1994 JAGUAR XJ6 engine

Climate Control Systems
0 14.5 FAULT CODES
J&&: Displayed error codes are NOT compatible with Jaguar Diagnostic Equipment (JDE).
23 Refrigerant Pressure Switch Open /short circuits. Low gas charge*
24 Differential Potentiometer. Open /short circuits
31 LH Fresh
/ Recirc.
Potentiometer I I I I RH Fresh / Recirc. Potentiometer
Open / short circuit in pot. feed.
32
, In certain
circumstances, the motor can over- 0 33 Cool Air Bypass Potentiometer
34 Defrost Potentiometer travel and log further faults.
35
36 Foot Potentiometer Cycling
the ignition two or three times can cure
this.
Centre
Vent Potentiometer
41
42
I LH Fresh / Recirc. Motor
I RH Fresh / Recirc. Motor
43 Cool Air Bypass Motor
44 Defrost Motor lines. Motor flap sticking
/ jammed.
Check
for short
/ open circuits in motor drive
1 45 I Centre Vent Motor I
1 46 IFoot Motor I
W: In ambient temperatures below OOC, the system may log fault code 23 because low ambient can cause a tem-
porary low gas pressure. In ambient temperatures above 35"C, the system may log fault code 23 as temporary
high pressure can exist within the system. *
Associated Faults
Other symptoms that may exist without storing fault codes:
Airlock in system.
Water pump inoperative.
Water valve stuck closed.
Faulty engine coolant thermostat.
Broken linkage.
Blower motors
- incorrect operation.
No heat
One vent failing to open /close
Poor airflow
X300 EDM 11 Issue 1 August 1994

Climate Control Systems
14.6 ACTUATOR CHECK
The system self test procedure drives all the actuator motors, to checktheir operation. If an actuator is operating incor- rectly or operating outside of its limits then a fault code will be present.
Before commencing with the actuator check procedure, ensure the car is operating under normal conditions.
Actuator Check Procedure
. Switch off the ignition.
. Press and hold the 'Auto' and 'Fresh / Recirc.' buttons simultaneously, and run the engine.
All the control panel LED's and all LCD segments will flash on and off. Any function LED indicator which does not
. Any LCD element which fails to flash on / off indicates a fault within the display element or panel.
. Press 'Auto'.
. Press 'Fresh / Recirc.' button to instigate actuator check mode.
. Use 'Face' to cycle through actuator mode conditions 20 to 27, as detailed in the table below.
flash
on
/ off suggests a fault condition within that area of the panel or, with the LED.
Press the 'Push Off button to restore normal operation with default panel settings, ie AUTO at 24OC.
1ynfe: * The water valve operates on a 6 second pulse, ie 3 seconds ON, 3 seconds OFF.
Issue 1 August 1994 12 X300 VSM

Climate Control Systems
14.7.4 Fault Code 14
Coolant Temperature
Input
0 Sensor, harness or A / CCM open circuit.
0 Sensor, harness or A / CCM short circuit to ground.
This input is derived from the instrument pack,
a continuity check can be carried out from pin 22, instrument pack (24-wayconnector), to pin 40 (16-way connector) of the A / C CM.
The instrument pack input from the engine coolant temperature sensor, is covered in the EDM, section 15, Instrument
Pack and Trip Computer.
14.7.5 Fault Code 15
Heater Matrix Temperature Sensor
0 Sensor, harness or A/ CCM open circuit.
0 Sensor, harness or A / CCM short circuit to ground.
This sensor measures the temperature of the heater matrix.
If the signal on pin 28 (12-way connector) remains at less than 1 volt, suspect either a short circuit to ground on the
signal wire or an open circuit on the 5 volt supply to the sensor. If the signal on pin 28 rises to approximately 5 volts
then suspect an open circuit on the sensor ground.
Checkthevoltage, against the graph below (Fig.
I), measured between pin 28 (12-way connector) and pin 19 (22-way
connector) A / C CM.
If the voltage is within the set limits, the system is operating correctly.
A resistance check can be carried out on the sensor and should conform with the figures below, measured between
pin 28 (12-way connector) and pin 19 (22-way connector) A/ C CM.
0°C 4.6
-5.1 lclL 15°C 2.1 - 2.6 lclL
If the resistance is outside the set limits, renew the sensor.
1ynfe:
Inspect sensor harness for open circuit or short circuit to ground. Rectify as necessary.
If the voltage is outside the set limits, renew the A / CCM.
The
resistance should continue to decrease as the temperature increases and vice versa.
*C
V
J86-1771
Fig.
Issue 1 August 1994 16 X300 EDM

Climate Control Systems
14.7.6 FaulfCode21
Solar Sensor
0 Sensor, harness or A / CCM open circuit.
0 Sensor, harness or A / CCM short circuit to ground.
The sensor provides a linear output response signal to
pin 35 (16-way connector) A/ CCM; the output ranges from 0 to 5 volts, the voltage will drop as light intensity increases.
A resistance check can be carried out on the sensor and should conform with the figures below:
With no light on the sensor, the resistance should read approximately 15
kL2.
With increasing light intensity, the resistance should decrease from 15 kQ.
Inspect the sensor harness for open circuit or short circuit to ground. Rectify as necessary.
If the sensor and harness appear correct, suspect the A/ CCM.
14.7.7 Fadf Code 22
Compressor lock Signal
(12 cy/. vehicles only)
0 Sensor, harness or A / CCM open circuit.
0 Sensor, harness or A/ CCM short circuit to ground.
The compressor lock sensor provides an
a.c. signal proportional to engine speed. As engine speed increases the a.c. signal voltage value will increase.
A voltage checkcan be carried out on the sensor and should read approximately 0.5V a.c. whilst the compressor is ON and OV whilst the compressor is OFF, measured between pin 26 (12-way connector) and pin 19 (22-way connector) A
/ C CM.
If the reading is OV whilst the compressor is ON, suspect the sensor or the sensor harness (open circuit or short circuit
to ground).
Check the resistance between pins 1 and 2 of the compressor lock sensor, value should be
190a & 20%.
If the resistance measured falls outside the limits, renew the compressor lock sensor.
Inspect the sensor harness for open circuit or short circuit to ground. Rectify as necessary.
If the sensor and harness appear correct, suspect the AI CCM.
X300 EDM 17 Issue 1 August 1994

Electrical IT
SECTION CONTENTS
Sub
-Section 15.2 lnsfrumenfs
Subsection Title SRO Page
15.2 ............. Instruments .................................................................... 15.2-1
15.2.1
............ Introduction .................................................................... 15.2-1
15.2.2
............ Instrument Pack Connectors - Pin Locations ......................................... 15.2-3
15.2.3
............ Component Description .......................................................... 15.24
15.2.3.1 .......... Speedometer ................................................................... 15.24
15.2.3.2 .......... Tachometer .................................................................... 15.24
15.2.3.3
.......... Engine Oil Pressure and Warning Lamp ............................................. 15.24
15.2.3.4 .......... Engine Coolant Temperature ...................................................... 15.24
15.2.3.5 .......... Fuel Tank Level Gauge and Warning Lamp .......................................... 15.24
15.2.3.6
.......... Battery Voltage Gauge and Warning Lamp .......................................... 15.24
15.2.3.7
.......... Liquid Crystal Display ........................................................... 15.24
15.2.3.8 .......... Trip Computer .................................................................. 15.2-5
15.2.4
............ Primary Warning Lamps (Illuminated Red) .......................................... 15.2-5
15.2.4.1
.......... Exhaust Temperature ............................................................ 15.2-5
15.2.4.2
.......... Low Oil Pressure ................................................................ 15.2-5
15.2.4.3
.......... Seat Belt ....................................................................... \
15.2-5
15.2.4.4
.......... Trunk Lid Open ................................................................. 15.2-5
15.2.4.5
.......... DoorAjar ...................................................................... 15.2-5
15.2.4.6
.......... Engine Coolant LeveL ............................................................ 15.24
15.2.4.7
.......... SRS Airbag Fault ................................................................ 15.24
15.2.4.8 .......... Charging Fault .................................................................. 15.24
15.2.4.9 .......... Brake System Fault .............................................................. 15.24
15.2.4.10 ......... Bark Brake ..................................................................... 15.24
15.2.5. ........... Secondary Warning Lamps (Illuminated Amber) ...................................... 15.2-7
15.2.5.1
.......... Transmission Fault ............................................................... 15.2-7
15.2.5.2
.......... Washer Fluid Level .............................................................. 15.2-7
15.2.5.3
.......... Bulb Fail ....................................................................... \
15.2-7
15.2.5.4
.......... Traction Control Fail ............................................................. 15.2-7
15.2.5.5
.......... Anti-lock Fail .................................................................. 15.2-7
15.2.5.6
.......... Low Fuel Level ................................................................. 15.2-7
15.2.5.7
.......... Check Engine ................................................................... 15.2-7
15.2.6.1
.......... Transmission Sport Mode ......................................................... 15.2-8
15.2.6.2
.......... Traction Control OFF ............................................................ 15.2-8
15.2.6.3
.......... Direction Indicators ............................................................. 15.2-8
15.2.6.4
.......... Main Beam .................................................................... 15.2-8
15.2.6
............ Status
and Warning Lamps ........................................................ 15.2-8
m
a
0
e
0
X300 EDM ii Issue 1 August 1994

Electrical IT
SECTION CON TENTS
Subsection 15.2 Instruments (continued)
Sub-Section Title SRO Page
15.2.7 ............ Fault Diagnosis ................................................................. 15.2-9
15.2.7.1
.......... Active High /Low Inputs ......................................................... 15.2-9
15.2.8.
........... Instrument Pack Pin-point Tests .................................................. 15.2-1 0
15.2.8.1 .......... Oil Pressure, Battery Condition, Coolant Temperature and Fuel Gauges ................. 15.2-1 0
75.2.8.2
.......... Speedometer .................................................................. 15.2-10
15.2.8.4
.......... Liquid Crystal Display .......................................................... 15.2-17
15.2.8.6
.......... Door Open Warning Lamp ...................................................... 15.2-12
15.2.8.7
.......... Exhaust Temperature Warning Lamp .............................................. 15.2-1 3
15.2.8.8 .......... Luggage Compartment Warning Lamp ............................................. 15.2-14
15.2.8.9
.......... Seat Belt Warning Indicator ...................................................... 15.2-1 5
15.2.8.3
.......... Tachometer ................................................................... 15.2-11
15.2.8.5
.......... Trip Computer ................................................................. 15.2-11
15.2.8.70
......... Park Brake Indicator ............................................................ 15.2-16
15.2.8.71
......... Main Beam Indicator ........................................................... 15.2-17
75.2.8.12
......... Direction Indicator Tell Tales ..................................................... 15.2-18
15.2.8.14
......... Washer Fluid Level Indicator ..................................................... 15.2-20
15.2.8.16
......... Brake Fluid Level Indicator ...................................................... 15.2-22
75.2.8.17
......... General Bulb Failure Indicator ................................................... 15.2-23
15.2.8.18
.........
75.2.8.19 .........
15.2.8.20 ......... Traction Control OFF Tell-tale .................................................... 15.2-24
0
75.2.8.13 ......... Generator IND Voltage Indicator ................................................. 15.2-19
7 5.2.8.15 ......... Engine Coolant Level indicator ................................................... 15.2-2 1
Transmission Sport mode Indicator ................................................ 75.2-24
Traction Control Failure Warning Lamp
............................................ 15.2-24
15.2.8.21
......... Anti-lock Failure Warning Lamp .................................................. 15.2-24
15.2.8.22
......... Check Engine Warning Lamp .................................................... 75.2-24
Issue 1 August 1994 iii X300 EDM

E I ect r ica I rl
Electrical schematic - No Air Bag MIL Lamp
0
+12v
1. Instrument Panel Fuse 2. Engine Compartment Fuse 3. Safing Sensor
4. Cable Reel Cassettes
5. Driver-side Air Bag
Fig.
1
J86-1663
6. Passenger-side Air Bag 7. RH Impact Sensor 8. LH Impact Sensor
9. Air Bag MIL Lamp
10. Diagnostic Module
X300 EDM 15.1 -7 ~~ Issue 1 August 1994

Electrical schematic - Continuous Air Bag MIL Lamp Illumination
0
J86-16&
1. Instrument Panel Fuse
2. Engine Compartment Fuse 3. Safing Sensor 4. Cable Reel Cassettes
5. Driver-side Air Bag
Fig.
1
6. Passenger-side Air Bag
7. RH Impact Sensor 8. LH Impact Sensor 9. Air Bag MIL Lamp
10. Diagnostic Module
X300 EDM 15.1 -9 Issue 1 August 1994