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 Intermittent SES light

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nvsteve
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nvsteve

Name : Steve
Location : Minden NV
Joined : 2011-10-06
Post Count : 53
Merit : 3

Intermittent SES light Empty
PostSubject: Intermittent SES light   Intermittent SES light EmptyFri Jul 27, 2012 12:27 pm

'95 SC 101k miles, all stock......
Over the last few months I've seen my SES light come on maybe three times. It will stay on while driving but if I shut the car off, the next time I drive it the light is off. I've noticed this happened when I switched brands of gasoline. Normally I run Chevron supreme. I noticed this latest SES light was after fueling with Shell premium. The SES is off again and has been for about the last 150 miles.

Any ideas on what would cause this intermittent SES?

I bought the ALDL usb cable and have been trying to get the Tunerpro software to work but no luck so far. I'm now going to try the EFILive software.
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AA
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AA

Name : Aaron
Age : 42
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18370
Merit : 241

Intermittent SES light Empty
PostSubject: Re: Intermittent SES light   Intermittent SES light EmptyFri Jul 27, 2012 2:07 pm

Hi, Steve. The way to know for sure is to scan the car for the DTC code (it will be stored for all the times your SES illuminated). Chances are the fuel has nothing to do with it, but there might be something else going on that is affected by the fuel, or it could be coincidence.

The way the PCM "thinks" is in numbers of trips (on, drive, off cycles) vs. DTCs are detected. Some trouble codes are not as important on the hierarchy of priorities, so 1, 2, or 3 trips must be made before the SES is illuminated. Some DTCs are high priority, and so will illuminate during the 1st trip. The same system applies for turning the SES lamp off, as different codes require 1, 2, or 3 trips with no detection before the lamp will go out. All of this can seem random, especially when there is more than one DTC tripping the lamp, but the PCM is really turning the SES lamp on and off according to a set of rules programmed into its memory.

Good luck with your problem. It could be a sensor, the transmission, or pretty much anything that's not 100% mechanical. Get the scan and let us know what codes you find. Hopefully it's nothing serious.

_________________
'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO • 85k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26
Because fun


'70 Olds Ninety-Eight Holiday Coupe • 116k miles • 455 Rocket V8
Because cool


'95 Celica • 152k miles • 0-60: yes
Because free
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NelsonRiv
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Name : Zach Nelson
Joined : 2012-07-27
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Intermittent SES light Empty
PostSubject: Re: Intermittent SES light   Intermittent SES light EmptyFri Jul 27, 2012 2:24 pm

I have the same problem. Havent really noticed a pattern, but ever since Ive started filling up with premium the light has been on 99% of the time. I haven't really checked it out that much but ive noticed a lot of oil leaking around the pan. Could be that.

Keep posted
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nvsteve
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nvsteve

Name : Steve
Location : Minden NV
Joined : 2011-10-06
Post Count : 53
Merit : 3

Intermittent SES light Empty
PostSubject: Re: Intermittent SES light   Intermittent SES light EmptyFri Jul 27, 2012 3:26 pm

Aaron,

Thanks for that excellent rundown on how the PCM "thinks" and assigns the priorities to the SES lamp off and on. I honestly didn't know that. So now I know its not really "random".

If I don't get a scanning software product to work pretty soon with my ALDL cable I will have to take the car to my mechanic to read the codes.

In any event I will post whatever I find out about my SES.
Thanks again!
Steve
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AA
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AA

Name : Aaron
Age : 42
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18370
Merit : 241

Intermittent SES light Empty
PostSubject: Re: Intermittent SES light   Intermittent SES light EmptyFri Jul 27, 2012 6:43 pm

No problem Steve. I copied some of the PCM program info from my Series II tuner software. This shows the options for SES lamp illumination. It may not be exactly the same as Series I, but probably close:

Category: Diagnostics / Fault Reporting / DTC Fault Type

Min Value: 0
Max Value: 3

Parameter Description:

0 = 1 trip SES on, 3 trips SES Off.
1 = 2 trips SES On, 3 trips SES Off.
2 = SES On.
3 = No Report.

Code Data:

Intermittent SES light Screenshot2012-07-27at63649PM

Intermittent SES light Screenshot2012-07-27at63823PM

Intermittent SES light Screenshot2012-07-27at63916PM

Intermittent SES light Screenshot2012-07-27at63939PM

Intermittent SES light Screenshot2012-07-27at64603PM

Intermittent SES light Screenshot2012-07-27at64620PM

For definitions of DTCs, see this link: http://www.actron.com/code_lookup.php

_________________
'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO • 85k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26
Because fun


'70 Olds Ninety-Eight Holiday Coupe • 116k miles • 455 Rocket V8
Because cool


'95 Celica • 152k miles • 0-60: yes
Because free
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http://www.cardomain.com/ride/657082/4
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Intermittent SES light Empty
PostSubject: Re: Intermittent SES light   Intermittent SES light Empty

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