Jaguar XJ (X350). Manual — part 1207

accessed through the right-hand fender splash shield and the radiator splash shield.

The fuel fired booster heater operates at two levels. The system will only ever operate if the
engine is running. When the ambient temperature is below 8° C (46° F) and the coolant
temperature is lower than 76° C (169° F) the fuel fired booster heater operates at full power.

This stage will operate until the coolant temperature reaches 87° C (189° F), and it will then
switch to the second level and run at half power until the coolant temperature reaches 90° C
(194° F). At this point the system will switch off. It will switch on again at half power if the
coolant temperature drops below 79° C (174° F). If the coolant temperature drops to below
76° C (169° F), the system will operate at full power.

The fuel fired booster heater will not operate if:

•

the supply voltage is below 10.25V

•

it is in 'fault lockout'

Diagnosis and testing

Fuel Fired Booster Heater

Principles of Operation

For a detailed description of the fuel fired booster heater, refer to the relevant Description and

Operation sections in the workshop manual.

Fuel Fired Booster Heater

Inspection and Verification

1 . Verify the customer concern.

2 . Visually inspect for obvious signs of mechanical or electrical damage.

Mechanical

Electrical

•

Coolant Level

•

Fuel Level

•

Fuses/Relays

•

Damaged, Loose or Corroded Connector(s)

•

Damage to Wiring Loom/Incorrect Location, Stretched or Taught

3 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)

before proceeding to the next step.

4 . If the cause is not visually evident, verify the symptom and refer to the Jaguar Approved

Diagnostic System.

DTC Index

CAUTION: When probing connectors to take measurements in the course of the pinpoint

tests, use the adaptor kit, part number 3548-1358-00

NOTE:

If the control module/component is suspect and the vehicle remains under manufacturer

warranty, refer to the Warranty Policy and Procedures manual (section B1.2), or determine if

any prior approval program is in operation, prior to the installation of a new module.

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Generic scan tools may not read the codes listed, or may read only 5 digit codes. Match the five

digits from the scan tool to the first five digits of the seven digit code listed to identify the fault

(the last two digits give additional information read by the manufacturer approved diagnostic

system).

NOTE:

When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to

three decimal places and with a current calibration certificate. When testing resistance, always

take the resistance of the DMM leads into account.

NOTE:

Check and rectify basic faults before beginning diagnostic routines that involve pinpoint tests.

NOTE:

Inspect connectors for signs of water ingress, and pins for damage and/or corrosion.

NOTE:

If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an

intermittent concern may be the cause. Always check for loose connections and corroded

terminals.

DTC

Description

Possible Causes

Action

B1A0016 Control Module

•

Fuel fired booster heater
module - low supply
voltage

•

Generator voltage is
regulated by the engine
control module

Refer to electrical circuit

diagrams, notes and check fuel

fired booster heater module for

circuit voltage below threshold

(check power and ground circuit)

B1A0017 Control Module

•

Fuel fired booster heater
module - high supply
voltage

•

Generator voltage is
regulated by the engine
control module

Refer to electrical circuit

diagrams, notes and check fuel

fired booster heater module for

circuit voltage above threshold

(check power and ground circuit)

NOTE:

B1A0043 Control Module

•

Fuel fired booster heater
module - deactivated

Suspect the fuel fired heater

assembly, check and install a new

heater assembly as required,

refer to the new module

installation note at the top of the

DTC Index

B1A0049 Control Module

•

Fuel fired booster heater
module - internal circuit
electronic failure

Suspect the fuel fired heater

assembly, check and install a new

heater assembly as required,

refer to the new module

installation note at the top of the

DTC Index

B1D2211

Coolant

Temperature Sensor

•

Fuel fired booster heater
module - internal circuit
fault short to ground

Suspect the fuel fired heater

assembly, check and install a new

heater assembly as required,

refer to the new module

installation note at the top of the

DTC Index

B1D2215

Coolant

Temperature Sensor

•

Fuel fired booster heater
module, coolant
temperature sensor
circuit fault - short to
power or open circuit

Suspect the fuel fired heater

assembly, check and install a new

heater assembly as required,

refer to the new module

installation note at the top of the

DTC Index

B1D2313 Overheat Sensor

•

Fuel fired booster heater
module, overheat sensor
circuit - open circuit

Suspect the fuel fired heater

assembly, check and install a new

heater assembly as required,

refer to the new module

installation note at the top of the

DTC Index

B1D2411 Glow Plug

•

Fuel fired booster heater
module, glow plug circuit
- short to ground

Suspect the fuel fired heater

assembly, check and install a new

heater assembly as required,

refer to the new module

installation note at the top of the

DTC Index

B1D2415 Glow Plug

•

Fuel fired booster heater
module, glowplug circuit -

Suspect the fuel fired heater

assembly, check and install a new

heater assembly as required,

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