SES Light. Help Please
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Le Mans Master
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From: Akron Ohio
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St. Jude Donor '09-'10-'11
SES Light. Help Please
I live about 200 miles away from where I go to school. Taking the drive this weekend, about 1/2 way the SES light came on. No other lights, car has full power, but when I shut the car off and then on it goes away. Sometimes it comes back on and sometimes not. I have done the following to my 1990 Z51: 30lb injectors, ZZ4 cam, LT4 springs, no mufflers. After all this I had a chip burned and it ran great. I removed the EGR valve and tube but it was not on the tune. Would this cause a SES light?
Thanks
Thanks
Burning Brakes
Joined: Feb 2008
Posts: 988
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From: Sarasota Fl
If you pull the codes and it is the EGR, IIRC, you can put a diode in the circuit that tricks the ECM. Check out this forum member's personal website here for more info on 'faking' the EGR system.
Last edited by janarvae; Nov 4, 2008 at 12:58 PM.
Pro
Joined: Oct 2008
Posts: 706
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From: Jyväskylä, FINLAND
Probably EGR is giving you the code (that would be 32). Check out, which code is set. This is a bit too late advise, but you should have had the EGR diagnostics turned off when you had the chip burned:
Thread Starter
Le Mans Master
Joined: Oct 2007
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From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
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St. Jude Donor '09-'10-'11
Thanks. Yeah I didnt think about the EGR until after the chip was burned. I am doing some mods this winter and will have the EGR added to the list for the re-burn.
To check codes I can put a jumper between pins A and B and turn the key to on correct? Then the SES light flashes the code? Its been a while since I diagnosed a car this way so I am tring to refresh my memory.
To check codes I can put a jumper between pins A and B and turn the key to on correct? Then the SES light flashes the code? Its been a while since I diagnosed a car this way so I am tring to refresh my memory.
Pro
Joined: Oct 2008
Posts: 706
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From: Jyväskylä, FINLAND
Yep. First it flashes code 12 three times, after this come all stored codes and after all codes have been flashed, again code 12. And then the cycle starts over.
Thread Starter
Le Mans Master
Joined: Oct 2007
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From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
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St. Jude Donor '09-'10-'11
Ok I finally got around to pulling codes and I got 32 (which stated before is the EGR) and 41. I dont know what 41 is because I dont have a manual. Does anyone know or can tell me where to look it up?
Also, I was driving around town and when the SES light comes on the car stumbles under load such as hard acceleration. Would a code 41 make this happen?
Also, I was driving around town and when the SES light comes on the car stumbles under load such as hard acceleration. Would a code 41 make this happen?
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
From Alldata:
Code 41
Cylinder Select Error
(Faulty or Incorrect Mem-Cal)
Basically it sounds to me like your custom computer chip needs to be reseated. It sounds like under hard acceleration it might be making intermittent contact.
Code 41
Cylinder Select Error
(Faulty or Incorrect Mem-Cal)
Basically it sounds to me like your custom computer chip needs to be reseated. It sounds like under hard acceleration it might be making intermittent contact.
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Thread Starter
Le Mans Master
Joined: Oct 2007
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From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
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St. Jude Donor '09-'10-'11
Thanks! I will look at it. It didnt seem all too tight when I put it in. Is there a way to make sure it stays in better if this is the issue?
Thread Starter
Le Mans Master
Joined: Oct 2007
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From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
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St. Jude Donor '09-'10-'11
It turns out it was loose. Can I put something like a paper towel in between the ECM lid and the chip to keep it from coming out again? That chip wont get hot enough it ignite the paper towel will it?
Race Director
Joined: May 2001
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Thread Starter
Le Mans Master
Joined: Oct 2007
Posts: 9,682
Likes: 3,433
From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
2024 C5 of the Year Winner - Modified
2023 C5 of the Year Finalist - Modified
2022 C5 of the Year Finalist - Modified
St. Jude Donor '09-'10-'11
Thanks! 
