Symptom:
IMP R OPE R GE AR
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 GE AR
Wh en Mon it ored: E ngin e RP M gr ea t er t h a n 450 a nd ou t put speed (ABS) gr ea ter t h a n
180 RP M. No In put Speed sen sor N2 - N3, Shift lever, a n d/or ABS wh eel speed DTCs
present.
Set Con dit ion : The TCM com pa r es th e ca lcu la ted gea r wit h t h e gea r th e tr a nsm ission
ha s act u ally en ga ged. If th e act u al gea r differ s from th e gea r ca lcu la ted by th e TCM, t h e
TCM va lu e is a dju st ed to th e en ga ged gea r an d a cou n t er is incr ea sed by 2. If a ft er a sh ift
th e en gaged gear a nd t h e ca lcu la t ed gea r st ill ma tch , t h e cou n t er is decr ea sed by 1 poin t.
A DTC is det ect ed a s soon as t h e cou nt er exceeds a t h r esh old. If t h e fa ult is det ect ed 3
consecu tive ign it ion cycles t he t ra n sm ission will be pla ced in Lim p-in a n d th e MIL
act iva ted.
POSSIBLE CAUSES
ABS DTCS P RE SE NT
SOLENOID DTCS PRESENT
IN TE RN AL TRANSMISSION
TCM - IMP ROP E R GE AR
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.
All
Con t in u e
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74
TRANSMISSION - NAG1
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