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 Wit h t h e DRBIII#, r ea d th e a ct ive a n d st or ed DTCs for a ll modu les th a t u se CAN Bu s
comm u n ica t ion.
NOTE: Due to capabilities of certain controllers that use the CAN Bus, not
all modules report CAN Bus DTCs.
NOTE: If a total CAN Bus failure transpires, there will be multiple CAN Bus
DTCs present in many modules. If the other modules are reporting Trans-
mission CAN Bus messages ONLY, answer No for the following question.
Are ot h er modu les r epor t in g a ct ive or st or ed CAN Bu s com m u n ica t ion DTCs?
All
Ye s → Go To 3
No → Go To 12
3 Tur n th e ign it ion off t o t h e lock posit ion .
Discon n ect t he n ega t ive ba tt er y cable.
Wh ile ba ck probin g, m ea su re th e r esist a n ce bet ween t h e CAN C Bu s (+) an d th e CAN
C Bu s (-) in th e select ed con t r ol m odule ha r n ess con n ect or.
NOTE: Termination of the CAN Bus is located in the ECM and SKREEM.
Both modules use a 120.0 ohm resistor for termination of the CAN Bus. A
properly terminated CAN Bus will read 60.0 ohms ± 5.0 ohms.
Pick t h e one t h a t best descr ibes you r rea din gs:
All
60.0 oh m s ± 5.0 oh m s.
Go To 4
120.0 oh ms ± 5.0 ohm s.
Go To 10
Less t h a n 60.0 ohm s
Go To 8
49
TRANSMISSION - NAG1
CAN B U S CIR CU IT — Co n t i n u ed
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