Cooling JAGUAR X308 1998 2.G Manual Online

4. Secure charge air cool
er inlet as
sembly to supercharger outlet
duct.
1. Install bolts.

5. Inst al
l coolant hoses and vacuum pipe to outlet duct.
1. Install vacuum pipe.
2. Install coolant hoses.
6. Refill cooling system; refer to (SC) (26.10.01).
7. Install intake tube / air fl ow meter / air cleaner cover
assembly; refer to 19.10.30.

is
of the 'hot-wire' type (the resistan
ce of the wire varies as incoming air passing over it has a cooling effect)
provides f
eedback to the ECM to perm
it monitoring of mass air flow
is NO
T serviceable, necessitating its renewal should a fault occur
Mass Air Flo
w (MAF) Sensor
Location

Is th
e voltage greater than 3 volts?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to B3
.
B3: CHECK
THE IAT SENSOR SENS
E CIRCUIT FOR SHORT TO GROUND
Turn the ignition swi
tch to the OFF
position.
1
Meas
ure the resistance between PI35, pin 03 (UP) and GROUND.
2
Is

the resistance less than 10,000 ohms?
Yes
REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No INSTALL a new MAF sensor.
REFER to Mass Air Flow (MAF) Sensor

in this section.
CLEAR the DTC. TEST the system for normal operation.
PI
NPOINT TEST C : DTC P0116, P0117, P0118
; ENGINE COOLANT TEMPERATURE (ECT) SENSOR
RANGE/PERFORMANCE, HIGH/LOW VOLTAGE
•
NOTE: Before commencing this
test, check the coolant level and condition, check the operation of the thermostat, rectify
as necessary.
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
C1: CHECK THE ECT SEN

SOR SENS
E CIRCUIT FOR HIGH RESISTANCE
Di
sconnect the battery negative terminal.
1
D

isconnect the ECM electrical connector, EM11.
2
D

isconnect the ECT sensor electrical connector, PI04.
3
Meas

ure the resistance between EM11, pin 09 (UY) and PI04, pin 02 (UY).
4
Is th

e resistance greater than 5 ohms?
Yes
REPAIR the high resistance circui t. For additional information, refer to the wiring diagrams. CLEAR
the DTC. TEST the system for normal operation.
No GO to C2
.
C2: CHECK THE ECT SEN
SOR SENSE CI
RCUIT FOR SHORT TO HIGH VOLTAGE
R
econnect the battery negative terminal.
1
Turn the ignition swi

tch to the ON
position.
2
Meas
ure the voltage between PI04, pin 02 (UY) and GROUND.
3
Is th

e voltage greater than 3 volts?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to C3
.
C3: CHECK THE ECT SEN
SOR SENSE CIRCUIT FOR SHORT TO GROUND
Turn the ignition swi

tch to the OFF
position.
1
Meas
ure the resistance between PI04, pin 02 (UY) and GROUND.
2
Is

the resistance less than 10,000 ohms?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No INSTALL a new ECT sensor. REFER to Section 303
-0
3A Engine Cooling
/
30
3
-0
3B Supercharger
Coo

ling
. CLEA
R the DTC. TEST the sy
stem for normal operation.
P
INPOINT TEST D : DTC P0121, P0122,
P0123; THROTTLE POSITION (TP) SENSOR
RANGE/PERFORMANCE, HIGH/LOW VOLTAGE
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
D1: CHECK

THE TP SENSOR SENS
E CIRCUIT FOR HIGH RESISTANCE
Di
sconnect the battery negative terminal.
1

AA1: CHECK THE RA
DIATOR FAN MODULE TO ECM
'SERIES' DRIVE CIRCUIT FOR HIGH RESISTANCE
Disc
onnect the battery negative terminal.
1
D
i
sconnect the ECM electrical connector, EM13.
2
Disc
onne
ct the fan module electrical connector, LS31.
3
Meas
ure t
he resistance between EM13, pin 15 (W) and LS31, pin 09 (W).
4
Is th
e res
istance greater than 5 ohms?
Yes REPAIR the high resistance circui t. For additional information, refer to the wiring diagrams. CLEAR
the DTC. TEST the system for normal operation.
No GO to AA2
.
AA2: CHECK THE RA
DIATOR FAN MODULE TO ECM 'SER
IES' DRIVE CIRCUIT FOR SHORT TO HIGH VOLTAGE
Re
connect the battery negative terminal.
1
Turn the ignition swit

ch to the
ON position.
2
Measure t
he voltage between EM13, pin 15 (W) and GROUND.
3
Is the volt

age greater than 3 volts?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to AA3
.
AA3: CHECK THE R A
DIATOR FAN MODULE TO ECM
'SERIES' DRIVE CIRCUIT FOR SHORT TO GROUND
Turn the ignition swit
ch to the
OFF position.
1
Meas ure t
he resistance between EM13, pin 15 (W) and GROUND.
2
Is
t
he resistance less than 10,000 ohms?
Yes
REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to AA4
.
AA4:
CHECK THE RADIATOR FAN MODULE IGNITION SUPPLY
Reconn

ect the ECM electrical connector, EM13.
1
Turn the ignition swit

ch to the
ON position.
2
Measure the voltage between LS 31,
pin 08 (WP) and GROUND.
3
Is the vol
t
age greater than 10 volts?
Yes INSTALL a new radiator fan module. REFER to Section 303
-03
A Engine Cooling
/
303-03B Supercharger Cooli
ng
. CLEA
R the DTC. TEST the sy stem f
or normal operation.
No REPAIR the circuit. This circui t includes the EMS fuse box, (f use 14), the EMS relay, etc. For
additional information, refer to the wiring diagrams. CLEAR the DT C. TEST the system for normal
operation.
PINPOINT TE ST
AB : DTC P1476; RADIATOR
FANS FAST (PARALLEL) CIRCUIT MALFUNCTION
TES
T
CONDITIONS
D E
TAILS/RESULTS/ACTIONS
AB1
:
CHECK THE RADIATOR FAN MODULE TO ECM
'PARALLEL' DRIVE CIRCUIT FOR HIGH RESISTANCE
Disc
onnect the battery negative terminal.
1
D
i
sconnect the ECM electrical connector, EM13.
2
Disc
onne
ct the fan module electrical connector, LS31.
3
Meas
ure t
he resistance between EM13, pin 16 (WU) and LS31, pin 07 (WU).
4
Is th
e res
istance greater than 5 ohms?
Yes REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the
DTC. TEST the system for normal operation.
No GO to AA2
.
AB2:
CHECK THE RADIATOR FAN MODULE TO ECM 'PARALLEL' DRIVE CIRCUIT FOR SHORT TO HIGH VOLTAGE
R
e
connect the battery negative terminal.
1
Turn the ignition swi
t
ch to the ON
position.
2
Measure t
he voltage between EM13, pin 16 (WU) and GROUND.
3

Is th
e voltage greater than 3 volts?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to AB3
.
AB3
: CHECK THE RADIATOR FAN MODULE TO ECM
'PARALLEL' DRIVE CIRCUIT FOR SHORT TO GROUND
Turn the ignition swi
tch to the OFF
position.
1
Meas
ure the resistance between EM13, pin 16 (WU) and GROUND.
2
Is

the resistance less than 10,000 ohms?
Yes
REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to AA4
.
AB4
: CHECK THE RADIATOR FAN MODULE IGNITION SUPPLY
Re

connect the ECM electrical connector, EM13.
1
Turn the ignition swi

tch to the ON
position.
2
Measure the
voltage between LS
31, pin 08 (WP) and GROUND.
3
Is the vol
tage greater than 10 volts?
Yes INSTALL a new radiator fan module. REFER to Section 303
-0
3A Engine Cooling
/
30
3
-03
B
Supercharger

Cooling
. CLEA
R the DTC. TEST the sy
stem for normal operation.
No REPAIR the circuit between LS31, pin 08 (WP) and battery. This circuit includes the EMS fuse box-
(fuse 14), the EMS relay, etc. For additional information, refer to the wiring diagrams. CLEAR the
DTC. TEST the system for normal operation.
P
INPOINT TEST AC : DTC P1516, P1517; GEAR
CHANGE PARK/NEUTRAL DRIVING MALFUNCTION
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
AC1: CH

ECK THE TRANSMISSION RANGE (TR) SE
NSOR TO ECM CIRCUIT FOR HIGH RESISTANCE
Di
sconnect the battery negative terminal.
1
Di

sconnect the TR sensor el
ectrical connector, EM47.
2
D
isconnect the ECM electrical connector, EM10.
3
Meas

ure the resistance between EM47, pin K (RU) and EM10, pin 15 (RU).
4
Is th

e resistance greater than 5 ohms?
Yes REPAIR the high resistance circui t. For additional information, refer to the wiring diagrams. CLEAR
the DTC. TEST the system for normal operation.
No GO to AC2
.
AC2: CH
ECK THE TRANSMISSION RANGE (TR)
SENSOR PARK/NEUTRAL SWITCHING ACTION
Meas
ure the resistance between pi
ns J and K of the TR sensor.
1
Mo
ve the selector lever from
PARK to NEUTRAL and back.
2
D
oes the resistance switch between open ci
rcuit and continuity as the lever moves?
Yes GO to AC3
.
No

INSTALL a new transmission range sensor. CLEAR th e DTC. TEST the system for normal operation.
AC3: CH
ECK THE D-4 SWITCH TO
TCM CIRCUIT FOR HIGH RESISTANCE
Di
sconnect the D-4 switch electrical connector, CC07.
1
Di

sconnect the TCM electrical connector, EM07.
2
Meas

ure the resistance between CC07,
pin 01 (US) and EM07, pin 13 (US).
3
Is th
e resistance greater than 5 ohms?
Yes REPAIR the high resistance circui t. For additional information, refer to the wiring diagrams. CLEAR
the DTC. TEST the system for normal operation.
No INSTALL a new transmission range sensor. CLEAR th e DTC. TEST the system for normal operation.
P
INPOINT TEST AD : DTC P1606;
EMS CONTROL RELAY MALFUNCTION

E
lectronic Engine Controls - Engine
Control Module (ECM) Adaptation
Gen
eral Procedures
When to car

ry out adaptations
DTCs P1000/P1111 Conditions for adaptation
Fuelling Adaptations Drive Cycle
•
NOTE: Make sure the engine is at normal operating
temperature. (75°C, 167°F) 1.
Whenever the battery is disconnected, the Engine Control
Module (ECM) adaptations are reset to a "green" ECM
condition. In this condition, certain functions of the ECM are
inhibited, and the ECM must "r elearn" these functions. To
enable the ECM to do this, the vehicle will have to perform
some maneuvres which it may, or may not, do during a normal
road test. The routine in this pr ocedure should be carried out at
Pre-Delivery Inspection, and after any emissions related
rectification work involving the disconnection of the battery.
2. When the DTCs relating to a rectified concern are cleared,
P1000 (system checks not complete since last memory clear)
will be flagged. This DTC does no t indicate a failure, just that
diagnostic drive cycles need to be performed. The vehicle's on-
board diagnostic system will confirm that all the diagnostic
drive cycles are complete by flagging P1111, (system checks
complete since last memory clear)
1. Make sure these conditions are checked and corrected, if
necessary, before carrying ou t the adaptation procedure.
MechanicalElectrical
Engi
ne oil level correct
Coo

lant level correct
F

uel level greater than
30%, less than 80%
F
uel filler cap correctly
fitted/secure, seal in good condition
Al
l rectification work
relating to DTCs completed
F
uel, ignition and cooling
systems in good order
Al
l Diagnostic Trouble
Codes (DTCs) cleared
Al
l rectification work
relating to DTCs completed
F
uses
Harnes

ses
E

lectrical connectors

1.
Either
the Jaguar approved diagnostic system (where
available), or a scan tool should be connected to measure the
Mass Air Flow rate. Most generi c scan tools should be capable
of reading this parameter.
Depending on road conditions and dealer location, it may be
difficult to achieve the road sp eeds necessary to reach the air
flow indicated. It is possible to reach these air flow figures by
inducing a load on the vehicle, (making use of hills, using a
lower gear ratio, etc) or, if no alternative is possible, by
restraining the vehicle and re aching the air flow figure
Si
te
Mass Air Flow
(gra
ms/second)
D
riving Conditions
1Up t

o 7 g/s
Idle
in
P for 2 minutes
21
0 to 14 g/s
O
pen throttle in
P for 2 minutes
31
8 to 22 g/s
O
pen throttle in
P or D with
guidance * for 2 minutes
42
5 to 30 g/s
D
rive with guidance * for 2
minutes

2.2. Check on non-volatile diagnostic memory by wr iting a test pattern and then reading it back.
3. 3. Internal 'watchdog' hardware to check whether the TCM has crashed.
Transmission Control Module Supply Voltage
The TCM monitors battery and igni tion switched supply voltages.
A permanent supply is used to maintain a battery backed 'memor y'. Should this supply be cut, due to battery disconnection
perhaps, the 'adaptive shift' valu es will be lost. This will result in a small reduction in shift quality for a period until th e
adaptions are 're-learned'
The TCM will adopt 'limp home' mode as a result of the supply voltage being >16V or <7V with an engine speed >1600
rpm.
Should the ignition supply be >7V but <9V the TCM will hold the gear that it has currently selected. If after 2.5 seconds,
with the engine speed >1600 rpm, the voltage remains at this level, 'limp home' mode will be adopted. The 2.5 second
delay is built in to prevent reaction to a momentary voltage fluctuation.
Operation
CAUTION: Disconnection of the TCM and / or the vehicle batt ery will cause system adaptions to be lost; this may be
apparent by shift quality degradation. Fo llowing reconnection, a period of 'varied' driving will reinstate adaptions and thus
normal operation. Please ensure that the customer is made aware that the adaption period is variable and may occur after
handover, as the transmission re-learns the prevailing driving style.
• NOTE: Should the TCM fail, please ensure that the control housing cooling fan is operating correctly. Failure of the cooling
fan MUST be rectified before renewing the TCM and details of a fan fa ilure should accompany the returned TCM.
The TCM processes information received in both analogue and digital form, such as:
Transmission input speed Transmission output speed Throttle position Pedal demand Gear selector position Engine torque Engine speed Transmission oil temperature Mode switch
This information is then used by the TC M to control shift energy management and decide which shift program to implement
and which gear to select.
The TCM uses the various sensors and inpu ts to monitor the correct operation of the system an d is programmed to take
default action and inform the operator when a fault occurs.
Safety Functions
The safety functions are designed to safeguard against inappr opriate actions by the operator as well as against system
malfunctions. The system prevents reve rse gear from being engaged at high forward speeds and prevents manual
downshifting at excessive engine speeds; these functions are not operational in mechanical limp-home mode.
The TCM constantly monitors the transmissi on for faults. In the event of a problem the TCM will adopt a 'limp home' mode
in which only P R N D - (selector in D but only fourth gear is enabled) are available. The operator will be made aware of
certain faults by an in strument panel warning.
The electrical and diagnostic system has been designed such that system integrity is protected at all times, the safety
concept being based on th e following three points:

3.3. Gradient: Under specific speeds and loads
4. 4. Cruise: During cruise control
5. 5. Manual: Shift map when the LH side of the 'J gate' is used
Three specific condition shift maps have a higher priority than the two base shift maps and will intervene when appropriate
conditions prevail for traction, gradient or cruise.
When traction control (engine or brake system derived) is operational the TCM will implement the traction map to maximise
control of wheel slip.
The gradient maps are intended to enhance vehicle drivability when towing or climbing a gradient. The TCM will implement
the maps when increased driving resistan ce is detected and enhanced drivability, cooling and increa sed performance is
appropriate.
The cruise map is intended to minimize unwanted gearshifts and 'hunting' and is activated when cruising near to the set
speed, or resuming.
Connector Pins Identification
Connector Pin Identity Chart for EM007

Pin NumberCircuit Function
001Pressure regulator 2
002Mode switch status
003Not used
004Pressure regulator #4
005Pressure regulator #1
006Power ground
007Not used
008Rotary switch L2
009Rotary switch L4
010 to 011Not used
012Mode switch Pin B (Sport)
013D to 4 switch
014Input speed sensor (-)
015Output speed sensor (screen)
016Output speed sensor (+)
017Not used
018Kickdown switch (where used)
019 to 020Not used
021Analogue ground
022Fluid temperature sensor
023Input speed sensor (screen)
024 to 025Not used
026B+
027Not used
028Digital ground
029Pressure regulator #3

Range Selection
The 'J' gate selector lever is connected to the transmission via a cable which operates the transmission selector shaft
between positions P R N D only. The shift lever disconnects from the cable when the lever is moved across the gate from D
to 4 .
Movement of the lever between P R N D manu ally controls the flow of transmission fluid, the TCM having control of the
forward gear selected in D .
Movement of the lever to 4 , 3 and 2 positions does not manu ally modify the fluid flow, the TCM detects these positions
using the DLS and controls the ratios electronically by energizing solenoids.
Shift Point Control
The gearshift points are controlled by the TCM, as a function of the output speed, engine load, engine speed, selector
position and shift program selected. The operator has control over the shift points via the shift lever, throttle pedal
movement, kickdown function and mode switch.
Mode Switch
This switch allows operator selection of two base shift modes; Normal and Sport; th e switch being illuminated when Sport is
selected. This function alters the values in the TCM shift point calculations.
Shift Programs
Upon encountering the following conditions, the TCM will auto matically modify the Normal or Sports shift map to enhance
the operation of the vehicle:
1. 1. Traction: When traction intervention is active.
2. 2. Hot mode: Extreme engine/transmission temperatures.
3. 3. Gradient: Under specific speeds and loads.
4. 4. Manual: Driver initiated override of the normal shif t map when the LH side of the 'J gate' is used.
Traction
When traction or stability control (engine or brake system de rived) is operational the TCM will implement the traction map
to maximize control of wheel slip.
Gradient
The gradient function is intended to enhance vehicle drivea bility when climbing a gradient or towing. The TCM will
implement the function when increased driving resistance is de tected, and provides enhanced driveability, additional cooling

Transmission/Transaxle Cooling - 4.0L NA V8 - AJ27/3.2L NA V8 - AJ26 -
Transmission Cooling
Description and Operation
The transmission fluid cooling system maintains fluid temperature within specified limits.

Parts List
Component Descriptions
The transmission fluid pipes:
Transfer fluid from the transmission to the cooler under the action of the hydraulic system pump. Return the cooled fluid from th e cooler to the transmission.
The transmission fluid cooler:
Is a plate type made from aluminum. Is mounted in the engi ne cooling radiator right-hand end tank.
Overheating Protection
If the engine coolant or transm ission fluid temperatures exceed their predefined limits, th e transmission control module locks
the torque converter clutch. By reducing slip, this minimises th e amount of heat transferred to the engine cooling system from
the transmission fluid.

ItemPart NumberDescription
1—Fluid pipe, oil FROM cooler
2—Fluid pipe, oil TO cooler