Symptom:
IMP R OPE R R ATIO
Wh e n Mo n i to re d a n d S e t Co n d it i o n :
IMP R OPE R R ATIO
Wh en Mon it ored: E n gin e r pm gr ea t er th a n 450 r pm , ou t pu t speed gr ea t er th a n 180 r pm ,
no N2 - N3 input speed sen sor er r or s presen t , n o gea r select or lever er ror s pr esen t, n o ABS
syst em err or s, an d a ll wh eel speeds a bove 450 r pm .
Set Con dit ion : No shift in g oper at ion a nd det ect ed g ea r is not t h e act u al gea r No sh ift in g
oper a t ion - det ect ed (ca lcu la t ed) gea r is less t h a n a ctu a l(expect ed) gea r or n o pla u sible gea r
is ca lcu la ted or Act u al t u rbin e speed - ca lcu la t ed tu r bin e speed > 300 rpm or ca lcu la t ed
tr a nsm ission ra tio is a bove t h r eshold. Du r in g a n Upshift - det ect ed (calcula ted) gea r is less
th a n a ctu a l(expect ed) gea r-1. Du r in g Down shift - det ect ed (ca lcu la t ed) gea r is less th an
act u al (expected) gea r
POSSIBLE CAUSES
TRANSMISSION ME CH ANICAL P ROBLE M
TCM - IMP ROP E R RATIO
TE S T ACTION AP PLICAB ILITY
1 NOTE: Low fluid level can be the cause of many transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
flui d lev el p er t h e s e r vi c e i n fo r m a ti o n .
NOTE: Always perform diagnostics with a fully charged battery to avoid
fa ls e s y m p t o m s .
Wit h t h e DRBIII#, r ea d t h e en gin e DTCs. Ch eck a n d r epa ir all en gin e DTCs pr ior to
per for m in g t r a n sm ission sympt om dia gnost ics.
Wit h th e DRBIII#, r ea d a n d recor d a ll Tra n sm ission DTCs.
NOTE: Ch e c k c o n n e c to rs - Cle a n /re pa i r a s n e c e s s a ry. P o o r p in to te rm in a l
connections can set DTCs.
Usin g t h e wir in g dia gr a m /schem a t ic a s a gu ide, in spect t he wir in g a n d con n ect or s.
Repa ir a s n ecessa r y.
Most DTCs set on st a r t up bu t som e m u st be set by dr iving th e veh icle su ch t h a t a ll
dia gnost ic m on itor s h a ve r u n .
Note: Verify flash level of transmission controller. Some problems are
corrected by software upgrades to the transmission controller.
NOTE: Ch e c k fo r a n y Te ch n ic a l S e rv ic e B u lle t in s th at m a y ap p ly.
Per for m t h is pr ocedu r e pr ior to Sym pt om dia gn osis.
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Con t in u e
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TRANSMISSION - NAG1
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