Auxiliary Heating: Other Jaguar X-type I

Electric Booster Heater

Due to the high-efficiency of the diesel engine, there is insufficient waste-heat available to the heater core. An auxiliary electrical booster heater is installed as standard. When the specified operating conditions are met, the heater is activated to raise the temperature of the coolant before it enters the heater core.

The heater is located at the lower left-hand side of the bulkhead and is integral to the cooling system.

The heater comprimises of an aluminum housing into which three glow-plug elements are located. Each element has a heating capability of 300 Watts.

Scheme 55

The powertrain control module (PCM) determines which (if any) of the elements within the auxiliary heater are activated depending on the following

1. cylinder head temperature (CHT)
2. air charge temperature (ACT)
3. load condition of the generator

The auxiliary heater will

1. not activate should the ACT be greater than 5°C
2. only be activated when the CHT is below 75°C and the ACT is below 5°C
3. be de-activated should the CHT rise above 75°C
4. not activate if the generator saturation is above 90%

Scheme 56

Provided the temperature conditions are satisfied and depending on the load condition of the generator, the PCM will cause one of the following to occur

1. activation of relay 1
2. activation of relay 2
3. activation of both relays
4. no activation of either relay

The PCM software includes a calibrated map, which is used in conjunction with generator load to define the heater switching-points relative to actual generator speed.

At all times during heater operation, the system is designed to allow as manyglow-plug elements as possible to be activated, without causing the generator to become saturated.

Fuel Fired Booster Heater

For markets that experience extremely low temperatures, a fuel fired booster heater is installed in place of the electrical booster heater.

The fuel fired booster heater only operates when the engine is running. The fuel fired booster heater is located at the lower left-hand side of the bulkhead and is integral to the cooling system.

The fuel fired booster heater provides the following

1. automatic operation
2. quickly boosts the engine up to it's optimum operating temperature range
3. reduces engine wear by keeping the engine at its optimum operating temperature
4. helps to create a warm and comfortable vehicle interior
5. provides greater heat levels for quicker defrosting of glass
6. compact design and engine compartment mounting.

Fuel Fired Booster Heater System

The system consists of a fuel fired booster heater unit and fuel pump.

The fuel fired booster heater takes its coolant feed from the engine exhaust gas recirculation (EGR) system.

The fuel fired booster heater fuel pump is located above the heater and connected to the engine fuel-return line. The pump delivers metered quantities of fuel into the combustion chamber. A pressure-regulating valve is installed between the fuel intake and the pump to reduce the fuel pressure down to below 0.2 bar.

The fuel fired booster heater incorporates an electronic control module, this unit controls the operation of the fuel fired booster heater.

Scheme 57

Scheme 58

Combustion Air Fan

The combustion air fan uses a permanent magnet motor with a fan wheel, which is driven by a pulse width modulated (PWM) voltage supply.

The combustion air fan delivers and regulates the flow of air into the fuel fired booster heater to support combustion of the fuel supplied by the fuel fired booster heater fuel pump. The combustion air fan is also used to purge and cool the fuel fired booster heater unit. A canister type muffler in the air inlet supply line is used to reduce operating noise.

Burner Housing

The burner housing incorporates the burner insert connections for the coolant ports and exhaust pipe. Exhaust gases are directed to atmosphere through a pipe and muffler.

Burner Insert

The burner insert incorporates the fuel combustion chamber, heat exchanger, evaporator and combined glow plug and flame sensor. Fuel from the fuel fired booster heater pump is supplied to a venturi, where it enters the combustion chamber to mix with air from the combustion air fan.

When commanded by the fuel fired booster heater electronic control module the glow plug supplies a temperature of approximately 1500 °C to provide the ignition source for the fuel/air mixture. The fuel fired booster heater electronic control module establishes combustion by monitoring the flame sensor. It measures the heat from the flame by converting the resistance value of the glow plug into a voltage signal.

Heat Exchanger

The heat exchanger transfers the heat generated by the combustion process into the vehicles coolant.

Two sensors located in the heat exchanger provide the fuel fired booster heater electronic control module with temperature values for the heat exchanger's casing temperature and coolant temperature.

The values from the sensors are used for fuel fired booster heater system adaptation between full-load, part-load and stand-by.

Electronic Control Module

The electronic control module controls and monitors the combustion operation. The module is ventilated by a hose routed from the air storage compartment of the burner.

Temperature Sensor

The temperature sensor located in the heat exchanger provides an electrical resistance signal to the electronic control module to indicate the coolant temperature status.

Overheat Protection

Overheat protection is controlled by a temperature resistor located in the heat exchanger. This protects against excessive operating temperatures. Overheat protection responds at a coolant temperature in excess of 125 °C and switches the fuel fired booster heater from ' stand-by ' to ' OFF '.

Fuel Pump

The fuel fired booster heater electronic control module outputs a PWM voltage signal to activate the pump. When the pump is de-energized it provides a positive shut-off of the fuel supply.

Switch On / Starting

During engine startup the fuel fired booster heater goes into stand-by. If the coolant circuit temperature is below 87 °C and the ambient temperature is below 5 °C the fuel fired booster heater starting sequence commences.

The glow plug is activated and after a delay the fuel pump commences operation and the fuel is ignited.

The combustion air fan operation is then initiated. The combustion air fan speed is increased in two ramps to nearly full-load operation. After a stabilization phase the combustion air fan speed is again increased to full-load and the glow plug is deactivated.

After these events have been completed the fuel fired booster heater enters Automatic Heating Operation.

Pinpoint Tests

Note. This section contains references to Parameter Identifiers (PIDs). Where the Jaguar approved diagnostic system is not available, a scantool may be used to access these PIDs, all of which give information, and some of which can be used to both read information and to activate components. The format of the information may vary, depending on the tool used.

Note. When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to 3 decimal places, and with an up-to-date 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 involving pinpoint tests.

Note. If a DTC is detected, all DTCs must be cleared after the concern is repaired. Failure to clear all DTCs may cause driveability concerns.

G457389t1: CHECK THE AUXILIARY HEATER RELAY CIRCUIT FOR SHORT CIRCUIT TO POWER

G457389t3: CHECK THE AUXILIARY HEATER 1 CIRCUIT CONTINUITY

G457389t4: CHECK THE AUXILIARY HEATER CONTROL CIRCUIT FOR SHORT CIRCUIT TO GROUND

G457389t6: CHECK THE AUXILIARY HEATER 1 CONTROL LINE 'ON' STATE

G457389t7: CHECK THE AUXILIARY HEATER 1 CONTROL LINE FOR SHORT TO GROUND

G457389t8: CHECK THE ECM CONTROL LINE 'ON' STATE

G457389t9: CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO POWER

G457389t10: CHECK THE AUXILIARY HEATER 1 CONTROL LINE 'OFF' STATE

G457389t11: ELIMINATE THE ECM FROM THE POSSIBLE CAUSES

G457389t12: CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO GROUND

G457389t14: CHECK THE ECM CONTROL LINE FOR CONTINUITY

G457389t15: CHECK THE AUXILIARY HEATER 2 CONTROL LINE 'ON' STATE

G457389t16: CHECK THE AUXILIARY HEATER 2 CONTROL LINE FOR SHORT CIRCUIT TO GROUND

G457389t17: CHECK THE AUXILIARY HEATER 2 CONTROL LINE FOR CONTINUITY

G457389t18: CHECK THE SUPPLIES TO THE AUXILIARY HEATER 2 RELAY

G457389t19: CHECK THE ECM CONTROL LINE 'ON' STATE

G457389t20: CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO POWER

G457389t21: CHECK THE AUXILIARY HEATER 2 CONTROL LINE 'OFF' STATE

G457389t23: CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO GROUND

G457389t26: CHECK THE ECM CONTROL LINE FOR CONTINUITY

G457389t27: CHECK THE AUXILIARY HEATER CIRCUITS FOR SHORT CIRCUIT TO POWER

G457389t29: CHECK THE AUXILIARY HEATER CIRCUIT CONTINUITY

G457389t30: CHECK THE AUXILIARY HEATER CIRCUIT FOR SHORT CIRCUIT TO GROUND

G457389t32: CHECK THE AUXILIARY HEATER CONTROL LINE 'ON' STATE

G457389t33: CHECK THE AUXILIARY HEATER CONTROL LINE FOR SHORT CIRCUIT TO GROUND

G457389t34: CHECK THE AUXILIARY HEATER CONTROL LINE FOR CONTINUITY

G457389t35: CHECK THE SUPPLIES TO THE AUXILIARY HEATER RELAY

G457389t36: CHECK THE ECM CONTROL LINE 'ON' STATE

G457389t37: CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO POWER

G457389t38: CHECK THE AUXILIARY HEATER CONTROL LINE 'OFF' STATE

G457389t40: CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO GROUND

G457389t43: CHECK THE ECM CONTROL LINE FOR CONTINUITY

Note. This section contains references to Parameter Identifiers (PIDs). Where the Jaguar approved diagnostic system is not available, a scantool may be used to access these PIDs, all of which give information, and some of which can be used to both read information and to activate components. The format of the information may vary, depending on the tool used.

Note. When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to 3 decimal places, and with an up-to-date 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 involving pinpoint tests.

Note. If a DTC is detected, all DTCs must be cleared after the concern is repaired. Failure to clear all DTCs may cause driveability concerns.

G455141t1: CHECK THE FUEL FIRED HEATER CONTROL RELAY SUPPLY

G455141t2: CHECK THE CONTROL LINE FOR SHORT CIRCUIT TO GROUND

G455141t4: CHECK THE CONTROL LINE FOR SHORT CIRCUIT TO POWER

G455141t6: CHECK THE FUEL FIRED HEATER MODULE SIGNAL LINE FOR SHORT CIRCUIT TO GROUND

G455141t8: CHECK THE FUEL FIRED HEATER MODULE SIGNAL LINE FOR SHORT CIRCUIT TO POWER

G455141t10: CHECK THE FUEL FIRED HEATER SIGNAL LINE FOR OPEN CIRCUIT

G455141t11: CHECK THE POWER TO THE FUEL FIRED HEATER MODULE

G455141t12: CHECK THE IGNITION SUPPLY TO THE FUEL FIRED HEATER MODULE

G455141t13: CHECK THE FUEL FIRED HEATER MODULE GROUND CIRCUIT

G455141t14: CHECK THE CONTROL LINE FOR CONTINUITY

Scheme 59

Scheme 60

Scheme 61

1. Remove the air deflector. For additional information, refer to AIR DEFLECTOR - 2.2L DIESEL/2.0L DIESEL ( )
2. Detach the wiring harness.
3. Detach the coolant hose.
4. Disconnect the coolant hoses.
5. Remove the electric booster heater. Detach the wiring harness.

Scheme 62

Scheme 63

1. To install, reverse the removal procedure. Tighten to 10 N.m.
2. Tighten to 4 N.m.
3. Check and top up the coolant if necessary.

Scheme 64

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Scheme 67

Scheme 68

1. Remove the air deflector. For additional information, refer to AIR DEFLECTOR - 2.2L DIESEL/2.0L DIESEL ( )
2. Disconnect the fuel fired booster heater electrical connector.
3. Disconnect the fuel fired booster heater fuel line.
4. Detach the coolant hose.
5. Disconnect the coolant hose.
6. Disconnect the coolant hose.
7. Remove the retaining bolts.
8. Remove the fuel fired booster heater. Remove the retaining bolts.

Scheme 69

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Scheme 74

Scheme 75

1. Install the fuel fired booster heater. Install the retaining bolts.
2. Install the retaining bolts.
3. Connect the coolant hose. Remove the hose clamp.
4. Connect the coolant hose. Remove the hose clamp.
5. Attach the coolant hose.
6. Connect the fuel fired booster heater fuel line.
7. Connect the fuel fired booster heater electrical connector.
8. Install the air deflector. For additional information, refer to AIR DEFLECTOR - 2.2L DIESEL/2.0L DIESEL ( )
9. Check and top up the coolant if necessary.