure ingnition is on and connecting to ECU.

Why would it reset before and now cant communicate?

Checked the connections and they are fine.

Its the end of the month and I need an inspection sticker to drive or the police will give me a ticket.

Anybody got any ideas.
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  #2  
Old August 1st, 2006, 01:13 PM
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Was he trying with the engine running?? or just with the key on??

If not do you have an afetrmarket stereo??

Don't worry... this is going somewhere.
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  #3  
Old August 1st, 2006, 02:36 PM
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Barry O'Mahony
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Quote:
Originally Posted by ron
Anybody got any ideas.
yea, what code did he get before he reset it? A code is an indication that something unusual is detected.
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  #4  
Old August 2nd, 2006, 10:11 AM
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He tried with the key on then started with the same effect. Yes I added a stereo and grounded the wire to the amp.
The prev codes where O2 sensor, rough ride and something about purge valve.
The rough ride code came up cause the PO cut the wires to the sensors and I respliced connectios.

When the code came back on I found that an O2 sensor was hand loose.
i tighten that and a few bolts on the manifold.

I havent done anything else to the truck since the last reset except the stereo

Could the interface connection for the machine be in backward?
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  #5  
Old August 2nd, 2006, 10:19 AM
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You can't ground the wire at the amp. The signals flow through it. If you removed the amp you have to connect the incoming and out going ground wires together and the ECU should communciate correctly.
Its part of the wiring for the Uk style security system that NAS 90s don't have, but the wires have to be connected for the ECU to use the diagnostic port.

If you want to get real tricky if you run the engine, then shut it off and turn the key to the "accessory" position you'll have a 15 second window tro view and clear codes. Sucks to do it that way though, just fix the amp wiring and you'll be set.

We see that all the time.
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  #6  
Old August 2nd, 2006, 04:14 PM
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I think that I did. Its the solid black wire correct.


Short term Im going to get a reject sticker.

I dont need the police trailing me cause i'm missing a sticker.

Not to mention the fact that I have had the truck since March and i was supposed to get a sticker 7 days after purchase

I may try your trick later,its a pain driving an hour to the mechanic to have it reset each time.

I miss my distributer.
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  #7  
Old August 2nd, 2006, 04:16 PM
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A $40 OBD II scanner from Wal-mart will reset the codes.
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  #8  
Old August 2nd, 2006, 04:26 PM
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really....
Is the port a standard port ?
No special soft ware needed?
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  #9  
Old August 2nd, 2006, 07:38 PM
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Quote:
Originally Posted by ron
really....
Is the port a standard port ?
No special soft ware needed?
Yep. Every car sold in the U.S. since 1996 MY.

Considering this, I bought my own scanner, too. Mine keeps throwing a "rough road" code, and I haven't bothered to find out which speed sensor it is yet.
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  #10  
Old August 3rd, 2006, 09:43 AM
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I think I'll be buying one at lunch time and see if I can reset mine.
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  #11  
Old August 3rd, 2006, 10:25 AM
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Yes and No on the scanner.
If the ECU will communicate an OBDII scanner will work, but you have to fix the ECU wiring first otherwise a cheap scanner or a costly Rovacom can't do it (unless you use that 15 second window).
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  #12  
Old August 3rd, 2006, 10:38 AM
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Im going to try the 15 second window and see what codes blow.
Then fix whats wroung .
Maybe Ill get lucky and there wont be any codes... yeah right
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  #13  
Old August 3rd, 2006, 10:46 AM
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If the light is on... you have codes.
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  #14  
Old August 3rd, 2006, 02:04 PM
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there you go Mike popping my ballon of hope. : )
I bought the OB II tool today ill let you know how it works out.
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  #15  
Old August 3rd, 2006, 02:11 PM
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My scanner also displays pending codes. So, if it's a code set after several fault cycles you will be alerted. If it's an instant code then clear it just before you go in for smog and hope it doesn't reappear when the shop restarts the truck.

Of course, if the code leads you to a simple repair, you should take care of it first.
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  #16  
Old August 3rd, 2006, 02:50 PM
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Our '97 had the pesky "rough road" code when we got it too.

Turns out that there were two causes ... (1) the dealer tech had removed & replaced the computer - since the code was exhibited previously - and forgot a ground wire, and (2) there was a software update available that hadn't been installed yet.

As much as I hate to say it ... ssshhh, the light hasn't been on for the past couple of years ...
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  #17  
Old August 7th, 2006, 10:18 AM
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Thursday night I bought a OB II tool and cleared all the codes. drove the truck about 30 miles without issue.
Took off work friday to go get my sticker and paint and install my slick rock sliders. The sliders have had some good use but are rock solid.
I woke up 7:00 to go get my sticker and it was raining. I turned on my wipers and the werent working . (blown fuse). So I drove to the parts store to get a 20 amp fuse and when i started the truck the light was back on. But my wipers now work.
I decided it was better to get a rejection sticker than play around with it . so went to the inspection station. there where 2 people ahead of me so i hooked my OBII tool and the code cleared.
drove in and shut the truck down and when i started it agin the light was on.

The guy hooked it up to the machine and it couldnt communicate.
Could it be the pig tail has an issue?
I know I have other problem as 4 codes came up

443
1193
1317
3999
I know that 443 is the purge valve circuit malfuntion but dont know the others.
anybody got the definitions on the codes?
Thanks
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  #18  
Old August 7th, 2006, 10:29 AM
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"and it was raining."

Check to make sure water did not get in the computer.

When GEMS are acting weird it has a high chance of a wet computer. Dry it out well and protect it and it should be ok, unless it has already started to corrode (wet once = probably be wet before).

BTW do you always get the CEL on start up for a few seconds? You should, if you do not then you have a serious issue.

google will yield the codes meanings, they are out there.

It seems like it is either a bad computer (last resort as they are spendy) or a bad ground/some sort of wiring issue.
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  #19  
Old August 7th, 2006, 10:38 AM
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Arthur Maravelis
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Here's the code list I carry with me.
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File Type: pdf OBD2_codes.pdf (4.7 KB, 428 views)
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  #20  
Old August 7th, 2006, 02:09 PM
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Thanks Art
443 = Evap purge valve open
1193= O 2 sensor heater circuit open down stream
1317= abs rough ride line low fault
3999= ?? cant find this one did a google search nothing cae up of importance.
could I have a bad ground causing these codes or is it something deeper

Ron

the light comes on all the time. when it was reset it came on for a second then off.
Ill check the computer to make sure its not wet.
the cover is off right now.

The truck runs and drive great no drivabilty issue. Just drove 250 miles over the weekend and did some light off roading on Nauset Beach.
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