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14 - 28
FUEL SYSTEM—2.5L DIESEL ENGINE
DESCRI PT I ON AN D OPERAT I ON (Cont inue d)
Fig. 9 Vehicle Speed Sensor—Typical
Fig. 10 Vehicle Speed Sensor—4 Wheel Drive
In a ddit ion t o det er m in in g dist a n ce a n d veh icle
speed, t h e ou t pu t fr om t h e sen sor is u sed t o con t r ol
speed con t r ol oper a t ion .
SPEED CONTROL—ECM INPUT
Th e speed con t r ol syst em pr ovides five sepa r a t e
in pu t s t o t h e E CM: On /Off, Set , Resu m e/Accel, Ca n -
cel, a n d Decel. Th e On /Off in pu t in for m s t h e E CM
t h a t t h e speed con t r ol syst em h a s been a ct iva t ed.
Th e Set in pu t in for m s t h e E CM t h a t a fixed veh icle
speed h a s been select ed. Th e Resu m e in pu t in dica t es
t o t h e E CM t h a t t h e pr eviou s fixed speed is
r equ est ed.
Speed con t r ol oper a t ion will st a r t a t 50 km /h –142
km /h (35–85 m ph ). Th e u pper r a n ge of oper a t ion is
n ot r est r ict ed by veh icle speed. In pu t s t h a t effect
speed con t r ol oper a t ion a r e veh icle speed sen sor a n d
a cceler a t or peda l posit ion sen sor.
Refer t o Gr ou p 8H for fu r t h er speed con t r ol in for-
m a t ion .
ASD RELA Y—ECM INPUT
A 12 volt sign a l a t t h is in pu t in dica t es t o t h e E CM
t h a t t h e ASD r ela y h a s been a ct iva t ed. Th e ASD
r ela y is loca t ed in t h e P DC. Th e P DC is loca t ed n ext
t o t h e ba t t er y in t h e en gin e com pa r t m en t . F or t h e
loca t ion of t h e r ela y wit h in t h e P DC, r efer t o la bel on
P DC cover.
Th is in pu t is u sed on ly t o sen se t h a t t h e ASD r ela y
is en er gized. If t h e E CM does n ot see 12 volt s (+) a t
t h is in pu t wh en t h e ASD r ela y sh ou ld be a ct iva t ed, it
will set a Dia gn ost ic Tr ou ble Code (DTC).
FIVE VOLT POWER—ECM/PCM OUTPUT
Th is cir cu it su pplies a ppr oxim a t ely 5 volt s t o
power t h e Acceler a t or P eda l P osit ion Sen sor, a n d t h e
Boost / P r essu r e Sen sor.
ENGINE COOLANT GAUGE—PCM OUTPUT
Refer t o t h e In st r u m en t P a n el a n d Ga u ges gr ou p
for a ddit ion a l in for m a t ion .
ENGINE OIL PRESSURE GAUGE—PCM
OUTPUT
Refer t o t h e In st r u m en t P a n el a n d Ga u ges gr ou p
for a ddit ion a l in for m a t ion .
GLOW PLUG LAMP—PCM OUTPUT
Th e Glow P lu g la m p (m a lfu n ct ion in dica t or la m p)
illu m in a t es on t h e m essa ge cen t er ea ch t im e t h e ign i-
t ion (key) swit ch is t u r n ed on . It will st a y on for
a bou t t wo secon ds a s a bu lb t est .
Fig. 11 Glow Plug Lamp Symbol
SPEED CONTROL—PCM OUTPUTS
Th ese t wo cir cu it s con t r ol t h e fu el qu a n t it y a ct u a -
t or t o r egu la t e veh icle speed. Refer t o Gr ou p 8H for
Speed Con t r ol in for m a t ion .
AIR CONDITIONING RELA Y—ECM OUTPUT
Th is cir cu it con t r ols a gr ou n d sign a l for oper a t ion
of t h e A/C clu t ch r ela y. Also r efer t o Air Con dit ion in g
X J
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