service ma n ua l. F ollowin g th ese pr ocedu res is ver y
im por t a n t to t h e sa fet y of t he in dividua ls per for m -
in g t he dia gn ost ic t est s.
4.2.2 VEHICLE PREPARATION FOR
TESTING
Ma ke su re th e vehicle bein g t est ed h a s a fu lly
cha r ged ba tt er y. If it does n ot , false dia gn ost ic codes
or er r or messa ges ma y occu r.
4.2.3 SERVICING SUB-ASSEMBLIES
Som e com pon en t s of t h e power t ra in syst em a re
in t ended t o be ser viced as a n a ssem bly on ly. At -
tem pt in g t o r emove or r epa ir cer t a in syst em su b-
compon en ts m a y resu lt in person a l in ju r y a nd/or
im pr oper syst em opera t ion . Only t h ose com pon en t s
wit h a ppr oved r epa ir an d in st allat ion pr ocedur es in
th e ser vice ma n ua l sh ou ld be ser viced.
4.2.4 DRBIII! SAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THE
DRBIII! MULTIMETER IS DANGEROUS. IT
CAN EXPOSE YOU TO SERIOUS OR
POSSIBLE FATAL INJURY. CAREFULLY
READ AND UNDERSTAND THE CAUTIONS
AND SPECIFICATION LIMITS.
Follow t h e veh icle m an u fa ctu r er ’s ser vice specifi-
cat ion s a t a ll t im es.
– Do n ot u se the DRBIII" if it has b ee n d am-
aged.
– Do n ot u se t h e t est lea ds if t h e in su la t ion is
da ma ged or if met al is exposed.
– To avoid elect r ica l sh ock, do not t ou ch t he test
lea ds, t ip or t h e circu it being t est ed.
– Ch oose t h e pr oper ra n ge a nd fu n ction for t h e
mea su rem en t. Do n ot t ry volt age or cur r en t
mea su rem en ts th a t m ay exceed t h e r a t ed ca -
pa cit y.
– Do n ot exceed t h e lim it s shown in t h e t able
below:
FUNCTION INPUT LIMIT
Volts 0–500 pea k volt s AC
0–500 volt s DC
Oh m s (Resist a n ce)* 0–1.12 mega ohm s
Fr equen cy Mea su re
Fr equen cy Gen er a t ed
0–10 k H z
Tem per at u r e –58 – +1100°F
–50 – +600°C
* Oh m s can not be mea su r ed if volta ge is pr esen t.
Oh m s ca n be m ea su red only on a non -power ed
cir cu it .
– Volt age bet ween a n y ter m in a l and grou n d
mu st n ot exceed 500v DC or 500v pea k AC.
– U se ca u t ion when mea su rin g volt age a bove
25v DC or 25v AC.
– The cir cuit being test ed m u st be pr ot ect ed by a
10 am p fuse or cir cu it br eaker.
– U se th e low cu r ren t sh un t t o mea su re cir cu it s
up t o 10 amps. Use t h e high cu rr en t sh u nt t o
mea su re cir cuit s exceedin g 10 am ps.
– Wh en t estin g for t h e presen ce of volt a ge or
cur r en t, m ake su re t h e m et er is fu n ct ion in g
corr ect ly. Ta ke a r ea din g of a kn own volt a ge or
cur r en t befor e accept in g a zer o readin g.
– Wh en mea su rin g cur r ent , conn ect th e m et er in
series wit h t he loa d.
– Discon n ect t h e live t est lea d befor e discon nect -
in g t he comm on test lea d.
4.3 WARNINGS AND CAUTIONS
4.3.1 ROAD TEST WARNINGS
Som e compla in ts will requ ir e a test dr ive a s pa rt
of t h e repair ver ifica tion pr ocedur e. Th e pu r pose of
th e t est dr ive is t o tr y t o du plica t e th e dia gn ost ic
code or sym pt om condit ion .
CAUTION: Before road testing a vehicle, be
sure that all components are reassembled.
During the test drive, do not hang the DRBIII!
from the rear view mirror. Do not attempt to
read the DRBIII! while driving. Have an
assistant available to operate the DRBIII!.
4.3.2 VEHICLE DAMAGE CAUTIONS
Befor e discon n ectin g a ny con t rol m odu le, m a k e
su re t h e ign it ion is off. F a ilu re t o do so cou ld
da ma ge t he m odu le. Wh en t est in g volt a ge or cir cu it
in t egr it y a t a ny con t rol m odu le, u se t h e ter m in a l
side (n ot t he wir e en d) of th e har n ess con n ect or. Do
not pr obe th r ough t h e in su la t ion ; th is will da m age
it an d event u ally ca use it t o fail beca u se of corro-
sion .
Be car efu l wh en per form ing elect r ica l test so a s to
pr even t a cciden t a l sh ort in g of t er min a ls. Su ch a
mist a ke ca n da m age fu ses or com pon en ts. Also, a
second code cou ld be set, m a kin g dia gn osis of t h e
origin a l problem m or e difficu lt .
5.0 REQUIRED TOOLS AND
EQU I PM EN T
DRBII I" (dia gn ost ic r ea d-ou t box) sca n t ool
va cu um ga uge
ammeter
9
GEN ERAL I N FORM AT I ON
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