TCC question
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From: STL area
TCC question
This is a problem related to how I drive. Most of the time I'll use the engine for braking, not the actual brakes. What that means is that I let off the gas pedal alot. This is what it seems like, when the TPS is at 0% the TCC will unlock. It doesn't matter what the MPH is. It's a cycle that makes my converter lock and unlock maybe 100 times driving a 15 mile stretch under moderate traffic. Apply tthe accelerator and TCC locks, let off the pedal and it unlocks. Maybe I should know what's going on but I'm a bit confused....
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
There are a couple of cal parameters that pertain to 'coast release' of the TCC. These are TPS% based and can be set to 0. There is also an option bit to enable unlocking of the TCC during DFCO.
RBob.
RBob.
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Originally posted by 11sORbust
I'll check the hack. Not looking for a hand out but do you know the general location(s)? I might modify these parameters to suit my driving style....
I'll check the hack. Not looking for a hand out but do you know the general location(s)? I might modify these parameters to suit my driving style....
RBob.
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From: STL area
;--------------------------------------------------
; TCC CALIB
; 700R4
;--------------------------------------------------
L8311: FCB 6 ; UNLOCK TCC IF DIFF %TPS G.T. 2.3% IN 12,5 Msec
L8312: FCB 9 ; UNLOCK TCC IF %TPS G.T 3.5%
L8313: FCB 29 ; DIFF TPS UNLOCK TIME (12 SEC'S)
L8314: FCB 120 ; LOWER TEMP LIMIT, (50 C)
L8315: FCB 32 ; COAST RELEASE, TPS SW POINT, (32 MPH)
;
L8316: FCB 8 ; LO NPH COAST LOAD LIMIT, 3% TPS
L8317: FCB 0 ; HI NPH COAST LOAD LIMIT, 3% TPS
;
L8318: FCB 3 ; TPS HYST FOR
;
L8319: FCB 2 ; 0.2 SEC DELAY AFETER 4-3 DN SHIFT
L831A: FCB 0 ; 0 SEC DELAY BEFORE LOCK, LO GR AFTER COAST REL
L831B: FCB 0 ; 0 SEC DELAY BEFORE LOCK, HI GR AFTER COAST REL
L831C: FCB 0 ; 0 MPH LOCK DELAY BYPASS MPH THRESH
;
L831D: FCB 76 ; UNLOCK PREVENTION THRESH, (76 MPH)
L831E: FCB 0 ; OFFSET TO Vss WHEN 3RD GR REQ, (0 MPH)
; TCC CALIB
; 700R4
;--------------------------------------------------
L8311: FCB 6 ; UNLOCK TCC IF DIFF %TPS G.T. 2.3% IN 12,5 Msec
L8312: FCB 9 ; UNLOCK TCC IF %TPS G.T 3.5%
L8313: FCB 29 ; DIFF TPS UNLOCK TIME (12 SEC'S)
L8314: FCB 120 ; LOWER TEMP LIMIT, (50 C)
L8315: FCB 32 ; COAST RELEASE, TPS SW POINT, (32 MPH)
;
L8316: FCB 8 ; LO NPH COAST LOAD LIMIT, 3% TPS
L8317: FCB 0 ; HI NPH COAST LOAD LIMIT, 3% TPS
;
L8318: FCB 3 ; TPS HYST FOR
;
L8319: FCB 2 ; 0.2 SEC DELAY AFETER 4-3 DN SHIFT
L831A: FCB 0 ; 0 SEC DELAY BEFORE LOCK, LO GR AFTER COAST REL
L831B: FCB 0 ; 0 SEC DELAY BEFORE LOCK, HI GR AFTER COAST REL
L831C: FCB 0 ; 0 MPH LOCK DELAY BYPASS MPH THRESH
;
L831D: FCB 76 ; UNLOCK PREVENTION THRESH, (76 MPH)
L831E: FCB 0 ; OFFSET TO Vss WHEN 3RD GR REQ, (0 MPH)
Or maybe L831D is a better choice....
Last edited by 11sORbust; Nov 15, 2004 at 09:42 AM.
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You are running ARAP? The TCC scheme for ARAP is a nightmare, causes bucking of the car in low speed cruise. I narrowed it down to 3 parameters that needed to be changed (for me anyway).
First is TCC coast release...I set it to 40 mph, Second TCC lock up not in high gear, I set that to 40 mph, Third TCC lock up in high gear, also set it to 4o mph...The bucking disappeared,
First is TCC coast release...I set it to 40 mph, Second TCC lock up not in high gear, I set that to 40 mph, Third TCC lock up in high gear, also set it to 4o mph...The bucking disappeared,
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Originally posted by 11sORbust
I'm sorry, this is a maf(less) car running the 89 tpi ($6E) code. The locations for that would be lc290-lc291, right?
I'm sorry, this is a maf(less) car running the 89 tpi ($6E) code. The locations for that would be lc290-lc291, right?
RBob.
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From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
Might try lessing these, also.
L8312: FCB 9 ; UNLOCK TCC IF %TPS G.T 3.5%
L8313: FCB 29 ; DIFF TPS UNLOCK TIME (12 SEC'S)
I have my converter unlock on decel, and it's seamless on reapplying. Gotta tweak things til ya get what you want, on my MAP system changing the filter rates in the deccel area made all the difference on reapplication of the throttle form over run conditions.
L8312: FCB 9 ; UNLOCK TCC IF %TPS G.T 3.5%
L8313: FCB 29 ; DIFF TPS UNLOCK TIME (12 SEC'S)
I have my converter unlock on decel, and it's seamless on reapplying. Gotta tweak things til ya get what you want, on my MAP system changing the filter rates in the deccel area made all the difference on reapplication of the throttle form over run conditions.
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