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14 - 10
FUEL SYSTEM
DI AGN OSI S AN D T EST I N G (Cont inue d)
(18) If a m per a ge is m or e t h a n 10.0 a m ps, r epla ce
fu el pu m p m odu le a ssem bly. Th e elect r ic fu el pu m p
is n ot ser viced sepa r a t ely.
(19) Discon n ect t est lea ds fr om r ela y ca vit ies
im m edia t ely a ft er t est in g.
FUEL GAUGE SENDING UNIT
Th e fu el ga u ge sen din g u n it con t a in s a va r ia ble
r esist or (t r a ck). As t h e floa t m oves u p or down , elec-
t r ica l r esist a n ce will ch a n ge. Refer t o In st r u m en t
P a n el a n d Ga u ges for F u el Ga u ge t est in g. To t est t h e
ga u ge sen din g u n it on ly, it m u st be r em oved fr om
veh icle. Th e u n it is pa r t of t h e fu el pu m p m odu le.
Refer t o F u el P u m p Modu le Rem ova l/In st a lla t ion for
pr ocedu r es. Mea su r e t h e r esist a n ce a cr oss t h e sen d-
in g u n it t er m in a ls. Wit h floa t in u p posit ion , r esis-
t a n ce sh ou ld be 20 oh m s (+/- 5%). Wit h floa t in down
posit ion , r esist a n ce sh ou ld be 270 oh m s (+/- 5%).
FUEL INJECTOR TEST
To per for m a com plet e t est of t h e fu el in ject or s a n d
t h eir cir cu it r y, u se t h e DRB sca n t ool a n d r efer t o t h e
a ppr opr ia t e P ower t r a in Dia gn ost ics P r ocedu r es m a n -
u a l. To t est t h e in ject or on ly, r efer t o t h e followin g:
Discon n ect t h e fu el in ject or wir e h a r n ess con n ect or
fr om t h e in ject or. Th e in ject or is equ ipped wit h 2
elect r ica l t er m in a ls (pin s). P la ce a n oh m m et er a cr oss
t h e t er m in a ls. Resist a n ce r ea din g sh ou ld be a ppr oxi-
m a t ely 12 oh m s
1.2 oh m s a t 20°C (68°F ).
SERV I CE PROCEDU RES
FUEL SYSTEM PRESSURE RELEASE
PROCEDURE
U s e fo llo w in g p ro c e d u re if fu e l ra il is o r is
n o t e qu ip p e d w ith fu e l p re s s u re te s t p o rt.
(1) Rem ove fu el fill ca p.
(2) Th e fu el filler t u be con t a in s a spr in g-loa ded
fla p (door ) loca t ed below fu el fill ca p. Th e fla p is u sed
a s a secon da r y wa y of sea lin g fu el t a n k if fu el fill ca p
h a s n ot been pr oper ly t igh t en ed. It is pa r t of E VAP
m on it or syst em wh en veh icle is equ ipped wit h a
Lea k Det ect ion P u m p (LDP ). Th e v e h ic le m a y be
e qu ip p e d w ith fla p in s ta lle d in to fu e l fille r tu be
e v e n th o u g h v e h ic le is n o t e qu ip p e d w ith LD P
a n d EVAP m o n ito r s y s te m . P la ce a n on m et a llic
object in t o fu el fill t u be a n d pr ess on fla p t o r elieve
a n y t a n k pr essu r e.
(3) Rem ove F u el P u m p r ela y fr om P ower Dist r ibu -
t ion Cen t er (P DC). F or loca t ion of r ela y, r efer t o la bel
on u n der side of P DC cover.
(4) St a r t a n d r u n en gin e u n t il it st a lls.
(5) At t em pt r est a r t in g en gin e u n t il it will n o
lon ger r u n .
(6) Tu r n ign it ion key t o OF F posit ion .
CAUTION: Steps 1, 2, 3 and 4 must be performed to
relieve high pressure fuel from within fuel rail. Do
not attempt to use following steps to relieve this
pressure as excessive fuel will be forced into a cyl-
inder chamber.
(7) Un plu g con n ect or fr om a n y fu el in ject or.
(8) At t a ch on e en d of a ju m per wir e wit h a lliga t or
clips (18 ga u ge or sm a ller ) t o eit h er in ject or t er m in a l.
(9) Con n ect ot h er en d of ju m per wir e t o posit ive
side of ba t t er y.
(10) Con n ect on e en d of a secon d ju m per wir e t o
r em a in in g in ject or t er m in a l.
CAUTION: Powering an injector for more than a few
seconds will permanently damage the injector.
(11) Mom en t a r ily t ou ch ot h er en d of ju m per wir e
t o n ega t ive t er m in a l of ba t t er y for n o m or e t h a n a
few secon ds.
(12) P la ce a r a g or t owel below fu el lin e qu ick-con -
n ect fit t in g a t fu el r a il.
(13) Discon n ect qu ick-con n ect fit t in g a t fu el r a il.
Refer t o Qu ick-Con n ect F it t in gs.
(14) Ret u r n fu el pu m p r ela y t o P DC.
(15) On e or m or e Dia gn ost ic Tr ou ble Codes (DTC's)
m a y h a ve been st or ed in P CM m em or y du e t o fu el
pu m p r ela y r em ova l. Th e DRB sca n t ool m u st be
u sed t o er a se a DTC.
FUEL TUBES/LINES/HOSES AND CLAMPS
OPERA TION
Also r efer t o Qu ick-Con n ect F it t in gs.
WARNING: THE FUEL SYSTEM IS UNDER A CON-
STANT PRESSURE (EVEN WITH THE ENGINE OFF).
BEFORE SERVICING ANY FUEL SYSTEM HOSES,
FITTINGS OR LINES, THE FUEL SYSTEM PRES-
SURE MUST BE RELEASED. REFER TO THE FUEL
SYSTEM PRESSURE RELEASE PROCEDURE IN
THIS GROUP.
In spect a ll h ose con n ect ion s su ch a s cla m ps, cou -
plin gs a n d fit t in gs t o m a ke su r e t h ey a r e secu r e a n d
lea ks a r e n ot pr esen t . Th e com pon en t sh ou ld be
r epla ced im m edia t ely if t h er e is a n y eviden ce of deg-
r a da t ion t h a t cou ld r esu lt in fa ilu r e.
Never a t t em pt t o r epa ir a pla st ic fu el lin e/t u be.
Repla ce a s n ecessa r y.
Avoid con t a ct of a n y fu el t u bes/h oses wit h ot h er
veh icle com pon en t s t h a t cou ld ca u se a br a sion s or
scu ffin g. Be su r e t h a t t h e pla st ic fu el lin es/t u bes a r e
pr oper ly r ou t ed t o pr even t pin ch in g a n d t o a void h ea t
sou r ces.
Th e lin es/t u bes/h oses u sed on fu el in ject ed veh icles
a r e of a specia l con st r u ct ion . Th is is du e t o t h e
X J
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