What can cause a flashing SES light?
What can cause a flashing SES light? I've looked and searched for days about this. It's on a 2000 SS A4. Torque converter doesn't lock and then the light starts flashing. It does not give a code.
We have replaced the Trans, converter, PCM, Guage cluster.... The car did it before the Heads, cam intake, 12 bolt.... and it still does it! Please help. I konw a bad misfire can make the SES light flash. But it runs as smooth as any other 224/228 114 lsa cam I've seen. The car has been tuned for drivability and the tuner had no Idea why it's doing it.
Another question; what is TCC PWM? I'm sure it has to do with lock up, but how it work?
Please help guys. Mine is a six speed so I'm new to this PCM controlled auto.
We have replaced the Trans, converter, PCM, Guage cluster.... The car did it before the Heads, cam intake, 12 bolt.... and it still does it! Please help. I konw a bad misfire can make the SES light flash. But it runs as smooth as any other 224/228 114 lsa cam I've seen. The car has been tuned for drivability and the tuner had no Idea why it's doing it.
Another question; what is TCC PWM? I'm sure it has to do with lock up, but how it work?
Please help guys. Mine is a six speed so I'm new to this PCM controlled auto.
FormerVendor
Joined: May 2006
Posts: 187
Likes: 0
If your tuner is near, he should be able to see something in the scanner when the SES flashes. It is definitely misfire related.
Auto's are a different world.
Be prepared for much reading. Definitely check out HPT's Transmission forum.
Auto's are a different world.
Be prepared for much reading. Definitely check out HPT's Transmission forum. When I had that we set all misfire tables to 36272 or something like that and set Map Min value to 0 and Map Max value at 100 no more light. By the way mine showed misfire though it was idling and running fine as well just you need to tell the car that it is running fine. My code was P0300 which is general misfire now if you have a P030x the x being 1-8 that tells you what cylinder is misfiring but if it is 0 that is random.
[QUOTE=John-SDPC]If your tuner is near, he should be able to see something in the scanner when the SES flashes. It is definitely misfire related.
QUOTE]
It was flashing while our tuner was in the car tunning it. And he could not find any codes.
Is there any other condition, other than misfires, that the SES light would flash and give no code.
QUOTE]
It was flashing while our tuner was in the car tunning it. And he could not find any codes.
Is there any other condition, other than misfires, that the SES light would flash and give no code.
FormerVendor
Joined: May 2006
Posts: 187
Likes: 0
[QUOTE=thunderdan74] Need to know under 'what' conditions this occurs: Idle, light load, WOT. What does does spark, KR, etc. look like when it occurs? There are also many misfire parameters that he can include in the scan.
Perhaps you could post your tune or a log?
Originally Posted by John-SDPC
If your tuner is near, he should be able to see something in the scanner when the SES flashes. It is definitely misfire related.
QUOTE]
It was flashing while our tuner was in the car tunning it. And he could not find any codes.
Is there any other condition, other than misfires, that the SES light would flash and give no code.
QUOTE]
It was flashing while our tuner was in the car tunning it. And he could not find any codes.
Is there any other condition, other than misfires, that the SES light would flash and give no code.
Perhaps you could post your tune or a log?
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Originally Posted by thunderdan74
I've looked and searched for days about this. It's on a 2000 SS A4. Torque converter doesn't lock and then the light starts flashing. It does not give a code.
Its possible something else could cause it. The blinking is to warn you of a "potential catalyst damaging problem". OBD2 diagnostics 101.
Seems basic diagnostic principals get lost in all the internet tech savvy mumbo jumbo. (not aimed at you)
Originally Posted by thunderdan74
Another question; what is TCC PWM? I'm sure it has to do with lock up, but how it work?
How does it work? In simple terms, it pulses rapidly to "smooth" the application of fluid pressure to the TCC. The control solenoid on the other hand, is on or off.
Originally Posted by thunderdan74
Please help guys.
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I've had it casued by a lose plug wire, but it sounds like you have a random misfire issue. Normal for stalls w/cams. You need to set ALL of your cells to 32767 (in the Eng Diag table).
+1, I was working on a cammed stalled car this afternoon, and got no codes while the light flashed. Looking at the scanner, it was obviously fine. Same symptoms, flashing light and the verter won't lock properly (even when not flashing). I did what is stated in the post above and all is well.
Thanks for all the Info guys. You're a big help. I don't know what software he using to to the tune. I'll find out. The car aparantly was doing this when it was stock.
It flashes only when I'm cruising above 45 MPH and/or duing light acceleration. Seems like the PCM is just trying to tell me "Hey! The converter is not locked and it is supposed to be locked right now!"
I have a Predator and I have been using it to monitor the PCM while driving. When the SES starts to flash I reset the DTC and the Converter will lock up for a few seconds if I keep the speed constant. It will stay locked for much longer if I vary the pedal lightly. But when I lock it up it does it hard. I"ve seen the schematics for the PCM. That's where I found out about the other PWM Solinoid. I figured TCC PWM was the function used to smoothly lock the coverter. I wonder if I have an issue with that circuit.
I've contacted the tuner about it and I plan on asking him about the misfire count Cells he set for.
It flashes only when I'm cruising above 45 MPH and/or duing light acceleration. Seems like the PCM is just trying to tell me "Hey! The converter is not locked and it is supposed to be locked right now!"
I have a Predator and I have been using it to monitor the PCM while driving. When the SES starts to flash I reset the DTC and the Converter will lock up for a few seconds if I keep the speed constant. It will stay locked for much longer if I vary the pedal lightly. But when I lock it up it does it hard. I"ve seen the schematics for the PCM. That's where I found out about the other PWM Solinoid. I figured TCC PWM was the function used to smoothly lock the coverter. I wonder if I have an issue with that circuit.
I've contacted the tuner about it and I plan on asking him about the misfire count Cells he set for.
Originally Posted by Frost
+1, I was working on a cammed stalled car this afternoon, and got no codes while the light flashed. Looking at the scanner, it was obviously fine. Same symptoms, flashing light and the verter won't lock properly (even when not flashing). I did what is stated in the post above and all is well.
