engine overheat JAGUAR XFR 2010 1.G Workshop Manual

Published: 17-Apr-2014
Engine Cooling - V8 5.0L Petrol/V8 S/C 5.0L Petrol - Engine Cooling V8 5.0L
Petrol/V8 S/C 5.0L Petrol
Diagnosis and Testing

Principle of Operation

For a detailed description of the engine cooling system and operation, refer to the relevant description and operation section of
the workshop manual. Engine Cooling, Section - 303-03

Inspection and Verification


WARNING: Moving parts can cause severe injury, keep clear of moving parts, never place your hands or any part of your
body near to moving parts


CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not
guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle
NOTES:


Check DDW for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific
customer complaint and carry out the recommendations as required.


If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the
Warranty Policy and Procedures manual, or determine if any prior approval programme is in operation, prior to the installation
of a new module/component.


Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests

1. Verify the customer concern

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

Visual Inspection
Mechanical Electrical
Coolant leaks
Coolant hoses
Coolant expansion tank
Radiator
Heater core
Accessory drive belt
Cooling fan
Fuses
Harnesses
Loose or corroded connector(s)
Engine coolant temperature sensor
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 symptom chart, alternatively check for
diagnostic trouble codes (DTCs) and refer to the DTC Index
Symptom Chart

Symptom Possible Causes Action Coolant loss
Hoses
Hose connections
Radiator
Water pump
Heater core
Gaskets
Engine casting cracks
Engine block core
plugs Carry out a visual inspection. If there are no obvious leaks, carry out a
cooling system pressure test. Rectify any leaks as necessary Overheating
Low/contaminated
coolant
Thermostat
Cooling fan Check the coolant level and condition. Carry out a cooling system pressure
test. Rectify any leaks as necessary. Check the thermostat and rectify as
necessary. Check the cooling fan operation, make sure the cooling fan
rotates freely. Check for obstructions to the air flow over the radiator.
Rectify as necessary

GENERAL System Operation

The ignition coils are supplied with electrical power from the battery via a 250 A megafuse in the BJB (battery junction box)
and the ignition relay in the EJB (engine junction box). The control signal for the ignition relay is supplied by the CJB (central
junction box).

The ECM (engine control module) sends a separate signal to each ignition coil to trigger the power stage switching. The ECM calculates the dwell time from the battery voltage and engine speed, to ensure a constant energy level is produced in the
secondary coil each time the power stage is switched. This ensures sufficient spark energy is available without excessive
primary current flow, which avoids overheating and damage to the ignition coils.
The ECM calculates the ignition timing for individual cylinders from: Engine speed
Camshaft position
Engine load
Engine temperature
The knock control function
The shift control function
The idle speed control function.



IGNITION COILS Component Description



The ignition coils are installed in the cylinder head covers, under the NVH (noise, vibration and harshness) covers. Each
ignition coil locates on a spark plug and is secured to the related cylinder head cover with a single screw. Each ignition coil
incorporates a three pin electrical connector for connection to the engine harness.

Each ignition coil contains a primary and a secondary winding. The primary winding receives electrical power from the ignition
relay in the power distribution box. A power stage in the primary winding allows the ECM to interrupt the power supply, to induce a voltage in the secondary winding and thus the spark plug. A diode in the ground side of the secondary winding
reduces any undesirable switch-on voltage, to prevent misfiring into the intake manifold. The power stage limits the maximum
voltage and current in the primary winding, to protect the power stage and limit the voltage in the secondary winding. www.JagDocs.com

Message Other Warnings Reason Action in LCD. system and the tire pressures
cannot be monitored. ENGINE TEMPERATURE
HIGH Amber warning triangle
illuminated in LCD at temperatures of between
118.0°C (244.4°F) and
119.3°C (246.8°F). Engine coolant temperature has
exceeded threshold for normal
operation.
Stop vehicle and allow engine
to idle for 5 minutes. Switch off
engine and allow to stand for
not less than 10 minutes. Check
coolant level.
If message re-appears,
investigate coolant system for
leakage. ENGINE
OVERHEATING Red warning triangle
illuminated in LCD at temperatures of 119.4°C
(247°F) or above. Engine coolant temperature has
exceeded threshold for normal engine
operation.
Stop vehicle and allow engine
to idle for 5 minutes. Switch off
engine and allow to stand for
not less than 10 minutes. Check
coolant level.
If message re-appears,
investigate coolant system for
leakage. ENGINE OIL
PRESSURE LOW Red warning triangle
illuminated in LCD. Engine oil pressure has fallen below the
threshold for normal operation. Stop the engine immediately. Check
engine oil level. If oil level correct, do
not restart engine until oil pressure
loss has been identified and corrected. RESTRICTED
PERFORMANCE Red or Amber warning
triangle illuminated in LCD depending on nature of power loss. A fault has occurred which has reduced
engine power output. Investigate cause of engine power
loss. Interrogate control modules for
faults and diagnose using an approved Jaguar Diagnostic System. ENGINE SYSTEMS
FAULT
MIL (malfunction
indicator lamp)
illuminated for
certain faults.
Red or Amber
warning triangle
illuminated in LCD.
A fault has occurred in the
engine management system or, if
the MIL is illuminated, an emissions related fault is present
which has been detected by
the On-Board Diagnostic
systems in the ECM and TCM. A fault has occurred with the
start/stop switch.
Investigate cause of fault.
Interrogate ECM and TCM for faults and diagnose using an
approved Jaguar Diagnostic
System.
Check start/stop switch for
correct operation or short
circuits. CHECK FUEL
FILLER CAP
(NAS Vehicles Only)
Red warning triangle
illuminated in LCD. The Diagnostic Monitoring Tank Leakage
(DMTL) system has detected fuel filler
cap has not been correctly installed or
the system has a leak. Check fuel filler cap to ensure is it is
correctly installed and secure or check
the fuel system for leakage. ENGINE TEMPERATURE
INDICATION
FAULT Red warning triangle
illuminated LCD. A fault has occurred in the engine
management system and the engine
temperature signal is no longer being
received. Investigate cause of engine
temperature failure. Interrogate ECM for faults and diagnose using an approved Jaguar Diagnostic System. PLEASE WAIT
COLD START IN
PROGRESS Amber warning triangle
illuminated LCD. Message appears after start/stop switch
is pressed. Glow plugs are warming up,
message will appear for up to 12
seconds dependant on ambient
temperature. Engine will crank once message is switched off. None GEARBOX FAULT
Battery symbol and amber
warning triangle illuminated
in LCD. TCM has detected a fault in the Investigate transmission fault. transmission. Transmission may default
to 'limp home' mode and only allow
limited operation of forward gears and
reverse. Interrogate TCM and diagnose fault using an approved Jaguar Diagnostic
System. BATTERY NOT
CHARGING Red warning triangle
illuminated in LCD. Charge output from generator not
detected by ECM. Investigate cause of generator failure. OVER 120 km/h
(GULF States Only)
Red text illuminated
in LCD. Vehicle has exceeded the preset 120
km/h speed value. Reduce vehicle speed. DPF FULL SEE
HANDBOOK Amber or Red warning
triangle illuminated LCD. ECM has detected diesel particulate Drive the vehicle as described in the filter is becoming blocked or has become
blocked. owners handbook or the workshop
manual to clean the filter. COOLANT LEVEL
LOW Red warning triangle
illuminated in LCD. Coolant level in expansion tank has
fallen below minimum level.
Stop vehicle and allow engine
to idle for 5 minutes. Switch off
engine and allow to stand for
not less than 10 minutes. Check
coolant level and replenish

STEERING
COLUMN LOCKED Red warning triangle
illuminated in LCD. Fault has occurred preventing the
steering column lock from unlocking. This will also prevent the engine from
starting. Press the stop/start button to return to
accessory mode 4. If steering column
is still locked, investigate cause of
fault and interrogate the CJB (central junction box) for faults and diagnose
using an approved Jaguar Diagnostic System. IGNITION ON
Red warning triangle
illuminated in LCD. Stop/start button has been pressed
without the brake pedal depressed. Ignition is now in power mode 6. None ENGINE STOP
BUTTON PRESSED Red warning triangle
illuminated in LCD. Engine stop button has been pressed
when the vehicle is moving. Engine will
not be switched off until button is pressed quickly for a second time. Do not stop engine when vehicle is
moving unless necessary. LIGHTS ON
Amber warning triangle
illuminated in LCD. Side lamps or headlamps are on and the
driver's door has been opened. Switch off headlamps to avoid
excessive drain on battery. AUTOLAMP
DELAY OFF None
Autolamp delay feature has been
deactivated by moving light control
switch from the auto position. None AUTOLAMP
DELAY XX:XX None
Lighting control switch has been moved
to one of the 4 autolamp delay
positions. Message displays delay timer period selected. None AUTOLAMP
DELAY None
Autolamp delay is selected on the light
control switch and the driver has
switched off ignition and opened driver's
door initiating the autolamp delay. None. Message will extinguish once the
selected delay timer has switched off
the headlamps. TAIL LAMP
FAILURE None The tail lamp LED (light emitting
diode)'s are not functioning correctly.
Location shown on vehicle image. Correct fault in rear lamp assembly,
RJB (rear junction box) or wiring. BRAKE LAMP
FAILURE None The brake lamp LED's are not functioning correctly. Location shown on displayed vehicle image. Correct fault in rear lamp assembly,
RJB or wiring. INDICATOR LAMP
FAILURE None
A turn signal indicator bulb has failed.
Location is shown on displayed vehicle image. Replace failed turn signal indicator
bulb. E-DIFF NOT
AVAILABLE Amber warning triangle
illuminated in LCD accompanied with a single
chime Differential temperature has reached the
overheat threshold. System deactivated
until temperature returns within limits. Allow differential to cool. E-DIFF FAULT
Amber warning triangle
illuminated in LCD accompanied with a single
chime Fault has occurred with electronic
differential. System deactivated until
fault rectified. Investigate cause of fault and
interrogate the system for faults and
diagnose using an approved Jaguar Diagnostic System. ENGINE OIL LOW
Amber warning triangle
illuminated in LCD accompanied with a single
chime The oil is at the minimum level for safe
operation. Top-up with 1 liter (1.8 pints) of oil. ENGINE OIL
HIGH Amber warning triangle
illuminated in LCD accompanied with a single
chime This warning is displayed when the
engine is started, if the oil is above the
maximum level for safe operation. Stop the vehicle as soon as safety
permits and have the engine oil
drained to correct level, before driving
the vehicle. ENGINE OIL
CRITICALLY LOW Red warning triangle
illuminated LCD accompanied with a single
chime The oil is below the minimum level for
safe operation. Stop the vehicle as soon as safety
permits and top-up with 1.5 liters (2.6
pints) of oil. Wait for 10 minutes,
re-check the oil level reading and top-up again if necessary. ENGINE OIL
LEVEL MONITOR
SYSTEM FAULT Amber warning triangle
illuminated in LCD accompanied with a single
chime A fault with the oil level monitoring
system is indicated. Investigate cause of fault and
interrogate the ECM for faults and diagnose using an approved Jaguar Diagnostic System. WATER IN FUEL
Amber warning triangle
illuminated in LCD accompanied with a single
chime The water in fuel sensor in the fuel filter
has detected water in the fuel system. Drain fuel filter to remove collected
water. Odometer Display

The odometer displays the total distance which the vehicle has traveled. This is calculated by the instrument cluster using
wheel speed signals from the ABS module.
The odometer can show 6 characters and distances up to 999,999 miles or kilometers. The total distance travelled is stored in a
EEPROM (electrically erasable programmable read only memory) and the RAM (random access memory). This ensures that the
total distance is not lost if the battery is disconnected.

The odometer value is passed to other vehicle system modules on the medium speed and high speed CAN bus. This is used to record the total vehicle mileage for diagnostic purposes and when storing DTC (diagnostic trouble code)'s.