Jeep Cherokee 1999 Electronic Service Manual page 1401

21 - 78 TRANSMISSION AND TRANSFER CASE
DI AGN OSI S AN D T EST I N G (Cont inue d)
Fig. 4 Ignition Key Cylinder Actuation
n eeded t o m a in t a in n or m a l speeds wit h a pr oper ly
t u n ed en gin e.
(6) P er for m h ydr a u lic pr essu r e t est if sh ift pr ob-
lem s wer e n ot ed du r in g r oa d t est .
(7) P er for m a ir-pr essu r e t est t o ch eck clu t ch -ba n d
oper a t ion .
VEHICLE IS DISABLED
(1) Ch eck flu id level a n d con dit ion .
(2) Ch eck for br oken or discon n ect ed gea r sh ift or
t h r ot t le lin ka ge.
(3) Ch eck for cr a cked, lea kin g cooler lin es, or loose
or m issin g pr essu r e-por t plu gs.
Fig. 3 Ignition Interlock Cable Routing
st a r t en gin e, sh ift t r a n sm ission in t o gea r, a n d n ot e
followin g:
PARK/NEUTRAL POSITION SWITCH
swit ch is t h e st a r t er-cir cu it t er m in a l. It pr ovides t h e
gr ou n d for t h e st a r t er solen oid cir cu it t h r ou gh t h e
select or lever in PARK a n d NE UTRAL posit ion s on ly.
Th e ou t er t er m in a ls on t h e swit ch a r e for t h e ba cku p
la m p cir cu it .
SWITCH TEST
Test for con t in u it y bet ween t h e cen t er t er m in a l a n d
t h e t r a n sm ission ca se. Con t in u it y sh ou ld exist on ly
wh en t h e t r a n sm ission is in PARK or NE UTRAL.
(4) Ra ise a n d su ppor t veh icle on sa fet y st a n ds,
(a ) If pr opeller sh a ft t u r n s bu t wh eels do n ot ,
pr oblem is wit h differ en t ia l or a xle sh a ft s.
(b) If pr opeller sh a ft does n ot t u r n a n d t r a n sm is-
sion is n oisy, st op en gin e. Rem ove oil pa n , a n d
ch eck for debr is. If pa n is clea r, r em ove t r a n sm is-
sion a n d ch eck for da m a ged dr ive pla t e, con ver t er,
oil pu m p, or in pu t sh a ft .
(c) If pr opeller sh a ft does n ot t u r n a n d t r a n sm is-
sion is n ot n oisy, per for m h ydr a u lic-pr essu r e t est t o
det er m in e if pr oblem is h ydr a u lic or m ech a n ica l.
Th e cen t er t er m in a l of t h e pa r k/n eu t r a l posit ion
To t est t h e swit ch , r em ove t h e wir in g con n ect or.
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