This is for a 1999 Auto.

The instrument panel displays "service engine soon", there are no codes according to the OBDII scan, so how do you reset this message? I've heard that you can pull the "ecm" fuse for about 5 minutes and that'll do the trick but which fuse is that? The fuse panel at the passenger footwell has no "ecm" fuse, but it does have a bunch of fuses for the various computers. Is there another fuse panel somewhere else?

OR, I also read you can disconnect the battery for about 5 minutes as well, this will reset the message. However, are there any issues with doing this, like will I have to reprogram anything? (besides the radio presets)

thanks for any tips on resetting this message.

 

No Codes? Might want to check that again.
Push and hold option button while hitting the fuel button four times. I'm guessing something will show up.

 

I think you are right. My AutoTap aways tells me there are no codes, when there are some in the DIC

 

OK, I tried holding down the options button and pushing the fuel button 4x, did this both with the engine running, and the ign key in "on", but engine not running. Both times, the display read 'brake before shift", then switched to "service engine soon" and then alternated between the "brake" and "service" messages. I tried it several times, if I hit the brake and shifted, that message disappeared, and "service engine soon" came back on and stayed.

I have a friend with a mechanics shop that did the OBDII scan, he has a snap-on scanner, it said no codes were stored, and the friend said he doesn't have the info on how to reset the service message, say's it's a different computer??

BTW, the car runs fabulously.

???

 

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1) Turn on the ignition but don't start the engine.
2) Press the "reset" button to turn off any warning messages
3) Press and hold "options" and
4) While holding "options", press "fuel" four times within a 10-Second period.

Initially, the on-board diagnostics go into the "automatic" mode, which shows each module's DTCs in a
pre-set sequence: (Page No. are for the GM Service Manual)
10 PCNI Powertrain Control Module page 6-357 - 6-361
28 TCS Traction Control system ABS on page 5-86
?? RTD Real Time damping page 3-136
40 BCM Body Control Module page 8-405 LTD Page 8-727
60 [PC instrument Pane! Cluster page 8-508
80 radio page 8-213
99 FIVAC Heater Vent-Air Conditioning page 1-118
A0 LDCM Left Door Control module page 8-904 to 8-951
Al RDCM Right Door Control Module page 8-904 to 8-951
AC SCM Seat Control module page 8-1064-8-1082
B0 RFA Remote Function Actuation page 8-676

For each module, all DTCs will be displayed. If none are present in a module, you will see "no more codes" on the ICP display.
There are two kinds of DTCs, "Current" and "History," designated with a letter suffix, "C" or "H". A current code indicates that the malfunction is present in the system whose module is displaying data. A history code indicates a problem existed in that module sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it is possible it's evidence of a previous problem. Now solved, that was not removed by clearing codes. More likely is that a history code indicates an intermittent malfunction.

"Intermittent" are the most challenging DTCs. An intermittent may have happened only once, may have happened more than once but is inconsistent in its appearance or may be happening on a regular basis but not at the time the IPC is displaying codes. History codes can also be caused by a current malfunction in a system that is not Operating at the time DTCs are displayed. An example is the rear window defogger, which doesn't operate until the BCM detects engine rpm. For history codes set by a system that does not operate with the key on and engine off, a special diagnostic tool called a "scan tester is necessary to properly diagnose the malfunction.

Once the IPC has displayed all 11 modules, the system goes into the manual mode, which allows selection of each module, using combinations of DIC buttons. The manual mode can also be entered at any time during the automatic sequence by pressing any button except "E/M". Once the IPC displays "manual diagnostics", you may select a particular module by pressing the options button to go forward or the "trip" button to go back. Once a system is selected and a DTC is displayed, if more than one are present; press "gages" To move forward or "fuel" to go back. To exit the diagnostic mode at any time, press E/M". If you want to erase or "clear" codes, press "reset". Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory.

 

So much for the Snap-on scanner! :-)

It had a bunch of history codes, I cleared them all, but there's one current code in the 28-TCS module, it's code C1228 C

Anyone know what that is?

Also, is there a list of the various codes? I wrote them all down (the history codes) before I cleared them.

Is it possible to clear the current code? When I push reset while that code is displayed, there's a beep, then it just shows the code again, it won't erase it. I thought I'd clear all the codes, then drive it and see what it did.

thanks for all your help.

 

C1228 is RR Excessive wheel speed variation

 

OK, what would cause that? All the tires are the same size, they are new.

Is it possible to clear this code somehow, then drive the car to see if it resets?

And, is there a list of all the codes somewhere?

thanks

 

Rear axle clutch pak going south? This would cause one wheel to spin more than the other. Unless maybe you drove in tight circles round and round for about 5 minutes (which I doubt)

 

Would this? It seems to me that if the diff is forcing one wheel to spin faster than the other, you'd feel that in the handling. The car handles perfectly. I wonder if maybe one of the wheel sensors may be off? Do they get dirty?

 

I get the "Service Vehicle Soon" message every day when sitting at a stop light.

Pressing the "Reset" button on the DIC gets rid of the message. The message will not return asl long as the car is still running. Once the car is shut off, and the error condition happens again, the message will re-appear at which point you simply hit the reset button again.

"Reset" works for a lot of things - including low fuel warnings.

greg

 

.....I am telling ya, hit the "Reset" button. You have to Reset anyway before looking at the codes in the DIC - at least that's what the documentation says to do.

 

I recently purchased a 97 6sp. Does my display work the same way or does it depend on the year. When I bought the car it came with no manuals or anything.