Symptom:
SYS TEM U ND ERVOLTAGE
Wh e n Mo n i to re d a n d S e t Co n d it i o n :
SYS TEM U ND ERVOLTAGE
Wh en Mon it or ed: Alwa ys m on it or ed wit h syst em a ct ive a t ea ch ign ition cycle.
Set Con dit ion : Ign it ion volt a ge fa lls below 8.5 volt s wit h t h e en gin e rpm gr ea t er t h an
2000 r pm for 60 secon ds.
POSSIBLE CAUSES
ENGINE CH ARGING SYSTE M DTC’S P RESE NT
TRANSMISSION RE LAY OUTP UT LO AT TCM
TCM - SYSTE M UNDER VOLTAGE
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 th e DRBIII#,readEngineDTC’s.
Are t h ere a n y E n gin e Ch a r gin g Syst em DTC’s pr esen t ?
All
Ye s → Refer t o t h e Ch a r gin g ca t egor y an d perfor m t h e appr opr ia t e
sym pt om .
Per for m N AG1 TRAN SMISSION VE RIF ICATION TE ST - VER 1.
No → Go To 3
109
TRANSMISSION - NAG1
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