Dodge Sprinter 2006 Manual page 944

8J - 30 INSTRUMENT CLUSTER
det ect ed in t h e fu el filt er. Th is in dica t or is con t r olled
by a t r a n sist or on t h e in st r u m en t clu st er cir cu it
boa r d ba sed u pon t h e clu st er pr ogr a m m in g a n d elec-
t r on ic m essa ges r eceived by t h e clu st er fr om t h e
E n gin e Con t r ol Modu le (E CM) over t h e Con t r oller
Ar ea Net wor k (CAN) da t a bu s. Th e wa t er-in -fu el
in dica t or Ligh t E m it t in g Diode (LE D) is com plet ely
con t r olled by t h e in st r u m en t clu st er logic cir cu it , a n d
t h a t logic will on ly a llow t h is in dica t or t o oper a t e
wh en t h e in st r u m en t clu st er det ect s t h a t t h e ign it ion
swit ch is in t h e On posit ion . Th er efor e, t h e LE D will
a lwa ys be off wh en t h e ign it ion swit ch is in a n y posi-
t ion except On . Th e LE D on ly illu m in a t es wh en it is
pr ovided a pa t h t o gr ou n d by t h e in st r u m en t clu st er
t r a n sist or. Th e in st r u m en t clu st er will t u r n on t h e
wa t er-in -fu el in dica t or for t h e followin g r ea son s:
• B u lb Te s t - E a ch t im e t h e ign it ion swit ch is
t u r n ed t o t h e On posit ion t h e wa t er-in -fu el in dica t or
is illu m in a t ed for a bou t seven secon ds a s a bu lb t est .
• Wa te r-In -F u e l La m p -On Me s s a g e - E a ch t im e
t h e clu st er r eceives a wa t er-in -fu el la m p-on m essa ge
fr om t h e E CM in dica t in g t h a t t h er e is excessive
wa t er in t h e fu el filt er wit h t h e en gin e r u n n in g, t h e
wa t er-in -fu el in dica t or will be illu m in a t ed. Th e in di-
ca t or r em a in s illu m in a t ed u n t il t h e clu st er r eceives a
wa t er-in -fu el la m p-off m essa ge, or u n t il t h e ign it ion
swit ch is t u r n ed t o t h e Off posit ion , wh ich ever occu r s
fir st .
Th e E CM con t in u a lly m on it or s t h e wa t er-in -fu el
sen sor t o det er m in e wh et h er t h er e is excessive wa t er
in t h e fu el filt er. Th e E CM t h en sen ds t h e pr oper
wa t er-in -fu el la m p-on a n d la m p-off m essa ges t o t h e
in st r u m en t clu st er. If t h e wa t er-in -fu el in dica t or
r em a in s illu m in a t ed wit h t h e en gin e r u n n in g, excess
wa t er sh ou ld be dr a in ed fr om t h e fu el filt er. If t h e
in dica t or r em a in s illu m in a t ed wit h t h e en gin e r u n -
n in g a ft er t h e wa t er h a s been dr a in ed fr om t h e fu el
filt er, it m a y in dica t e t h a t
occu r r ed in t h e wa t er-in -fu el sen sor or cir cu it s. Th e
E CM will st or e a Dia gn ost ic Tr ou ble Code (DTC) for
a n y m a lfu n ct ion it det ect s. F or pr oper dia gn osis of
t h e wa t er-in -fu el sen sor a n d cir cu it s, t h e E CM, t h e
CAN da t a bu s, or t h e elect r on ic m essa ge in pu t s t o
t h e in st r u m en t clu st er t h a t con t r ol t h e wa t er-in -fu el
in dica t or, a dia gn ost ic sca n t ool is r equ ir ed. Refer t o
t h e a ppr opr ia t e dia gn ost ic in for m a t ion .
a m a lfu n ct ion h a s
VA