Jeep Cherokee 1999 Electronic Service Manual page 1228

X J
DI AGN OSI S AN D T EST I N G (Cont inue d)
Fig. 19 Ignition Coil—2.5L Engine
Fig. 20 Ignition Coil—4.0L Engine
posit ion sen sor wir e con n ect or (a t dist r ibu t or ) is
fir m ly con n ect ed t o h a r n ess con n ect or. In spect spa r k
plu g con dit ion . Con n ect veh icle t o a n oscilloscope a n d
in spect spa r k even t s for fou led or da m a ged spa r k
plu gs or ca bles. Refer t o Gr ou p 8D, Ign it ion Syst em
for a ddit ion a l in for m a t ion .
(6) Ver ify gen er a t or ou t pu t wir e, gen er a t or con n ec-
t or a n d gr ou n d wir e a r e fir m ly con n ect ed t o gen er a -
t or.
(7) In spect syst em body gr ou n ds for loose or dir t y
con n ect ion s. Refer t o Gr ou p 8, Wir in g for gr ou n d
loca t ion s.
(8) Ver ify cr a n kca se ven t ila t ion (CCV) oper a t ion .
Refer t o Gr ou p 25, E m ission Con t r ol Syst em for a ddi-
t ion a l in for m a t ion .
(9) In spect fu el t u be qu ick-con n ect fit t in g-t o-fu el
r a il con n ect ion s.
(10) Ver ify h ose con n ect ion s t o a ll por t s of va cu u m
fit t in gs on in t a ke m a n ifold a r e t igh t a n d n ot lea kin g.
(11) In spect a cceler a t or ca ble, t r a n sm ission t h r ot -
t le ca ble (if equ ipped) a n d cr u ise con t r ol ca ble con -
n ect ion s (if equ ipped). Ch eck t h eir con n ect ion s t o
t h r ot t le a r m of t h r ot t le body for a n y bin din g or
r est r ict ion s.
(12) If equ ipped wit h va cu u m br a ke boost er, ver ify
va cu u m boost er h ose is fir m ly con n ect ed t o fit t in g on
in t a ke m a n ifold. Also ch eck con n ect ion t o br a ke va c-
u u m boost er.
(13) In spect a ir clea n er in let a n d a ir clea n er ele-
m en t for dir t or r est r ict ion s.
(14) In spect r a dia t or gr ille a r ea , r a dia t or fin s a n d
a ir con dit ion in g con den ser for r est r ict ion s.
(15) Ver ify in t a ke m a n ifold a ir t em per a t u r e sen sor
wir e con n ect or is fir m ly con n ect ed t o h a r n ess con n ec-
t or (F ig. 21) or (F ig. 22).
Fig. 21 Intake Manifold Air Temp. Sensor Location—
2.5L Engine
(16) Ver ify MAP sen sor elect r ica l con n ect or is
fir m ly con n ect ed t o MAP sen sor (F ig. 22). Also ver ify
r u bber L-sh a ped fit t in g fr om MAP sen sor t o t h r ot t le
body is fir m ly con n ect ed (F ig. 23).
(17) Ver ify fu el in ject or wir e h a r n ess con n ect or s
a r e fir m ly con n ect ed t o in ject or s in cor r ect or der.
E a ch h a r n ess con n ect or is n u m er ica lly t a gged wit h
in ject or n u m ber (INJ 1, INJ 2 et c.) of it s cor r espon d-
in g fu el in ject or a n d cylin der n u m ber.
(18) Ver ify h a r n ess con n ect or s a r e fir m ly con -
n ect ed t o idle a ir con t r ol (IAC) m ot or a n d t h r ot t le
posit ion sen sor (TP S) (F ig. 22).
(19) Ver ify wir e h a r n ess con n ect or is fir m ly con -
n ect ed t o en gin e coola n t t em per a t u r e sen sor (F ig.
24).
FUEL SYSTEM 14 - 37