1994 JAGUAR XJ6 wiring

Electrical
FAULT CODE 45
Front Left Impact Sensor Incorrectly Mounted to Vehicle
Normal Operation
The DM monitors the resistance value between pins 21 and 3. If a resistance of greater than 2 Lamp will illuminate and fault code 45 will be present, indicating incorrect mounting of the LH
connections to ground at both the sensor case and the vehicle are necessaw to avoid this fa!
Possible Causes
0 Poor or dirty connection between LH impact sensor case and vehicle ground.
0 Poor or dirty termination at impact sensor internal ground.
0 Open circuit on wiring between DM pin 21 and impact sensor ground terminal.
Fault Diagnosis
1. Circuit -check
. Disarm the SRS system, and disconnect the battery earth lead.
. Disconnect the DM.
. Measure resistance between DM pin 21 and pin 3 (ground).
. Is the resistance greater than 2.08.
Yes - Proceed to step 2.
No - Renew DM
2. Sensor - check
. Disconnect RH impact sensor from main harness.
Measure resistance between sensor terminal 4 and ground.
. Is the resistance greater than 2.051 7
Yes -
. Remove sensor from mountings, clean all mounting surfaces (including chassis) and refit.
Re-test resistance and renew sensor if value is still above 2.0Q.
NO -
. Examine harness for broken, dirty or incorrectly seated connectors.
3. On completion.
. Arm and verify SRS system.
Issue 1 August 1994 15.1 -38
!.On is detected the MIL
impact sensor. Secure
Jlt.
Electrical
FAULT CODE 45
Front Left Impact Sensor Incorrectly Mounted to Vehicle
Normal Operation
The DM monitors the resistance value between pins 21 and 3. If a resistance of greater than 2.08 is detected the MIL
Lamp will illuminate and fault code 45 will be present, indicating incorrect mounting of the LH impact sensor. Secure
connections to ground at both the sensor case and the vehicle are necessaw to avoid this fault.
Possible Causes
0 Poor or dirty connection between LH impact sensor case and vehicle ground.
0 Poor or dirty termination at impact sensor internal ground.
0 Open circuit on wiring between DM pin 21 and impact sensor ground terminal.
Fault Diagnosis
1. Circuit -check
. Disarm the SRS system, and disconnect the battery earth lead.
. Disconnect the DM.
. Measure resistance between DM pin 21 and pin 3 (ground).
. Is the resistance greater than 2.08.
Yes - Proceed to step 2.
No - Renew DM
2. Sensor - check
. Disconnect RH impact sensor from main harness.
Measure resistance between sensor terminal 4 and ground.
. Is the resistance greater than 2.051 7
Yes -
. Remove sensor from mountings, clean all mounting surfaces (including chassis) and refit.
Re-test resistance and renew sensor if value is still above 2.0Q.
NO -
. Examine harness for broken, dirty or incorrectly seated connectors.
3. On completion.
. Arm and verify SRS system.
Issue 1 August 1994 15.1 -38 X300 EDM - X300 EDM
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rl Electrical
FAULT CODE 5 1
Diagnostic Monitor Internal Thermal Fuse - Intermittent Short to Ground
Normal Operation
The DM monitors voltages at various pins connected to the external circuitry as described in codes 13 and 14. On detec- tion of a short to ground in these circuits fault code 13 or 14 will be present, the MIL Lamp illuminated and the internal
thermal fuse will blow. If the short is intermittent and clears, code 51 will be present, indicating the internal thermal
fuse has blown. If the short appears again the fault memory will revert to the higher priority code 13 or 14 display. The
DM must be renewed after short circuit is located.
Possible Causes
0 Damaged harness wiring or external components.
0 Air bag deployed.
Issue 1 August 1994 15.1 - 40 X300 EDM

Electrical
RAPID CONTINUOUS MIL LAMP FLASHING
Normal Operation
The front impact sensors each have three connections to the DM: supply, supply monitor and ground monitor. If the DM detects that both sensor supplies are disconnected and that both sensors are not grounded correctly the MIL Lamp
will flash, continually, indicating both sensor circuits are open.
Possible Causes
0 Botch front impact sensors disconnected or main wiring harness disconnected.
X300 EDM Issue 1 August 1994 15.1 - 46

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15.2.8 INSTRUMENT PACK PIN-POINT TESTS
15.2.8.1 Oil Pressure, Battery Condition, Coolant Temperature and Fuel Gauges
Gauge reads zero, full scale, too high or low
1.
2.
3. Oil
pressure and coolant gauges only; check relevant fluid level is within limits, top up if required and re-check
indication. If fluid levels are within limits on checking proceed to step 2.
Check connections to sensor are correct and secure. For battery gauge only check battery voltage is present at the
battery terminal posts.
Check resistance of sensor (if applicable) to ground, correct readings are as detailed in the following table:
Sensor title Resistance value
Oil pressure 3108 - 3308
Temperature
Fuel level 3461
(warm engine)
- 2418 (cold engine)
8061 (full tank) - 9008 (empty tank)
If resistance is out of range renew sensor.
If sensor resistance is proved correct, check the harness wiring continuity between the sensor and instrument pack
pin as detailed in the table below:
4.
I Sensor title I Instrument pack pin !
I Oil pressure I 21 (24-way connector) I Temperature I 19 (24-way connector) I
Fuel level 120 (24-way connector)
For battery condition gauge, checkvoltage between instrument pack 24
-way connector pins 2 and 4 is 13 f 2.5V. Refer to Section 15.5 for battery diagnostics.
If all previous checks prove correct remove and open the instrument pack. Examine flexi-circuit connections to
relevant gauge, ensuring correct and secure fitment.
Check continuity of flexi
-circuit tracks to gauge connections.
Check continuity of gauge driver windings by disconnecting gauge from flexi
-circuit and testing between the
upper central connection pin and each of the other two pins. If open circuit is recorded renew gauge.
5.
6.
7.
Gauge fluctuates
or gives erratic readings
1. Carry out steps 1 -4 above.
2.
Fit new sensor (where applicable) and re-check gauge.
3. Carry out steps 5
- 7 above
15.2.8.2 Speedometer
Gauge reads zero, full scale, too high or low
1.
2.
3.
4.
5. Refer
to Section 12,
ABS / Traction Control for fault diagnosis of wheel speed sensor.
Check harness wirin and connection from Instrument pack pin 15 (24
-way connector) and ABS /Traction Control
Control Module (AB!! /TC CM).
If all previous checks prove correct remove and open the instrument pack. Examine flexi
-circuit connections to
speedometer, ensuring correct and secure fitment.
Check continuity of flexi
-circuit tracks to speedometer connections.
Check continuity of speedometer driver windings by disconnecting from flexi
-circuit and testing between the
upper central connection pin and each of the other two pins. If open circuit is recorded renew speedometer.

6 15.2.8.3 Tachometer
Gauge reads zero, full scale, too high or low
1.
2.
3.
4.
5. Refer
to Section 5, Engine Management for fault diagnosis of tachometer signal.
Check harness wiring and connection from Instrument pack pin
24 (24-way connector) and Engine Management
Control Module (ECM).
If all previous checks prove correct remove and open the instrument pack. Examine flexi-circuit connections to
tachometer, ensuring correct and secure fitment.
Check continuity of flexi
-circuit tracks to tachometer connections.
Check continuity of speedometer driver windings by disconnecting from flexi
-circuit and testing between the
upper central connection pin and each of the other two pins, If open circuit is recorded renew tachometer.
15.2.8.4 Liquid Crystal Display
No (or patchy) illumination
1.
2. If no illumination check rear of instrument pack for attachment of 'PECUS' label. If label is not present then pack
will not have been programmed.
Check bulbs in rear of LCD module, renew as necessary.
Missing or Corrupt Segments
1. Switch ignition off, leave off for a minimum of 5 minutes, switch on and re-check panel display.
2. If display is still faulty remove instrument pack from vehicle and checkconnections between flexi-circuit and LCD
module.
15.2.8.5 Trip Computer
Inaccuracy
1. Check fuel sender, ABS /TC CM and ECM signals to instrument pack.
Issue 1 August 1994 X300 EDM 15.2 - 11

Electrical
15.2.8.7 fxhausf Temperafure Warning lamp (Active Low -Japan Only)
U: This lamp is present in all vehicle instrument packs but only Japanese market cars have the sensor circuitry
installed and connected. The lamp will be illuminated during instrument pack reset sequence
at each ignition
cycle.
1. Ensure harness wiring is intact from instrument pack pin 23 (48-way connector) to catalyst switching module and
from switching module to each thermocouple.
2. Check continuity across each thermocouple, renew if open circuit is recorded.
3. Measure voltage at pack pin
23,48-way connector, 0 volts indicates signal low ie lamp ON. A value of 12V at pin 15 indicates healthy signal, or no sensing circuitry fitted.
I 20
L
I WG
Exhaust temperature sensors
*+12V present only when ignition ON
'IS24
1. Instrument pack 20. Catalyst switching module
21. Thermocouple
J86-1900
Fig. 1 Exhaust Temperature
x300 EDM 15.2 - 13 Issue 1 August 1994

15.2.8.17 General Bulb Failure lndicator (Active Low)
1. Check all monitored bulbs are operating correctly and have clean contacts.
2.
3.
4.
When bulb failure lamp is illuminated and direction indicator tell tales flash at double the normal rate suspect a
fault in the direction indicator circuitry or bulbs.
Check
all lighting modules (LH front, RH front and rear) are correctly connected. Check harness continuity from
modules to BPU.
If indicator tell tales do not flash at double normal rate check wiring harness continuity between pin 43 (48-way
connector) and Logic Control Module (LCM) harness connections 8 (LH and RH side) and 6 (rear).
(48 WAY) P4
1
1. Instrument pack
10. Lighting module (LH front) 11. Lighting module (RH front)
12. Lighting module (rear)
J86-1844
Fig. 2 General Bulb Failure Indication
X300 EDM 15.2 - 23 Issue 1 August 1994

0 15.3.3 SYSTEM FLOW CHARTS
Systematic fault diagnosis of the speed control system cannot be accurately achieved by attempting to simulate actual
driving conditions. The system can only be reliably and safely tested using Jaguar Diagnostic Equipment.
15.3.4 DIAGNOSTIC SUB-ROUTINES
The following information details possible fault conditions, causes and remedies.
components are covered in Pin-point Tests. Detail test procedures
for
Fault: System inoperative
Possible causes:
1. Fuse FIO (LH 'A' post base fuse-box) blown.
2. Pneumatic circuit fault (ie vacuum leak)
3. Brake switch fault.
4. Clutch switch or link fault. Gear position input fault (automatic transmission only).
5. Harness wiring or connector faulty.
6. Set switch faulty.
7 Paddle switch faulty
8. Traction control input high.
9. Road speed input missing.
10 Dump valve failure.
11 Vacuum pump 1 control valve unit failure.
Remedy: 1. Examine fuse F10, if blown determine reason for failure and renew.
2. Examine all pipework, connections and components for damage or
disconnections, repair
or renew as necessary.
3. Check brake switch operation, renew if necessary.
4. Check clutch switch operation (manual transmission) or link connection I position input
(automatic transmission), renew if necessary.
5. Examine harness wiring. Examine connectors for corroded, damaged or distorted pins.
6. Check set switch operation and wiring, renew if necessary.
7. Check paddle switch operation and wiring, renew if necessary.
8. Examine harness wiring between SC CM and ABS / TC CM, check ABS /TC CM fault
diagnosis.
9. Examine harness wiring between SC CM and instrument pack, check pack fault diagnosis.
10 Renew faulty valve.
11 Renew faulty unit
0
Fault:
Cause:
1. Clutch pedal switch or harness failure.
Clutch pedal operation does not disable system
1. Remedy: Check switch operation and wiring connections. Repair or renew switch / wiring
as necessary.
Fault:
Cause:
1, Faulty signal from gear selection module.
Remedy: 1. Examine transmission fault diagnosis.
Neutral gear selection does not disable system (automatic transmissions only)
2.
2.
Harness wiring or connector fault
Examine harness between gear selection module and SC
CM pin 18.
X300 EDM 15.3 - 5 Issue 1 August 1994