:  Dec 17, 2007



Overview

The fuel fired booster heater is installed to diesel engine variants in many markets.

For information on the description and operation of the system, refer to section 412-02 - Auxiliary Heating in the workshop manual.

Inspection and Verification

. Verify the customer concern.

. Visually inspect for obvious mechanical or electrical faults.

Mechanical Electrical
  • Fuel fired heater assembly Combustion air fan Coolant inlet/outlet Heat exchanger Temperature sensor Exhaust Fuel inlet Air inlet Evaporator
  • Auxiliary fuel pump and lines
  • Auxiliary coolant pump
  • Fuses
  • Harnesses
  • Electrical connector(s)
  • Controller area network (CAN) circuits
  • Control module(s)

. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step

. Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before moving onto the symptom chart or DTC index.
  Make sure that all DTCs are cleared following rectification.
Make sure that all DTCs are cleared following rectification.

DTC index

:
  Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system).

DTC Description Possible causes Action
B1A0016 Control Module
  • Control module circuit voltage below threshold: Voltage less than (master control module voltage - 2V) for > 10 seconds
Check the battery condition and state of charge. Refer to the relevant section of the workshop manual. Check the module power and ground circuits. Refer to the electrical guides.
B1A0017 Control Module
  • Auxiliary heater control module circuit voltage above threshold
Check the battery condition and state of charge. Refer to the relevant section of the workshop manual. Check the module power and ground circuits. Refer to the electrical guides.
B1A0043 Control Module
  • Control module deactivated
  • Service requested by heater
  • Module in lock-out mode
Check for associated DTCs. Check for other faults which may cause the system to shut-down.
B1A0049 Control Module
  • Auxiliary heater control module internal electronic failure
Renew the auxiliary heater assembly. Refer to the warranty policy and procedures manual if a module is suspect.
B1D2211 Coolant Temperature Sensor
  • Internal control module sensor circuit short circuit to ground
Renew the auxiliary heater assembly. Refer to the warranty policy and procedures manual if a module is suspect.
B1D2215 Coolant Temperature Sensor
  • Internal control module sensor circuit short circuit to power
  • Sensor circuit high resistance
Renew the auxiliary heater assembly. Refer to the warranty policy and procedures manual if a module is suspect.
B1D2313 Overheat Sensor
  • Internal control module sensor circuit high resistance
Renew the auxiliary heater assembly. Refer to the warranty policy and procedures manual if a module is suspect.
B1D2411 Glow Plug
  • Internal control module glow plug circuit short circuit to ground
Renew the auxiliary heater assembly. Refer to the warranty policy and procedures manual if a module is suspect.
B1D2415 Glow Plug
  • Internal control module glow plug circuit short circuit to power
  • Glow plug circuit high resistance
Renew the auxiliary heater assembly. Refer to the warranty policy and procedures manual if a module is suspect.
B1D2511 Heater Fuel Pump
  • Pump circuit short circuit to ground
Check the auxiliary heater fuel pump and circuits. Refer to the electrical guides.
B1D2515 Heater Fuel Pump
  • Pump circuit short circuit to power
  • Pump circuit high resistance
Check the auxiliary heater fuel pump and circuits. Refer to the electrical guides.
B1D2611 Combustion Air Blower
  • Internal control module combustion air fan circuit short circuit to ground
Renew the auxiliary heater assembly. Refer to the warranty policy and procedures manual if a module is suspect.
B1D2615 Combustion Air Blower
  • Internal control module combustion air fan circuit short circuit to power
  • Combustion air fan circuit high resistance
Renew the auxiliary heater assembly. Refer to the warranty policy and procedures manual if a module is suspect.
B1D2692 Combustion Air Blower
  • Internal control module combustion air fan performance
  • Combustion air fan incorrect operation
Renew the auxiliary heater assembly. Refer to the warranty policy and procedures manual if a module is suspect.
B1D2693 Combustion Air Fan
  • Internal control module combustion air fan no operation
Renew the auxiliary heater assembly. Refer to the warranty policy and procedures manual if a module is suspect.
B1D2711 Heater Coolant Pump
  • Heater coolant pump circuit short circuit to ground
Check the FFBH water pump and circuits. Refer to the electrical guides.
B1D2715 Heater Coolant Pump
  • Heater coolant pump circuit short circuit to power
  • Heater coolant pump circuit high resistance
Check the FFBH water pump and circuits. Refer to the electrical guides.
B1D2993 No Start, Even After Restart Attempt
  • No flame detected, even after restart attempt
Check the fuel supply, Check the pump and circuits. Refer to the electrical guides.
B1D3093 No Start In Test Mode
  • No flame detected in test mode
Check the fuel supply, Check the pump and circuits. Refer to the electrical guides.
B1D3194 Flame Detected Prior to Normal Operation
  • Flame detected prior to normal operation
Check for fuel leakage, etc.
B1D3292 Multiple Flame Interruption During Heating Cycle
  • Heater interrupted more than a specified number of times in heating cycle
Check the system operation, check for restricted fuel lines, etc.
B1D3392 Flame Interruption During Normal Operation
  • Heater interrupted more than a specified number of times in operation
Check the system operation, check for restricted fuel lines, etc.
B1D3468 Heater In Lock Out Mode
  • Internal to module
Check for other DTCs and rectify first. Clear the DTCs and retest. if the DTC persists, renew the auxiliary heater assembly. Refer to the warranty policy and procedures manual if a module is suspect.
U007308 Control Module Communication Bus A Off
  • CAN circuit
  • Module fault
Check the CAN circuits. Refer to the electrical guides.
U016487 Lost Communication With HVAC Control Module
  • Auxiliary heater control module; missing message
  • BCM: Missing message
  • IPK: Missing message
Refer to the lost communication statement in the Network Communications section of the workshop manual.
U1A3787 Crash Status Telegram
  • Crash interlock active (internal to module)
Check the restraints control module for indications of a crash event. The heater is shut-down if this occurs. Clear the DTC and retest.
U1A0008 Private Bus Circuit
  • Signal/Message failure/error occurred in W-Bus communication
Refer to the Network Communications section of the workshop manual.
U1A0395 Car Config Parameter
  • Vehicle configuration mismatch
Configure the module using the approved diagnostic system.
U1A446C Fuel Level
  • Fuel level below threshold
Add fuel, clear DTC and recheck.
U300055 Control Module
  • Auxiliary heater control module not configured
Configure the module using the approved diagnostic system.