Jeep Cherokee 1999 Electronic Service Manual page 1200

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DI AGN OSI S AN D T EST I N G (Cont inue d)
(6) Ga in a ccess t o MAIN ME NU on DRB scr een .
(7) P r ess DVOM bu t t on on DRB.
(8) Usin g left /r igh t a r r ow keys, h igh ligh t CH AN-
NE L 1 fu n ct ion on DRB scr een .
(9) P r ess E NTE R t h r ee t im es.
(10) Usin g u p/down a r r ow keys, h igh ligh t RANGE
on DRB scr een (scr een will defa u lt t o 2 a m p sca le).
(11) P r ess E NTE R t o ch a n ge 2 a m p sca le t o 10
a m p sca le. Th is s te p m u s t be d o n e to p re v e n t
d a m a g e to D RB s c a n to o l o r LCS a d a p te r
(blo w n fu s e ).
(12) Rem ove cover fr om P ower Dist r ibu t ion Cen t er
(P DC).
(13) Rem ove fu el pu m p r ela y fr om P DC. Refer t o
la bel on P DC cover for r ela y loca t ion .
WARNING: BEFORE PROCEEDING TO NEXT STEP,
NOTE THE FUEL PUMP WILL BE ACTIVATED AND
SYSTEM PRESSURE WILL BE PRESENT. THIS WILL
OCCUR AFTER CONNECTING TEST LEADS FROM
LCS ADAPTER INTO FUEL PUMP RELAY CAVITIES.
THE FUEL PUMP WILL OPERATE EVEN WITH IGNI-
TION KEY IN OFF POSITION. BEFORE ATTACHING
TEST LEADS, BE SURE ALL FUEL LINES AND FUEL
SYSTEM COMPONENTS ARE CONNECTED.
CAUTION: TO PREVENT POSSIBLE DAMAGE TO
THE VEHICLE ELECTRICAL SYSTEM AND LCS
ADAPTER, THE TEST LEADS MUST BE CON-
NECTED INTO RELAY CAVITIES EXACTLY AS
SHOWN IN FOLLOWING STEPS.
Depen din g u pon veh icle m odel, yea r or en gin e con -
figu r a t ion , t h r ee differ en t t ypes of r ela ys m a y be
u sed: Type-1, t ype-2 a n d t ype–3.
(14) If equ ipped wit h ty p e –1 re la y (F ig. 10),
a t t a ch t est lea ds fr om LCS a da pt er in t o P DC r ela y
ca vit ies n u m ber 30 a n d 87. F or loca t ion of t h ese ca v-
it ies, r efer t o n u m ber s st a m ped t o bot t om of r ela y
(F ig. 10).
(15) If equ ipped wit h ty p e –2 re la y (F ig. 11),
a t t a ch t est lea ds fr om LCS a da pt er in t o P DC r ela y
ca vit ies n u m ber 30 a n d 87. F or loca t ion of t h ese ca v-
it ies, r efer t o n u m ber s st a m ped t o bot t om of r ela y
(F ig. 11).
(16) If equ ipped wit h ty p e –3 re la y (F ig. 12),
a t t a ch t est lea ds fr om LCS a da pt er in t o P DC r ela y
ca vit ies n u m ber 3 a n d 5. F or loca t ion of t h ese ca vi-
t ies, r efer t o n u m ber s st a m ped t o bot t om of r ela y
(F ig. 12).
(17) Wh en LCS a da pt er t est lea ds a r e a t t a ch ed in t o
r ela y ca vit ies, fu el pu m p w ill be a c tiv a te d . Det er m in e
fu el pu m p a m per a ge on DRB scr een . Am per a ge
sh ou ld be below 10.0 a m ps. If a m per a ge is below 10.0
a m ps, a n d specifica t ion s for t h e F u el P u m p P r essu r e,
Fig. 10 Type–1 Relay
Fig. 11 Type–2 Relay
Fig. 12 Type–3 Relay
F u el P u m p Ca pa cit y a n d F u el P r essu r e Lea k Down
t est s wer e m et , t h e fu el pu m p m odu le is OK.
FUEL SYSTEM 14 - 9