Can Bus - Dodge Sprinter 2006 Manual

3.2.2 CAN BUS

Th e CAN bu s (con t r oller a r ea n et wor k) is a da t a
bu s syst em specifica lly design for in t er m odu le
com m u n ica t ion on t h is veh icle. Th e CAN bu s con -
sist s of a specia l t wist ed t wo-cor e ca ble. Con t r ol
m odu les a r e con n ect ed t o t h is t wist ed pa ir . Th e
CAN bu s in cor por a t es t wo t er m in a t in g r esist or s.
On e t er m in a t or is bu ilt in t o t h e E n gin e Con t r ol
Modu le (E CM) a n d t h e ot h er is bu ilt in t o t h e Sen t r y
Key Rem ot e E n t r y Modu le (SKRE E M). E a ch r esis-
t or h a s a va lu e of 120 oh m s. Th e r esist or con dit ion
ca n be con fir m ed by discon n ect in g t h e con t r ol m od-
u le a n d m ea su r in g t h e r esist a n ce va lu e a t t h e
a ppr opr ia t e con t r ol m odu le pin s. Th is m ea su r e-
m en t sh ou ld r ea d 120 oh m s. Th e t wo CAN cir cu it s,
CAN C Bu s (+) a n d CAN C Bu s (-), a r e br idged by
t h ese t wo t er m in a t in g r esist or s wh en a ll con t r ol
m odu les a r e con n ect ed t o t h e bu s. Th ese t wo r esis-
t or s a r e con n ect ed t o t h e CAN bu s n et wor k in
pa r a llel. Th e m ea su r em en t
t wist ed CAN cir cu it s, wit h bot h t h e E CM a n d
SKRE E M con n ect ed, sh ou ld m ea su r e a va lu e of 60
oh m s.
Th e CAN bu s is bi-dir ect ion a l. Th is m ea n s t h a t
ea ch con n ect ed con t r ol m odu le ca n sen d a n d r eceive
in for m a t ion . Tr a n sm ission of da t a t a kes pla ce r e-
du n da n t ly via bot h cir cu it s. Th e da t a bu s levels a r e
m ir r or ed, m ea n in g t h a t if t h e bin a r y level on on e
cir cu it is 0, t h e ot h er cir cu it t r a n sm it s bin a r y level
1 a n d vice ver sa . Th e t wo lin e con cept is u sed for
t wo r ea son s: for fa u lt iden t ifica t ion a n d a s a sa fet y
con cept .
If a volt a ge pea k occu r s on ju st on e cir cu it , t h e
r eceiver s ca n iden t ify t h is a s a fa u lt a n d ign or e t h e
volt a ge pea k. If a sh or t cir cu it or in t er r u pt ion
occu r s on on e of t h e t wo CAN cir cu it s, a soft wa r e-
h a r dwa r e lin ked sa fet y con cept a llows swit ch in g t o
a sin gle-lin e oper a t ion . Th e defect ive CAN cir cu it is
sh u t down . A specific da t a pr ot ocol con t r ols h ow a n d
wh en t h e pa r t icipa n t s ca n sen d a n d r eceive.
NOTE: It is important to note the CAN Bus
circuits are used
communication only,
connected to the K-Lines.
Th e followin g m odu les t h a t u se t h e CAN Bu s on
t h is veh icle a r e:
Au t om a t ic Tem per a t u r e Con t r ol (ATC)
•
Con t r oller An t ilock Br a ke (CAB)
•
E n gin e Con t r ol Modu le (E CM)
•
In st r u m en t Clu st er (IC)
•
Sen t r y Key Rem ot e E n t r y Modu le (SKRE E M)
•
Sh ift er Assem bly (SA)
•
Tr a n sm ission Con t r ol Modu le (TCM)
•
bet ween t h e t wo
for inter-module
and is no way
GEN ERAL I N FORM AT I ON
3.3 HEA TING & A/C SYSTEM
3.3.1 AUTOMA TIC TEMPERA TURE
CONTROL (A TC)
3.3.1.1 SYSTEM CONTROLS
Th e ATC Modu le:
is fu lly a ddr essa ble wit h t h e DRBIII .
•
¼ Th e DRBIII com m u n ica t es wit h t h e ATC
Modu le t h r ou gh t h e Dia gn ost ic Lin k Con n ect or
(DLC) via a K-Lin e.
com m u n ica t es wit h ot h er m odu les over t h e Con -
•
t r oller Ar ea Net wor k (CAN) C Bu s.
con t r ols A/C clu t ch oper a t ion .
•
con t r ols E BL oper a t ion .
•
con t r ols wa t er cycle va lve oper a t ion .
•
¼
Th e wa t er cycle va lve is a n or m a lly open va lve,
m ea n in g t h a t it a llows fu ll en gin e coola n t flow
t h r ou gh t h e h ea t er cor e wh en n o power is
deliver ed t o t h e va lve. Th e ATC con t r ols t h e
va lve wit h a pu lse widt h sign a l. Th e lower t h e
per cen t a ge of t h e pu lse widt h sign a l t h e m or e
t h e va lve is open .
con t r ols Residu a l H ea t Ut iliza t ion (RE ST) fu n c-
•
t ion .
con t r ols blower m ot or oper a t ion , pr ovidin g fou r
•
blower speeds (Low, M1, M2, & H igh ).
con t r ols r ecir cu la t ion a ir solen oid va lve.
•
con t r ols t h e m ode door via ca bles.
•
con t r ols t h e m a in power su pply t o t h e H ea t er
•
Boost er (if equ ipped).
u ses a ir in let t em per a t u r e sen sor, a ir ou t let t em -
•
per a t u r e sen sor, a n d eva por a t or t em per a t u r e
sen sor in pu t , a s well a s da t a fr om ot h er m odu les
t o m a in t a in occu pa n t com for t levels.
3.3.1.2 SYSTEM DIAGNOSTICS
F a u lt det ect ion is t h r ou gh a ct ive a n d st or ed Dia g-
n ost ic Tr ou ble Codes (DTCs)
DTCs a r e displa yed by t h e DRBIII .
•
Act ive DTCs a r e t h ose wh ich cu r r en t ly exist in
•
t h e syst em . Th e con dit ion ca u sin g t h e fa u lt m u st
be r epa ir ed in or der t o clea r t h is t ype of DTC.
St or ed DTCs a r e t h ose wh ich occu r r ed in t h e
•
syst em sin ce t h e ATC Modu le r eceived t h e la st
clea r dia gn ost ic in fo m essa ge.
Testing Preparation & Diagnostics
Set t h e n ecessa r y syst em fu n ct ion s a ccor din gly so
t h a t a ll of t h e followin g pr er equ isit es a r e m et pr ior
t o per for m in g dia gn ost ic t est s on t h e ATC syst em :
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