The srevice ASR light keeps coming on reguardless if the ASR is in or off. Also the security light occasionally blinks on and off. While this is blinking the Mpg average blinks 5y5 what ever that means.
Can anybody help explain whats wrong???? Thanks

 

Ziggy, I'm going to to tell you something of which you are aware: "SERVICE ASR" indicates a condition present in the ASR system which requires service. My manual doesn't list any trouble codes related to ASR. Your ASR system functionally intergrates the spark retard, throttle close down, and rear brake intervention. You may need professional help, unless a forum member has experienced this problem, and can help you.

 

The 5y5 actually is SYS, for system. I can't remember right off hand exactly what it means. Let me look for it. If I find something I will re post.

 

My ASR service come on as well. I have been driven with light on for 2 summer. I did not bother to get it fix. So I don't really know what is causing it. Oh well.

Bruce
93LT1 Conv w/ZF6
Blown D1-SC/N2O
ARE built 383ci/Stage II heads

 

The CCM uses the speedometer to display codes, the odometer to display data, and the trip monitor to to indicate the 'module' being tested.

From the shop manual: "When a current CCM, ECM, or ABS/ASR fault code is present, the letters "SYS" (System Error) will flash in the trip monitor display three times every fifteen seconds.

The CCM is module 1, the ECM is module 4, and the ABS/ASR is module 9.

The ASR diagnostic codes can be displayed on the speedometer LCD by jumpering the correct terminals on the diagnostic link by the driver's right shin, under the control panel.

The ALDL terminals are labeled like this, as you look at them:

F E D C B A <-top row
G H J K L M <-bottom row

Get a short length of stiff wire and bend it so that you can get one end in hole A and one end in hole G (top right hole to bottom left hole).

Put the key in the ignition and turn it to the RUN position but don't start the car. The fans will roar to life for a few seconds, scaring you to death if you're not ready for it. The LCD section of the cluster will go blank. Then any stored fault codes will be displayed. After the display runs through stored codes (have pen and paper ready!) the LCD will display "1.0", CCM module, ready for further tests.

Use the TRIP RESET button once to display "4.0", and once more to display "9.0". Module 9 is ABS/ASR. All ABS/AST codes are stored as "historical" codes. FUEL RESET is backspace, sends you back down the list.

You're looking for a "9.0" or "9.1" to be displayed where you normally see temps, range, etc., followed by a code where you normally see speed. Three dashes mean no codes or end of codes "---"

It's not as complicated as I managed to write it. Jumper A to G, turn the car to "RUN", watch for what codes you get for module 9, and come back here and tell us what you learned.

 

My 92 has done this for about a year. I changed the battery, had the alt. checked and it still does the "SYS" thing. I just learned to live with it. But after reading how to pull the codes, I went out and got the following:
1. H 13
H 72
H 74

4 - - -

9 H 72


1.0


Then a C 12 came up...

OK, what's it all mean...how do I reset the codes...

Thanks
Roger :confused:

 

TTT :seeya

 

Module 1, CCM, three stored codes

1. H 13 - (historical) Driver information switches, open or shorted to B positive.

This may be an intermittent, but it means you have a bad or broken switch on the DIC. One of your buttons is sticking, or dirty, or failing. This could make it hard to run the rest of the tests...

1. H 72 - (historical) LCD dimming output circuit open or shorted to ground

Possibly a poor connection to the CCM, the radio control head, or the HVAC control head. Has anyone been working in the guts of your console, perhaps installing an aftermarket audio system?

1. H 74 - (historical) LED dimming output circuit open or shorted to ground

Possibly a poor connection at the CCM, the light switch, the radio control head and the HVAC control head. Same as above.

4. --- No stored codes for module 4, ECM

Module 9, ABS/ASR, one stored code.

9. H 72 Serial data link fault. "This will set and the SERVICE ASR indicator will illuminate if the EBTCM detects three consecutive serial data link messages that are ignored due to errors in transmission."

To reset the codes, jumper the ALDL as posted, and turn the key to RUN. You are in diagnostic mode. Use the TRIP RESET button to move through each module menu, stopping at 9.0. Then press TRIP ODO twice to change to 9.7. Finally, hold the ENG/MET button until "---" appears in the display. Turn the key to OFF and remove the jumper. Now go for a test drive to see if the code returns and the SERVICE ASR indicator comes back. Be sure to do something that will trigger the ABS/ASR system...

This will clear your code 72.

I confess I am unsure of the meaning of this code 72. My service manual gives this hint - if code 72 is set but code 41 is not, there is most likely an open circuit between the CCM and the EBCTM (brake controller module). There is the chance that the serial connector in the bottom rear of the ABS compartment next to the EBCTM and under the valve assemby has a loose wire.

Putting this all together might indicate a failing CCM wiring harness...or just a few loose connectors.




[Modified by The Paladin, 9:22 PM 9/29/2002]

 

Top.

BTW, I claim no expertise, but I do have both the service manual and Gordon Killebrew's guidebook to code troubleshooting. That is where this came from. I cannot recommend these highly enough.

 

Thank you sir, That's just the info I was looking for... :yesnod:

 

First off let me tell you that I am not a fan of the replace this and that philosophy, but had these same codes/SYS/Service ASR and spent 12 days in the shop for diagnosis. Don’t ask what that cost! Finally ran into an old friend who, as it turns out is a Corvette mechanic for another local GM dealership. He said replace the ECM.

Well the end of the story is this: $99 and 16 months later and no more codes.

 

Ziggy !
My 93 Coupe's Service ASR light came on just like yours and then the Security light would flash, but on my digital read out screen, it would also flash "System". Couldn't figure it out, so I took it in to a repair shop, after 2 days they had downloaded over 214 codes, then they let me take her for the weekend to see what codes would be entered. Well, there were only three that kept coming back . They checked into them and thought that they had it all fixed, when coming back after driving it for an hour they drove over a bump and it set all sorts of codes ! They took her into the shop again , with the engine running they tapped the computer and everything stopped. Engine died etc. So they replaced the ECM unit. It costs me $250 for a ECM and $240 for the shop to diagnose the problem. The car now runs great !!! You might take a look at your computer....

Good luck :bs :cheers: :D

 

Thanks Bob for the advise. and everyone else that helped. I'll let you all know what develops

 

my service ASR light comes on every once in awhile and then goes off after a couple start cycles. It does this once maybe every 5000 miles