Co m p r e s S O Ac c e l (Co mp res s o r S h u t Off - D u e
To Ac c e le ra t i o n )
Th e En gin e Con t rol Modu le tra n sm it s t his da ta . A
st at u s of #YE S# indica tes t h at t he compr essor shu t
off beca u se of a n a cceler at ion requ est . A sta t us of
#NO# in dica tes th a t t her e is no acceler at ion requ est .
If sh u t off du e t o a n a cceler a tion requ est , t he
compr ess will swit ch on a ga in a ft er 20 secon ds. In
addit ion , t h e or igina l a cceler at ion requ est can n o
lon ger exist for t h e E CM to ackn owledge a su bse-
qu en t r equ est . In t h e even t of a CAN Bu s com m u-
nica tion fa ilu re, #NO# is d is p layed as a s ub s titute
value .
Co m p re s SO W/E-Off (Co m p re s s or Sh u t Off -
Due to Emergency Off)
Th e En gin e Con t rol Modu le tra n sm it s t his da ta . A
st at u s of #YE S# indica tes t h at t he compr essor shu t
off beca use of a n em er gen cy off requ est . A st a t u s of
#NO# in dica t es t ha t t h ere is n o emer gen cy off r e-
qu est . In th e even t of a CAN Bus com m un ica tion
failu r e, th e la st st or ed va lu e is displa yed a s a
substitu te value.
Auxil iar y Fan
Th e ATC Modu le t r a nsm it s t his dat a . A st a tu s of
#ON # in dica tes t ha t th e a uxilia ry fa n is oper at ion al.
A st at u s of #OF F # in dica tes th a t th e a uxiliar y fa n is
not oper a t ion a l. Th e Auxilia r y Fa n n or ma lly oper-
at es wh en r efr iger an t h ea d pressu r e exceeds 290
PSI an d coola n t t em per a t ur e exceeds 221°F. In th e
even t of a CAN Bu s com mu n ica t ion fa ilu re, 257°F is
displa yed for coola n t t em per a t u r e (in Sen sor s) a nd
th e Au xilia ry F a n will ru n cont inu ou sly.
Li g h t PB CTR L Mo d u le
Th is in pu t displa ys a st at u s of #Br igh t # for posit ive
dim m er swit ch oper at ion a n d #Dim m ed# for n ega -
tive dim mer swit ch oper a tion . In t he even t of a CAN
Bu s com m un ica tion fa ilu re, #Br igh t # is d is p laye d .
3.3.2 CABIN HEATER MODULE (CHM) &
HEATER BOOSTER MODULE (HBM)
3.3.2.1 SYSTEM DESCRIPTION
WARNING: NEVER OPERATE THE HEATER
IN AN ENCLOSED AREA THAT DOES NOT
HAVE EXHAUST VENTILATION FACILITIES.
ALWAYS VENT THE HEATER’S EXHAUST
WHEN OPERATING THE HEATER. REFER TO
$VENTING THE HEATER’S EXHAUST$
BELOW FOR PROPER EXHAUST VENTING
INSTRUCTIONS. FAILURE TO FOLLOW
THESE INSTRUCTIONS CAN RESULT IN
PERSONAL INJURY OR DEATH.
WARNING: ALLOW THE HEATER ASSEMBLY TO
COOL BEFORE PERFORMING A COMPONENT
INSPECTION/REPAIR/REPLACEMENT. FAILURE
TO FOLLOW THESE INSTRUCTIONS CAN
RESULT IN PERSONAL INJURY OR DEATH.
WARNING: ALWAYS DISCONNECT THE
VEHICLE’S BATTERY PRIOR TO
PERFORMING ANY TYPE OF WORK ON THE
HEATER ASSEMBLY. FAILURE TO FOLLOW
THESE INSTRUCTIONS CAN RESULT IN
PERSONAL INJURY OR DEATH.
WARNING: NEVER ATTEMPT TO REPAIR THE
HEATER ASSEMBLY OR ANY OF ITS
INTERNAL COMPONENTS. ALWAYS
PERFORM HEATER COMPONENT
REPLACEMENT IN ACCORDANCE WITH THE
SERVICE INFORMATION. FAILURE TO
FOLLOW THESE INSTRUCTIONS CAN
RESULT IN PERSONAL INJURY OR DEATH.
CAUTION: Always Perform The Heater
Pre-Test (In The Diagnostic Procedures) Prior
To Performing Any Other Test On The Heater
For The Test Result To Be Valid.
NOTE: Do not disconnect the vehicle’s
battery or the heater’s main power-supply
while the heater is in operation or in
run-down mode. Failure to follow these
instructions may result in excess emissions
from the heater.
NOTE: Failure to prime the Dosing Pump
after draining the fuel line will prevent heater
activation during the first attempt to start the
unit. This may also set a Diagnostic Trouble
Code (DTC) in the control unit’s memory. Do
not perform the Dosing Pump Priming
Procedure if an attempt was made to start the
heater without priming the Dosing Pump
first. This will put excess fuel in the heater
module and cause smoke to emit from the
heater’s exhaust pipe when heater activation
occurs.
NOTE: Waxed fuel can obstruct the fuel line
and reduce flow. Check for the appropriate
winter grade fuel and replace as necessary.
Th e Ca bin H ea t er Assem bly a nd H ea t er Boost er
Assem bly ar e su pplem en ta l type h eat er s design ed
to pr e-h ea t t h e en gin e’s coola nt in or der t o su pply
th e veh icle’s occupa n t s wit h hea t pr ior t o t h e en gin e
7
GEN ERAL I N FORM AT I ON
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