1994 JAGUAR XJ6 sensor

8.2.6 DIAGNOSTIC FAULT CODES
The following codes are stored within the TCM whenever a fault is detected on the system. The codes relating to OBDll legislation can be accessed using Jaguar Diagnostic Equipment or a hand-held, proprietary scan tool.
Code 1 Description [ OBDII i Page No.
PO605 I TCM internal error Y 8 I
PO703 Brake switch input malfunction N I 9
PO706 Transmission range sensor fault Y I 10 1
1 PO7 12 Transmission fluid temperature sensor low input Y , 11
PO713 Transmission fluid temperature sensor high input Y 11
PO7 15 Turbine / input speed sensor malfunction Y 12 I
I PO716 I Turbine / input speed sensor range / performance IYll21
I PO720 I Output speed sensor circuit malfunction Iy 13 I
1 PO721 [Output speed sensor circuit range / performance Iy 13 I
I PO726 1 Engine speed input circuit performance Iy 14 I PO727 Engine speed input circuit no signal Y I 14
PO730 Incorrect gear ratio Y 15
PO7 4 1 TCC system stuck off Y 16
PO742 TCC system stuck on Y 16
16
PO743 TCC system electrical
17 Pressure control solenoid electrical PO748
ZhTfi solenoid A performance Y 18 PO751
__ p0753-- - -- Shift solenoid A electrical Y 18
Shift solenoid B performance Y I 18 PO756
PO758 Shift solenoid B electrical Y 18
PO780 Shift malfunction (Max-adapt) N 19
PI739 Transmission component slipping Y 19
- __ -
___ __ Y
N - ~_ ~
~
- _____ - __.__ ~ ~~~
~~
I
___. ________ I
__
PI780 Torque
reduction signal malfunction Y 20
PI781 Engine torque signal malfunction Y 20
PI782 Traction active input fault N 22
PI783 Transmission over temperature condition N - I I PI791 I Throttle position electrical signal failure Y 23
Issue 1 August 1994 8 X300 EDM

Powertrain Automatic Transmission (V12)
Transmission Range Sensor Fault - PO706
Function:
Gear selection identification.
Connection: TCM Mu Iti-pl ug Pressure Switch Manifold
Connector
CC048/003 GBO 10/007 GB012/004 (mode X)
CC048/022 GBO 10/008 GB012/005 (mode Y)
CC048/004 GBO 1 O/OOS GB012/006 (mode Z)
Possible causes:
. Faulty harness wiring or connection from pressure switch manifold.
. Faulty operation of pressure switch manifold.
Effects:
. Incorrect gear selections, ie D2 and D3 not selectable.
9 MIL illuminated.
Remedy:
. Repair or renew harness / connectors.
. Renew manifold.
Po:
Pi
PC
1
Transmission range sensor -fault code PO706
I 2
JE6. 1742 Fig. 1
X300 EDM 11 Issue 1 August 1994 ~~ ~~ ~

Automatic Transmission (V12) Powertrain
Transmission Fluid Temperature Sensor Input low/ high - PO712 / PO713
Function:
Fluid temperature monitoring.
Connections: TCM Connector Multi-plug Connector Transmission Connector
(CC048) (GBOIO) (GB012)
PIN 26 - SIGNAL
PIN 14
- GROUND PIN
10 - SIGNAL
PIN
11 - GROUND PIN
07 -SIGNAL
PIN
08 - GROUND
Possible causes:
8 Faulty sensor.
8 Faulty harness wiring or connection to sensor.
Effects:
. MIL illuminated.
. Poor gearshift quality
Remedy:
. Renew sensor.
8 Repair or renew harness I connectors.
P2E
P14
Transmission fluid temperaturesensor-fault codes P0712/P0713
1
Fig. 1 JR6 1743
0
0
X300 EDM Issue 1 August 1994 12

Automatic Transmission (V12) Powertrain
Input Speed Sensor - range /performance and malfunction - PO715 / PO716
Function:
Received speed monitoring.
Transmission Connector
(GB014)
PIN 02
PIN 01
Connections: TCM Multi-pl ug
Connector
(CC048) (GB015)
PIN 37 PIN 03
PIN 50 PIN 04
Data:
Sensor resistance = 1.25kQ f 0.25
Possible causes:
9 Faulty sensor.
9 Faulty harness wiring 1 connectors.
Effects:
. MIL illuminated.
. Harsh gearshifts, no torque converter clutch control.
. No fourth drive gear (Fault Code PO716 only).
Remedy:
. Repair or renew harness 1 connectors.
Renew sensor.
0
0
1
Input speed sensor - fault code PO715 / PO716
J86 - 1714
Fig. 1
X300 EDM 13 Issue 1 August 1994

Automatic Transmission (V12) Powertrain
Output Speed Sensor - PO720 / PO72 1
Function:
Delivered speed monitoring.
Connections: TCM Multi-plug
Connector
(CC048) (GB015)
PIN 36 PIN 02
PIN
51 PIN 01
Data:
Sensor resistance = 1.25kQ f 0.25
Possible causes:
. Faulty sensor.
. Faulty harness wiring /connectors.
Effects:
. MIL illuminated. Transmission
Connect or
(GBO 13)
PIN 02
PIN 01
. Second gear selected permanently ie 'Limp Home' mode.
Remedy:
. Repair or renew harness /connectors.
Renew
sensor.
PX
P51
1 Output speed sensor -fault codes PO720 / PO721
586. 1?45
Fig. 1
0
0
0
X300 EDM Issue 1 August 1994 14

0
0
0
Brakes (
12.1 COMPONENT LOCATlONS
Fig. 1 AJ16 (normally aspirated)
Fig.
2 AJ16 (supercharged)
Fig.
3 VI2
Key to Figs. 1,2 and 3:
1. Throttle position sensor 4. ABS motor
2. Traction control actuator 5. Valve block 3. Pump 6. Control module (ABS / TC CM)
X300 EDM 1 Issue 1 August 1994

Brakes
12.2 SYSTEM DESCRIPTION
The anti-lock braking system (ABS) and traction control system CTC) comprise the following components:
0 Hydraulic module: incorporating a pump, motor, low pressure accumulator, valve block, and either an ABS Con-
trol Module (ABS CM) or an ABS / TC Control Module (ABS / TC CM).
U!&: Within the hydraulic module are contained the electro-hydraulic inlet and outlet valves which regulate brake
system pressure.
o Four wheel speed sensors; hub end mounted.
0 Three warning indicators plus a Brake Warning Lamp and a Traction OFF / ON switch; fascia mounted.
0 Throttle valve flap positioning mechanism; mounted adjacent to the hydraulic module.
0 Various auxiliary inputs; providing information to ABS / TC CM.
0 Diagnostic IS0 communication BUS input / output link.
The solenoid operated hydraulic valves
are activated by signals, from the ABS /TC CM, which are generated using in-
formation received from the wheel speed sensors.
For vehicles without traction control thevalves operate on threecircuits, two front and one rear, as necessaryto prevent
wheel locking during braking. Brake pressure is modulated individually
at the front wheels and collectively at the rear.
Rear wheel control operates
a 'select low' principle such that locking in either wheel is sensed, and controlled brake
pressure is applied to both wheels.
Vehicles with traction control fitted have
all four wheels individually controlled allowing selective regulation of tractive
and braking force to each wheel as necessary when traction control is in operation.
The ABS
/ TC system as a whole is monitored constantly by the ABS / TC CM and is disabled (switched off until fault
is rectified) automatically when certain failures are identified. In the event of
a failure being detected the ABS and TC
MIL lamps, located on the instrument panel will illuminate. Full boosted brake operation and normal acceleration con- trol is available when ABS /TC is disabled. The system will be disabled when the following conditions occur:
0 Valve failure.
0 Sensor failure.
0 Main driver failure (internal ABS / TC CM fault).
0 Redundancy error (internal ABS / TC CM fault).
0 Over-voltage.
0 Pump motor failure.
0 Throttle valve actuator motor failure.
In the event
of under-voltage both ABS and TC will be disabled and the ABS andTC MIL lamps on the instrument panel
will illuminate.
U!&: The TC MIL lamp will only illuminate providing a voltage is still present at pin 15 'IGN FEED'
Throttle potentiometer failure will disable the TC function only and illuminate the TC MIL lamp.
The
moduleABS/TC CM is activated when ignition is ON, after an initiation period of approximately 1.7 seconds. After
this time delay the control module is ready to process signals provided from the various input sources and, using the
software defined algorithm, control the electrical and hydraulic circuits.
The inductive sensors attached to each of the four wheels provide speed signals to the ABS
/ TC CM. These signals are processed by ABS/TC CM giving comparison between individual wheel speeds, controlling braking or traction as
necessary and generating a pulse to drive the speedometer. Each sensor is monitored for open and short circuit failure,
causing disabling of ABS / TC on detection of a fault condition.
Issue 1 August 1994 2 X300 EDM

Brakes (a)
The input frequency of each sensor signal is translated, by the ABS /TC CM, into a comparable wheel speed. Should
any sensed speed be in excess of 330 km / h the relevant sensor is designated 'faulty' and ABS /TC control disabled.
Similarly ABS/TCcontrol is inhibited (switched off until fault condition is cleared) at speeds up to 40 km/ h whenfre- quency fluctuations are detected that are inconsistent with wheel rotation. At speeds above 40 km / h both systems
are disabled when inconsistencies are detected.
Traction control (where fitted) is achieved by using
a small motor and pulley arrangement to adjust the position of the
throttle flap. Under normal operating conditions the system is enabled by default. Operation of the Traction OFF / ON switch, located on the RH side of the fascia switch pack, disables the system and illuminates the TRACTION OFF lamp
located in the instrument pack.
Control is effected to prevent wheel spin by regulating (reducing) the throttle flap position, irrespective of the acceler
-
ator pedal position, using sensor signal comparisons and applying braking force to the wheel affected. Precise posi- tioning of the flap is achieved by monitoring the position of a throttle position sensor. When traction control is
requested
a gearshift inhibit signal is transmitted to the traction control module and cruise control (if selected) is dis- abled.
1
2
3
4
Battery positive feed (via fuse F7,located in the left-hand 'A' post lower fuse-box).
Battery positive feed (via fuse
F7,located in the right-hand 'A' post lower fusebox).
Gearshift inhibit
- during traction control.
Cruise control inhibit
- during traction control.
5/6 Wheel sensor
- LHF
7/8 Wheel sensor
- RHF
9/10 Wheel sensor
- LHR
Control Module Connections
Control module connections numbering 1 - 28, inclusive, provide the necessary input / output signals to enable the
module to control and monitor ABS / TC operation.
Connections are as follows:
13 Ground
14 Ground
15
16
17
18
19 Not used
20 Brake pedal switch.
21
22
23
24
25
26 Throttle position sensor wiper.
27 Throttle position sensor ground.
28 Diagnostic
IS0 communication bus.
Ignition
feed
- monitoring battery voltage to ignition switch.
Throttle valve actuator motor
- battery voltage reference.
Throttle valve actuator motor switching
-during traction control.
Traction inhibit
- via traction OFF / ON switch.
ABS MIL
- malfunction indicator lamp.
ABS ground
- illuminates ABS MIL lamp if ABS /TC CM connector loose or not fitted.
TC MIL
- malfunction indicator lamp.
RL out
- LHR wheel sensor signal drive pulse to speedometer.
Throttle position sensor
5V supply.
I 1 11/12 1 Wheel sensor - RHR 1
X300 EDM 3 Issue 1 August 1994