Sprinter 2500 L5-2.7L DSL Turbo (2003)
The Engine Control Module transmits this data. A status of YES indicates that the compressor shut off because of an acceleration request. A status of
NO indicates that there is no acceleration request. If shut off due to an acceleration request, the compress will switch on again after 20 seconds. In
addition, the original acceleration request can no longer exist for the ECM to acknowledge a subsequent request. In the event of a CAN Bus
communication failure, NO is displayed as a substitute value.
Compres SO W/E-Off (Compressor Shut Off -Due to Emergency Off)
The Engine Control Module transmits this data. A status of YES indicates that the compressor shut off because of an emergency off request. A status of
NO indicates that there is no emergency off request. In the event of a CAN Bus communication failure, the last stored value is displayed as a substitute
value.
Auxiliary Fan
The ATC Module transmits this data. A status of ON indicates that the auxiliary fan is operational. A status of OFF indicates that the auxiliary fan is not
operational. The Auxiliary Fan normally operates when refrigerant head pressure exceeds 290 PSI and coolant temperature exceeds 221° F. In the event
of a CAN Bus communication failure, 257° F is displayed for coolant temperature (in Sensors) and the Auxiliary Fan will run continuously.
Light PB CTRL Module
This input displays a status of "Bright" for positive dimmer switch operation and "Dimmed" for negative dimmer switch operation. In the event of a
CAN Bus communication failure, "Bright" is displayed.
CABIN HEATER MODULE (CHM) & HEATER BOOSTER MODULE (HBM)
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.
-
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.
-
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.
-
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.
-
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.
-
Waxed fuel can obstruct the fuel line and reduce flow. Check for the appropriate winter grade fuel and replace as necessary.
The Cabin Heater Assembly and Heater Booster Assembly are supplemental type heaters designed to pre-heat the engine's coolant in order to supply the
vehicle's occupants with heat prior to the engine reaching operating temperature. The heater's control unit controls and monitors combustion operation
through various inputs and outputs that are contained inside the heater assembly. The supplemental heater connects to the vehicle's heater hoses and uses
a separate fuel supply line and fuel pump that connects to the vehicle's fuel tank. Unlike the Heater Booster, the Cabin Heater Assembly has an integral
coolant pump which allows heater operation without the vehicle's engine running. In addition, a programmable timer module can also be added to this
system. Neither the Cabin Heater Assembly nor the Heater Booster Assembly are connected to the CAN Bus. Communication between the heater's
control unit and the DRBIII(R) occurs through the Diagnostic Link Connector (DLC) via a K-Line.
VENTING THE HEATER'S EXHAUST
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. FAILURE TO FOLLOW THESE
