3-4 s o le n o id - Th e 3-4 solen oid is a ct iva ted wh en
th e TCM det er min es t ha t t he t r an sm ission m u st
sh ift in t o or ou t of 4th gea r. Th e solenoid is only
act iva t ed du r in g t h e sh ift ing of t he t r an sm ission .
Wh en th e solen oid is a ct iva ted, hydr a ulic pr essu re
is a pplied t o t h e pr oper sh ift elem en ts in th e tr a n s-
mission t o a llow t h e desir ed sh ift . On ce th e sh ift is
complet ed, t he solen oid is t u rn ed off.
TCC s o l e n o i d - Th e TCC solen oid is act iva t ed
wh en th e TCM deter m in es t h a t t he Torque con-
ver t er clut ch shou ld be a ct iva ted. Th e TCC clu t ch is
a va r ia ble slip t orqu e clu tch t ha t a llows con t r ol of
tor qu e con ver t er slip fr om 5% t o 95.5% of fu ll TCC
en ga gem en t . Th e clu t ch is cont r olled by t h e TCC
solen oid wh ich is pu lse widt h m odu la t ed (P WM) t o
pr ovide th e desired a m oun t of slip.
Shift Pressure Solenoid - Th e Sh ift P r essu re
Solen oid is act iva t ed when t h e TCM det er min es
th a t a t r an sm ission sh ift is r equ ired. Th e solen oid
is P WM cont r oller t o a llow the pr oper a mou n t of
hydr a u lic pr essu re t o th e sh ift elem en t s. Th e sole-
noid is on ly a ct iva ted du rin g t he sh ift in g of t h e
tr a nsmission . Wh en t he solen oid is a ctiva t ed, h y-
dr au lic pr essu re is rem oved fr om t h e pr oper sh ift
elem ent s t o a llow t he desir ed sh ift . On ce t h e sh ift is
complet ed, t he solen oid is t u rn ed off.
Modul at ion pr essu r e sol enoid - Th e modu la t ion
pr essu re is alwa ys a ctive. Th e solen oid i s pu lse
widt h modu la t ed (P WM) contr olled a nd is u sed t o
modu la t e the hydr a ulic system pr essu re t o t he
desired pressur e.
3.2.4 TRANSMISSION COMPONENT
DESCRIPTIONS
Shift Assembly
Th e Sh ift Lever Select or tra n sm it s a ll select or lever
posit ion s, as well as select ed sh ift r a n ges t o the
TCM over the CAN Bu s. At th e sa m e t im e, t h e
select or lever posit ion s P, R, N, a n d D a r e t ra n sm it -
ted by a cable t o t h e select or lever sh aft in t he
tr a nsmission .
Bra k e s h ift in te r-lo ck
To pr even t u n au t h orized sh ift in g out of t he pa r k
posit ion , t he Select or lever is locked in t h e P a r k
posit ion u n til th e ign it ion key is tu r ned t o t h e r u n
posit ion a n d t he br a ke peda l is pr essed. This will
allow th e dr iver to sh ift ou t of the pa r k posit ion .
Reverse Lamp Output
Th e Rever se Ligh t Swit ch is in t egr a ted in t o t he
sh ift er modu le a nd con t r ols t h e r ever se ligh t s.
Reverse Inhibitor
Th e Sh ift Lever Assem bly const a n tly m on it or s ABS
wh eel speed t o pr even t s an in a dver t en t select ion of
rever se a t speeds above a ppr oxim at ely 6.4 Km /h
(4MP H ). Th e Rever se in h ibit or is pa r t of t h e Sh ift
Lever Assem bly a n d is con t rolled by t h e Sh ift Lever
Assem bly m odu le.
Tra n s t e m p s e n s o r - P /N S w itc h c i rc u it
Th e TCM will det ect t h e selector lever in pa rk a n d
neu t ra l posit ion s. Th e TCM does t his by m on it or in g
th e Tr a n sm ission t em per at u re sensor sign al a lon g
wit h t he sh ift er posit ion sign als. Th e P /N swit ch
cont a ct is oper at ed by a ca m loca ted in the t ra n s-
mission which , open s a r eed con ta ct swit ch t h at is
wir ed in ser ies wit h t h e tr a n sm ission tem per at u re
sensor. Wh en the P /N cont act swit ch is open ed in
park a nd neut ra l, the TCM senses a h igh tr an smis-
sion tem per at u re. Con fir m in g t he P /N swit ch sta -
tu s. Not e: In pa rk or neu t r al, t he TCM uses en gin e
tem per at u re (t o avoid set tin g a DTC). Th e TCM
sends a h ar dwir ed sign al t o th e E CM th a t will a llow
th e E CM cont r olled st ar t circu it t o en ga ge in P or N
only. The TCM a lso sen ds a P /N bu s m essa ge t o t h e
ECM to confir m t he P/N swit ch st at u s.
Th e N o rm a l Tr a n s m i s s i o n Te mp er a ture S e ns o r
re sistan ce is be twe en 500.0 an d 2500.0 oh ms.
Th e no r m a l v o lt a g e li m i t s fo r t h e t ra n s mi s -
sion temperature sensor, are between 0.5 and
3.0 volts .
In p ut S p eed S e ns o rs
Th e NAG1 t ra n sm ission h as t wo in pu t speed sen -
sor s N2 a n d N3, both speed sen sor s a r e loca ted on
th e va lve body a nd r epor t DTC’s for t he in pu t speed
sensor s er r ors. Th e speed sen sor s a re H all E ffect
speed sen sor s t h at a re u sed by t he TCM t o calcu la t e
th e tr a nsmission s in pu t speed. Sin ce t h e in pu t
speed could n ot be m ea su r ed dir ect ly, two of t he
drive elements ar e m easu red. Two inpu t speed
sensor s were r equ ir ed beca u se both dr ive elem ent s
ar e n ot a ctive i n all gea r s. The in pu t sen sor s N2 a n d
N3 will r eport t he sa m e in pu t speed in gea rs 2n d,
3r d or 4t h . If t he N2 a nd N3 in pu t speed sign a ls a r e
not t h e sa me in t h ese gea rs t hen t h er e is a n issu e
wit h t he t r an sm ission a n d t h e DTC In pu t Sen sor s
Mism a tch will be set .
Th e N3 in pu t speed is not report ed in 1st a n d 5t h
gea r s. Th e N 2 sen sor is n ot r epor ted in Rever se.
Th e In pu t Speed Sen sor Over speed is a ra t ion a lit y
check tha t is in t en ded t o in dica t e a ma jor t r an sm is-
sion fa ilu r e a n d will cau se a loss of dr ive (pla ce t h e
tr a nsmission in Neu t ra l)
Ou t p u t S p eed S e ns o r (AB S s i g n a l)
Th e NAG1 t r an sm ission does n ot ha ve a n out pu t
sh aft speed sen sor. Th e TCM uses t h e ABS (An -
tilock Br a ke Syst em ) Wh eel Speed sen sor in form a -
tion , it r eceives over t h e CAN bus, t o ca lcu la t e t he
tr a nsmission s ou tpu t sh a ft speed. Th e TCM mon i-
tor s t h e ABS syst em for fu n ction a lit y a n d r eport s
ABS speed sen sor a nd com m un ica t ion DTCs, wh ich
will a ffect pr oper tr a nsmission oper a t ion .
3
GEN ERAL I N FORM AT I ON
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