Symptom:
DOSING PUMP OPEN
Wh e n Mo n i to re d a n d S e t Co n d it i o n :
DOSING PUMP OPEN
Wh en Mon it or ed: Wit h t h e ign it ion on .
Set Con dit ion : This DTC will set if t he h ea ter ’s con t rol u n it det ect s a bn orm ally high
volt a ge on t h e Dosin g Pu m p cont r ol cir cuit .
POSSIBLE CAUSES
DOSI NG P U MP CON TROL CIRCU IT S H ORTE D H IGH
DOSI NG P U MP
DOSI NG P U MP CON TROL CIRCU IT OP E N
GROU ND CI RCUI T OP E N
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 Ca bin Hea t er or Hea t er Boost er ha r n ess con nect or.
Tur n th e ign it ion on .
Mea su r e th e volt a ge bet ween th e Dosin g Pu m p Con t r ol cir cu it a n d gr ou n d.
Is t h e volt a ge above 0.2 volt s?
All
Ye s → Repa ir t h e Dosin g P u m p Con t r ol cir cu it for a sh or t to volt a ge.
Per for m H E ATE R VERIF ICATION TE ST - VER 1.
No → Go To 2
78
CABI N H EAT ER
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