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Old 07-04-2013, 09:42 PM   #1
maddios
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Join Date: Oct 2005
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functional check TEV

Hey guys, been battling my car for the past 2 weeks, trying to pass emissions.

It kept throwing the mixture too rich error and lighting up the MIL.

Took intake off, replaced all seals and vacuum lines, replaced valve cover gaskets and spark plugs. there's a definite improvement but it's still not close enough.

I'm using INPA to diagnose and I'm seeing this annoying error, "250 functional check TEV". what does this error actually mean? I ran the DMTL check and it came back successful, the evap valve itself works fine (i tested it on the bench and with inpa). what else could this error mean?

Thanks
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Old 07-04-2013, 09:50 PM   #2
maddios
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oh, forgot to mention that the car also complains about O2 sensor heater on bank 2 downstream, randomly (rarely). Could this be related to the TEV check since I know that the car looks for the mix to get rich during its TEV checking.

I have a new pair of downstream O2 sensors coming early next week so at least I can see if that fixes it, already replaced the 2 upstream ones yesterday.
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Old 07-04-2013, 10:18 PM   #3
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What are your LTFT (long term fuel trims)?
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GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
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Old 07-05-2013, 01:17 AM   #4
maddios
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which trims are those? are you referring to the additive and multiplicative trims in the inpa lambda adaptation screen?

if you're referring to those, they're:
additive is like around .14-.18
multiplicatives are both around 1-2 (maybe sometimes around 2.5)

Bank 2 is slightly higher than Bank 1, within that range.


Problem is that every time the TEV thing flips the numbers reset so I haven't been able to see how it goes for a while.
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Old 07-05-2013, 06:56 PM   #5
maddios
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more info, these are the 2 errors that keep getting reported in the DME.

As for the adaptation values, I finally got it to run for a while without tripping, additives are .11 and .14, multiplicatives are 4.25 and 4.06 (these are Bank 1 and Bank 2)




E R R O R M E M O R Y R E P O R T
-------------------------------------Date: 07/05/13 19:52:52
ECU: MS430DS0
JobStatus: OKAY
Variant: MS430DS0
-------------------------------------------------------------RESULT: 2 errors in error memory !
-------------------------------------------------------------191 Lambda probe heating downstrem sensor 2
Error frequency : 1
Logistic counter: 40
N_32 1760.00 rpm
MAF 354.06 mg/stk
V_LS_DOWN_2 0.81 V
R_MV_LS_DIAG_DOWN_2 4369.00 Ohm
aufgetreten vor (rel. BZ) 0.50 h
---------Cat-sensor heater defective
Error to relevant
Error debounce
Error currently available
stat. Error
Errorcode: BF 78 01 28 37 41 A1 11 92 2E
-------------------------------------------------------------250 functional Check TEV
Error frequency : 1
Logistic counter: 40
N_32 704.00 rpm
MAF 163.41 mg/stk
TCO 92.25 Grad C
CPPWM 83.20 %
aufgetreten vor (rel. BZ) 0.00 h
---------functional Check TEV n.i.O.
Error to relevant
Error debounce
Error currently available
stat. Error
Errorcode: FA 78 01 28 16 1E BB D5 92 33
============================================================ =
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Old 07-07-2013, 12:20 AM   #6
maddios
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bump
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Old 07-07-2013, 09:05 PM   #7
maddios
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did i post this in the wrong subforum? or does no one really have an answer?
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Old 07-08-2013, 02:32 PM   #8
maddios
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here's an interesting question, maybe more specific, anyone know what CPPWM 83.20 % means?

looks like a PWM of sorts, but what's CP?

Last edited by maddios; 07-08-2013 at 02:32 PM.
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