1994 JAGUAR XJ6 air conditioning

Climate Control Systems
14.10 FAULT DIAGNOSIS
14.10.1 Introduction
It is very important to positively identifythe area of concern before starting a rectification procedure. A little time spent
with your customer to identify the conditions under which a problem occurs will be beneficial. Relevant criteria are:
Weather conditions, ambient temperature, intermittent or continuous fault, airflow fault, temperature control fault, dis
- tribution fault and air inlet problem.
14.10.2 Functional Check
This simple 'first line check' will allow you to ascertain whether the system is operating within its design parameters,
without recourse to (JDE). Please carry out the following, in order.
0 Start engine and attain normal running temperature.
0 Presss AUTO to display selected temperature and illuminate AUTO & AJC state lamps.
0 Rotate FAN to increase or decrease lower speed, verify bar graph representation.
0 Operate AJC to toggle on or off. Because the compressor can be inhibited by the engine management system,
ensure that the engine temperature is normal and that the ambient is above 5O C.
0 Operate RECIRC, state lamp should be lit and the flap behind the blower grille open.
0 Operate distribution buttons in turn, verify correct air distribution and relevant state lamp.
0 Operate DEFROST, check max fans and air to front screen.
0 Cycle TEMPERATURE to 'Hi' and 'Lo' to verify demanded variations and display operation. Note that extremes
will provide max heat or cold independent of in-car temperature.
0 Operate EX to toggle between ambient and control temperatures.
0 Operate HFS and HRW to note timer and mirror operation.
0 Initiate System Self Test to check for, and extract, stored faults should any of the above not perform as stated.
14.10.3 System symptoms
There are five basic symptoms associated with air conditioning fault diagnosis. The following conditions are not in order of priority.
No Cooling
0 Is the electrical circuit to the compressor clutch functional?
0 Is the electrical circuit to the blower motor(s) functional?
0 Slack or broken compressor drive belt.
0 Compressor partially or completely seized.
0 Compressor shaft seal leak.
0 Compressor valve or piston damage (may be indicated by small variation between HIGH &LOW side pressures
relative to engine speed).
0 Broken refrigerant pipe (causing total loss of refrigerant).
0 Leak in system (causing total loss of refrigerant) - possible code 23.
0 Blocked filter in the receiver drier.
0 Evaporator sensor disconnected - possible code 13.
0 Pressure switch faulty - possible code 23.
X300 VSM Issue 1 August 1994

Climate Control Systems
14.13 SYSTEM CHECKING WITH MANIFOLD GAUGE Sm
14.13.1 Evacuating the Manifold Gauge Set
Attach the centre (service) hose to a vacuum pump and start the pump. Open fully both high anddow valves and allow
the vacuum to remove air and moisture from the manifold set for at least five minutes.
Turn the vacuum pump off and isolate it from the centre service hose but do not open the hose to atmosphere.
CAUTION: It is imperative that the vacuum pump is not subjected to a positive pressure of any degree. Therefore
the pump must be frtted with an isolation valve at the centre (service hose) connection and this valve
must be closed before the pump is switched off. This operation replaces the 'purge' procedure used on
previous systems. Observe the manufacturefs recommendation with regard to vacuum pump oil
changes.
14.13.2 Connecting the Manifold Gauge Set
CAUTION: Only use hoses with connectors which are dedicated to HFC 134A charge ports.
Attachment of the hose quick release connectors to the high and low side system ports is straightfotward, provided
that the high and low valves are closed and the system is NOT operational.
Assessment of system operating efficiency and fault classification may be achieved by using the facilities on your
Re- covery / Recharging / Recycling station, follow the manufacturers instructions implicitly and observe all safety con- siderations.
WARNING: UNDER NO CIRCUMSTANCES SHOULD THE CONNECTIONS BE MADE WITH THE SYSTEM IN
OPERATION OR THE VALVES OPEN. SHOULD THE VALVES BE OPEN AND A VACUUM PUMP OR
REFRIGERANT CONTAINER ATTACHED, AN EXPLOSION COULD OCCUR AS A RESULT OF HIGH
PRESSURE REFRIGERANT BEING FORCED BACK INTO THE VACUUM PUMP
OR CONTAINER.
14.13.3 Stabilizing the System
Accurate test gauge data will only be attained if the system temperatures and pressures are stabilized.
Ensure that equipment and hoses cannot come into contact with engine moving parts or sources of heat.
It is recommended that a free standing air mover is placed in front of the vehicle to provide air flow through the con- denser / cooling system, see illustration below.
Start the engine, allow
it to attain normal working temperature and set at fast idle (typically 1200 to 1500 rpm). Select full air conditioning performance.
With all temperatures and pressures stable, or displaying symptoms of faults; begin relevant test procedures.
Fig.
1
Issue 1 August 1994 20 X300 VSM

SERVKE TOOLS & EQU1PMENT
Illustration I JagusrNumbw I Description I NOtOS
Instrument pack to support panel
to
be issued
11. TORQUE TlGHTENlNG SPEC1FKATIONS
1.8
Fixing
Fascia to console
Fascia to support bracket
(Nm)
I TigM.ningToqrn
I
2.5-3.5
22-28
Instrument pack to fascia
Strut to fascia 2.5-3.5
1.5-2.5
I I 22-28 1 Tunnel bracket to bodv
I Bolster to tunnel bracket I 1.5 I
Fascia support strut to BIW 7-1 0
CPU brackets to fascia 5-7
Fascia demister bracket to fascia 1.5
Fascia and air conditioning location to body 1
Air distribution box duct to air distribution box
Airbag carrier mounting bracket to fascia 1
5-7
instrument pack support bracket to fascia
Airbag bracket to fascia 5-7
1.5-2.5
Air distribution box to fascia
Airbag upper bracket to carrier 1.5-2.5
1.5-2.5
Instrument pack support bracket and strut
Fascia assembly to BIW 5-7
22-28
111. SERVKE MTERlALS
0, Description
Airbag door brackets to fascia
Airbag door bracket to door frame assembly 5-7
5-7
US08 Notes I I
1 to be issued I I
X300 VSM iii Issue 1 August 1994

Black
Black
Black All
models
All Models
All Models
Black
Black All
Models
All Models
Black/
White Stripe
Black/
White Stripe
Black Non
Aircon.
Models
only
Non Power
Wash Models
only
Optional
0 Key to Fig. 1, hgine Compartment Relays, page 14.
Number v12 Color
All Models
SRO
B6.55.04
Rdaw
Horn
Location
Engine
compartment,
inside the left
hand side fuse box.
Engine
compartment,
behind left hand head
lamp assembly.
see starter
motor
solenoid. All
Models
1 ~~
All
Models 5 Starter Motor
Solenoid
4 All Models
All Models 18.30.34 Air-conditionin
g Water Pump
Wiper Motor
On
/Off
2 see starter
motor
solenoid.
see starter
motor
solenoid. All
Models
3 Wiper Fast /
Slow
18.30.71 Engine
compartment, behind right
hand head
lamp assembly. 8 EMS Engine
Management
System
Control
Black
I
All Models 9 Ignition Coil
PI Main Relay see
EMS
control.
see EMS
control. Black
I
All
Models 8
Air Pump 7 see EMS
control.
see EMS
control. Black
Air Injection
Black Air Con
- Model Air
Injection
only
All Models
18.30.34
86.55.08 Air
Conditioning
Compressor
Clutch
Relay Case
Engine
compartment,
on the right
hand side inner
wing valance.
Relay
Case Non Power
Wash
Models
only
11
10
12
Power Wash
Screen Wash Optional
All Models
All Models
Black
All Models
Ignition Relay
Engine
compartment,
inside
right
hand fuse box.
X300 VSM 33 Issue 1 August 1994

I SRO I Rdw* AJ16 v12
Automatic Automatic
Models only Models only
Automatic Automatic
Models only Models only
UK
& ROW -
Manual Seat
only
UK
& ROW -
Manual Seat
onh/
UK & ROW -
Manual Seat
only
Manual Seat
only
UK
& Manual -
Seat only
UK
& Manual -
Seat only
UK
& ROW -
Optional
Optional
Optional Optional
Keylock
Number
13
14
15
16
34
35
17
36
37
38
Driver's Seat Height
Control (Upward)
Driver's Seat Height
Control (Downward)
Passenger Seat
Height Control (Upward)
Passenger Seat
Height Control
(Downward)
Driver's Seat Heater
All Models
All Models
All Models
Passenger Seat
Heater
RH Front
Screen
Heater
LH Front Screen
Heater
Ignition All Models
25
All Models 26
All Models 23
Ignition
Air
-conditioning
Isolate
LH Blower
RH Blower
LH Blower
high
speed
RH Blower high
speed
Deadlock front
lefthear right All
Models All Models
20
Below gear selector 'J' gate.
Not NAS or
Japan
UK
& Europe
only
All Models
All Models
USA
&
Canada only
All Models
All Models
All Models
All Models
Below
gear selector
'J' gate.
Not NAS or
30
UK & Europe 31
All Models 28
All Models 29
USA & 27
All Models 24
All Models 33
All Models 22
All Models 32
Japan
only
Canada only
On
seat panel below
driver's seat.
86.55.78
86.55.74
On seat panel below
driver's seat.
Deadlock front
righthear left
Door Lock
Door Unlock
Driver's Door
Unlock
Mirror Heater
Puddle Lamps
Cigar Lighter
Fuel Flap Lock On
seat panel below
passenger's seat.
On seat panel below
passenger's seat.
On seat panel below
driver's seat.
On seat panel below
passenger's seat.
Left hand side footwell on
front
'A' post, behind cover.
Left hand side footwell on
front
'A' post, behind cover.
Fuse box assembly
RH side heelboard.
Fuse box assembly
LH side heelboard.
Behind
RH side heelboard.
Behind
RH side heelboard.
Behind RH side heelboard.
Behind
RH side heelboard.
Behind
RH side heelboard.
Behind LH side heelboard.
Behind LH side heelboard.
Behind LH side heelboard.
Behind LH side heelboard.
Behind LH side heelboard.
Behind
RH side heelboard.
Behind LH side heelboard.
Behind
RH side heelboard.
Behind LH side heelboard.
Color
Blue
Blue
Violet
Violet
Violet Violet Blue Blue
Blue
Blue
Blue
Blue
Blue
Blue
Blue Blue
Blue
Violet
Violet
Violet
Violet
Violet
Violet Blue
Blue
Violet All
Models All Models
All Models All Models
All Models All Models
18
X300 VSM 35 Issue 1 August 1994

86.52.01
86.91 -83
19.75.21
86.80.24
Universal garage door opener
Security
& Locking Control Module
(SLCM)
Sunroof
Mirror memory control
Seat
/ Mirror Memory (Passenger.)
Speed control
Air conditioning
(NCCM)
Transmission control
Engine Management
BPU (Body Processor Unit)
ABS (Anti
-lock Braking System &
Traction Control (where fitted).
(ABS/TC CM)
Bulb failure
Rear
Front
I Power steering
I Column / mirror ECM
Reader exciter
Location
Roof console panel
LH side upper wheel arch, inside the
trunk below fuel filler pipe
Roof console panel.
Mounted inside driver's
& passenger's
seat.
Behind passenger knee bolster.
RH side of air conditioning unit.
Behind passenger knee bolster.
RH side footwell in front of 'A' post
behind cover.
Behind passenger knee bolster.
Engine compartment below
anti-lock
braking system modulator.
Trunk inside electrical carrier box,
Engine compartment behind each
headlamp assembly.
LH side footwell on
'A' post, behind cover.
On the side of steering column.
Around the lock barrel of steering
column.
Behind passenger knee bolster below the
airbag module.
Behind bumper, LHS of vehicle
Numb
11
13
10
9
14
2
RHD
20 LHD
1
16
RHD
(1 2&6)
7 LHD
(12&16)
6 (12&16)
19 RHD
3 LHD
18 RHD
4 RHD
12
22
& 24
17 5
8
15 RHD
23 LHD
21
X300 VSM 39 issue 1 August 1994

Specification
w IfrnrnJ
FUSES
The following tables list all fuses (in their locations) used in the vehicle.
Engine Bay Fuse Box - left-hand side
Fuse No. Fuse Colour Code Value Circuit
lamps)
F1 Clear 25 Heated front screen - right-hand side (where fitted)
F2 Red 10 Main beam headlamp - left-hand side
F3 Clear 25 Starter solenoid
F4 Red 10 Lowered beam headlamp - left-hand side
F5 Red 10 Side light - front left-hand side
Turn indicator
-front left-hand side
Side repeater flasher
- left-hand side
F6 Yellow 20 Windshield wiper system
I F8 I Light Blue
I Not used
F9 - - Not used
- - F7
15
Water pump (air conditioning) I - -
-l
X300 VSM Issue 1 August 1994 AI-95MY 14

0
Engine Bay Fuse Box - right-hand side
Fuse No. Fuse Colour Code
- F1
F2 Red
F3
F4 Red
F5 Red
-
F6 Tan
F7 Clear
F8 Red
F9 -
FIO Tan
F12 Red
F13 Red
F14 Red F15
-
F16 Red
F17 Light Green
F18 Red
Value
(amps)
10
10
10
5
25
10
-
5
20
10
10
10
10
30
10
Circuit
Not used
Main beam headlamp
- right-hand side
Not used
Lowered beam
headlamD - riaht-hand side ."
Side light -front right-hand side
Turn indicator
-front right-hand side
Side repeater flasher
- right-hand side
Engine control module
(ECM)
Air pump (6 cyl. - where fitted)
Ignition coils
(VIZ)
Air conditioning clutch
Not used
Generator
Front lighting control module
- right-hand
Air conditioning clutch
Windshield wash
J headlamp power wash heaters and relays
Engine management system relay supply
Injectors
Engine management system
Starter relay Ignition coil sensing and air pump relay (6
cyl.)
Fuel injection relay
Engine management sensing
(VIZ)
Windshield washer pump
Lambda heaters
Idle speed control valve
Not used
Air pump control
Solenoid vacuum valve
(VIZ)
Water pump (supercharged)
Headlamp power wash pump
Front fog lamp
- right-hand side (where fitted)
0
0
Issue 1 August 1994 X300 VSM AI-95MY 15