Symptom:
IN VALID CON TR OL MOD U LE VER S ION
POSSIBLE CAUSES
TRANSMISSION CONTROL MODULE
IN VALID CONTROL MODU LE
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
Go To 2
2 Validat e if t h e TCM pa r t nu m ber a n d fla sh is cor r ect for th e vehicle.
Is t h e TCM pa r t nu m ber a n d fla sh cor r ect for th e veh icle?
All
Ye s → Repla ce t h e Tr a n sm ission Con t r ol Modu le per th e Ser vice In for-
ma t ion.
Per for m N AG1 TRAN SMISSION VE RIF ICATION TE ST - VER 1.
No → F la sh t h e con t r oller is applica ble. If th e con t r oller ha s t h e wr on g
pa r t nu m ber or ca n n ot be flash ed, repla ce t h e TCM per t h e
Ser vice In for m a t ion .
Per for m N AG1 TRANSMISSION VERIF ICATION TE ST - VE R 1.
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TRANSMISSION - NAG1