Symptom:
DOSING PUMP SHORTED
POSSIBLE CAUSES
DOSI NG P U MP SH ORTE D TO GROUN D
DOSI NG P U MP CON TROL CIRCU IT S H ORTE D TO GROU N D CI RCUIT
DOSI NG P U MP CON TROL CIRCU IT S H ORTE D TO GROU N D
CABIN H EATE R OR HE ATE R BOOSTE R CONTROL UN IT
TE S T ACTION AP PLICAB ILITY
1 WA R N I N G : N E V E R O P E R AT E T H E H E AT E R I N A N E N C L O S E D A R E A
TH AT D OES N OT HAVE EXH AU S T VEN TILATION FACILITIES . A LWAYS
VEN T THE EXHAU S T WHE N OP ERATIN G THE HE ATER. F AILU R E TO
FOLLOW TH ES E IN S TRU CTIONS CAN RES U LT IN P E RS ON AL IN J U RY
OR D E ATH .
WA R N I N G : A L L O W T H E H E AT E R A S S E M B LY T O C O O L B E F O R E P E R -
FOR MIN G A COMP ON EN T INS P E CTION /RE PAIR /REP LACE MEN T. FAIL-
UR E TO F OLLOW THES E IN STR U CTION S CAN RE SU LT IN P E RS ON AL
IN JU RY OR D E ATH .
CAU TION : D O N OT P E R F ORM TH IS TE S T U N LES S D IRE CTE D H ER E B Y
TH E HEATER P RE -TES T. ALWAYS P ERF ORM THE HEATER P RE-TES T
P RIOR TO P ERF ORMING AN Y OTHER TES T F OR TH E R ES U LT TO BE
VAL I D .
Tur n th e ign it ion off.
NOTE: Ch e c k c o n n e c to rs - Cle an /re pa i r a s n e c e ss a ry.
Discon n ect t he Dosin g P u m p ha r n ess con n ect or.
Tur n th e ign it ion on .
Ver ify t h a t th e Ca bin H ea t er or Hea t er Booster is swit ch ed off.
Set t h e blen d con t r ol t o th e m a x h ea t posit ion a n d t he m ode cont r ol t o th e floor
posit ion .
Wit h th e DRBIII", er a se t he Ca bin Hea t er or Hea t er Boost er Modu le’s DTCs.
St a r t th e engin e. Allow th e en gin e t o idle.
Wit h t h e DRBIII, mon itor for Ca bin H ea t er or H ea t er Boost er Module DTCs wh ile
per for m in g t h e followin g st ep.
NOTE: Do not disconnect the vehicle’s battery or the heater’s main power
su p p ly w hi le th e h e at e r is i n o p e ra tio n or i n ru n -d o w n m o d e . Fa i lu re to
fo ll o w t h e s e i n s t ru c t i o n s c a n r e s u l t i n e x c es s e mi s s io ns fr o m t h e hea t e r
during heater operation.
Swit ch t h e Ca bin H ea t er or H ea t er Boost er on . If necessar y, allow t h e hea t er t o ru n
th r ou gh at lea st on e cycle of oper a t ion (a ppr oxim a t ely 10 m in u t es), a nd th en swit ch
th e h eat er off.
Tur n th e en gin e off.
Does t h e DRBIII" display: DOSING PUMP H IGH OR OPE N?
All
Ye s → Repla ce t he Dosin g P u m p in a ccor da n ce wit h t he Ser vice In for-
ma t ion.
Per for m H E ATE R VERIF ICATION TE ST - VER 1.
No → Go To 2
81
CABI N H EAT ER
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