1.0 INTRODUCTION
Th e pr ocedu res con t ain ed in t h is m a nu a l in clu de
all specifica t ion s, in st r uct ions a nd gr a ph ics n eeded
to dia gnose en gin e cont rol m odu le (ECM) a nd sen -
tr y key rem ot e en t ry modu le (SKRE E M) pr oblem s;
th ey a r e no st ar t , dia gn ost ic tr ou ble code (DTC) a nd
no tr ou ble code pr oblem s for t he E CM. Th e dia gn os-
tics in t h is m a n ua l a re ba sed on t he tr ouble condi-
tion or sym pt om bein g presen t a t t he tim e of dia g-
nosis.
Wh en r epa ir s a re requ ired, r efer t o th e appropr i-
at e ser vice infor m at ion for t he pr oper rem ova l a n d
repa ir pr ocedu r e.
Dia gn ost ic pr ocedu r es ch a nge ever y yea r. N ew
dia gn ost ic syst em s ma y be added; ca r ryover sys-
tem s ma y be en ha n ced. IT IS RE COMME N DE D
TH AT YOU RE VIE W TH E E NTIRE MANUAL TO
BE COME FAMILIAR WITH ALL NE W AND
CH ANGE D DIAGNOSTIC PROCE DURE S.
Th is m an u al will cover all t he necessa ry r equ ire-
men t s t o begin a logica l dia gn ost ic pa th for each
pr oblem . If th er e is a diagn ost ic tr ou ble code (DTC)
detect ed, go t o t he tr ou ble code t est . If t her e a r e n o
DTCs pr esen t, go to a n o t rou ble code (*), sym pt om
ba sed t est .
Th is book reflect s m an y su ggest ed cha n ges fr om
rea der s of pa st issu es. Aft er u sing t h is book , if you
ha ve a ny comm en ts or r ecom men da t ion s, plea se fill
out th e form a t t h e ba ck of t h e book a nd m ail it ba ck
to us.
1.1 S Y S T EM COV ER AGE
Th is dia gn ost ic pr ocedu res m a n ua l covers 2005
Spr in t er veh icles equ ipped wit h t h e 2.7L com m on
rail diesel engine.
1.2 SIX-STEP TROUBLESHOOTING
PROCEDURE
Dia gn osis of the engin e cont r ol m odu le (E CM)
an d sen t ry k ey im mobilizer syst em (SKRE E M) is
don e in six basic st eps:
• ver ifica t ion of com pla int
• ver ifica t ion of a ny r ela t ed sym pt om
• sym pt om a na lysis
• pr oblem isola t ion
• repa ir of isola t ed pr oblem
• ver ifica t ion of pr oper opera t ion
NOTE: All tests in this manual should be per-
formed with the engine at operating temperature,
unless otherwise specified within a particular test.
2.0 IDENTIFICATION OF
SY ST EM
Th e E CM is loca t ed t o t he left of t h e st eer ing
colu m n behin d t h e st eer in g colu m n open in g cover.
Th e sen t ry r em ote en t ry m odu le (SKRE E M) is
at t ach ed t o th e r ea r of t he inst r u men t clu st er.
3.0 SYSTEM DESCRIPTION AND
FU N CT I ON AL OPERAT I ON
3.1 GENERAL DESCRIPTION
Th e 2.7L dir ect in ject ion diesel en gin e syst em is
equ ipped wit h t h e la t est t ech nica l a dva n ces. Th e
on-boa r d dia gn ost ics in cor por at ed in th e en gin e
cont r ol modu le a n d SKREE M ar e in t ended t o a ssist
th e field t echn icia n in r epa ir in g vehicle pr oblem s by
th e quickest m ea n s.
Th e en gin e system in corpora t es a com mon ra il
fuel deliver y design wit h exh au st em ission feed-
ba ck. Th is design u t ilizes elect r on ica lly con tr olled
solen oid va lve t ype fu el in ject ors. Ea ch in ject or is
cont r olled in dividu ally by th e E CM. In ject or tim in g
an d fuel qua n tit y a r e cont r olled by th e E CM ba sed
on in pu ts fr om va r iou s sen sor s. Th e pr ecision con -
tr ol of t h e in ject or s by t h e E CM h elps to redu ce th e
en gin e noise, odor a n d sm oke.
3.2 FUNCTIONAL OPERATION
3.2.1 ECM ON-BOARD DIAGNOSTICS
Th e E CM is pr ogr a mm ed to m on it or differ en t
cir cu it s of t h e diesel fu el inject ion system . Th is
mon it or in g is called on -boa rd dia gn ost ics.
Cer t ain cr it er ia m ust be met for a dia gn ost ic
tr ou ble code t o be en ter ed in t o t he E CM m em or y.
Th e cr it er ia m ay be a ra n ge of: en gin e r pm , en gin e
tem per at u re, t im e or oth er in pu t sign a ls t o t he
ECM. If a ll of t he crit er ia for mon it or in g a syst em or
cir cu it a r e m et , a nd a pr oblem is sen sed, th en a
DTC will be st ored in t he ECM mem or y.
It is possible t h at a DTC for a mon it or ed cir cu it
ma y n ot be en ter ed in t o t h e E CM mem or y, even
th ou gh a m a lfu n ction h as occur r ed. Th is m a y ha p-
pen wh en th e mon itor in g cr it er ia h ave n ot been
met.
Th e ECM com pa res in pu t sign al volt ages fr om
ea ch inpu t device wit h specifica tion s (t he est ab-
lish ed high a n d low lim it s of th e in pu t r a nge) th a t
ar e pr ogr am m ed in to it for t h at device. If t h e in pu t
volt age is n ot wit h in t h e specifica t ion s a n d oth er
tr ou ble code crit er ia a r e m et, a DTC will be st ored
in t h e E CM m em or y.
1
GEN ERAL I N FORM AT I ON
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