Symptom:
TR AN S MIS S ION S LIPPIN G
Wh e n Mo n i to re d a n d S e t Co n d it i o n :
TR AN S MIS S ION S LIPP IN G
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 er r ors, no tr a nsfer ca se er ror s pr esen t , a nd a ll wh eel speeds bet ween 70 - 380 r pm
wit h n o wh eel slip det ect ed. Set Con dit ion : Ca lcu la ted r at io n ot wit h in a llowa ble ra n ge for
th e en ga ged gea r. No sh ift in g oper at ion .
Set Con dit ion : Th e TCM con sta n tly calcu la tes t h e t r an sm ission r a t io ba sed on t he N2 -
N3 in pu t speed sign a ls a n d t h e ca lcu la t ed out pu t sh aft speed (CAN m essa ge fr om t h e
ABS). Th e TCM will det ect if t h e t r an sm ission is slippin g or a n in va lid gea r r a tio is pr esen t
POSSIBLE CAUSES
OTH E R DTCS P RE S E NT
AXLE - ME CH ANICAL - GE AR RATIO
IN TE RN AL TRANSMISSION
TCM - TRANSMISSION SLIP PING
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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