1994 JAGUAR XJ6 brake

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TCM
Pressure switch manifold X 03 Pressure switch manifold Z 04
Performance mode select 05 Calibration select 06
Engine toque reduction 07 Throttle position 11 Engine troque 12 Sensor ground 14 Pressure switch Y 22
Traction control inpuit 23 Kickdown switch 24 Brake switch 25
Transmission temperature 26 Engine speed 30 Vehicle speed output 34 Transmission output speed 36
Transmission input speed 37 Shift solenoid A 39 Transmission malfunction lamp 40 Sport mode lamp 41
Torque converter clutch 42 Shift solenoid B 43 Force motor low 49 Transmission input speed GND 50 .ransmission output spped GND 51 Force motor high 52
55
Vban
53 Vignition
16JDSLIscantool
45 JDS K I scan tool
54 Power ground
I TRANSMISSION Ignition
-OK -OB
-Rw -P - su - GN -Pw - BU -ON - RP - BS - PU - OY - BIN - SB -U -G -OR -s
- GU -ow - OP -0s -N -R
-OB
14/01 Transmission input speed GND
14/02 Transmission input speed
13/01 Transmission output speed GND
13/02 Transmission output speed
1 - 12/10 TCCsolenoid high
- 12/09 TCC solenoid signal
-
-
- -
12/03 Shift solenoid A high
12/01 Shift solenoid A signal
12/03 Shift solenoid B high 12/02 Shift solenoid B signal
-
- 12/13 Force Motor Signal
1211 1 Force motor HI
-
-
-
12/04 Pressure switch manifold X
12/04 Pressure switch manifold Y
12/04 Pressure switch manifold Z
- 12/07 Transmission temperature
- 12/08 Sensor GND
44 Transmission malfunction
14 Sport mode indication
ABS 1 TC CM
03 Traction control signal
iI I
VI2 EMS
II
I -
I - 03 Engine torque
I - 06 torque reduction request
I - 10 Engine speed
I - 07 Vehicle speed
04 throttle position
I
I
I
I - I 04 throttle position
I - 03 Engine torque
I - 06 torque reduction request
I - 10 Engine speed
I - 07 Vehicle speed
I
I
I
I I
I 6 Cyl. GEMS I
I
I
I
1- I
I- 22 Engine speed I
I
,I I
I
I
I - 33 Engine toque
26 Torque reduction request
I - 32 Throttle position
' Performance Mode I
I
000 I
Switch I
I
02 Performance mode select
I
Vban + oq 04 I
r---- 1
I
Brake Switch
I
r---- 1
I
Kickdown Switch
I

Automatic Transmission (V12) Powertrain
Engine Speed
The engine speed is provided by an open collector signal supplied from the engine management control module
(ECM).
Throttle Position
This signal, from the ECM, performs the following two functions:
1.
2.
Engine Torque (and warm-up)
This signal, from the ECM, performs the following three functions:
1. During cranking to convey the completion of an engine warm
-up cycle to TCM.
2. To convey engine torque information, under normal running conditions, to TCM.
3. To convey engine torque fault signals to TCM.
Engine ‘warm
-up’ cycle commences from ignition ON until 500ms after the engine exceeds 400rpm. After this time
delay either an engine torque, or torque fault signal will be transmitted.
Transmission Input Speed
The transmission input speed sensor is mounted within the transmission housing and produces a variable frequency
signal, directly proportional to forward clutch housing rotational speed which is transmitted to the TCM. Sensor resis- tance equals 1.25kQ f 0.25.
Transmission Output Speed
The transmission output speed sensor is mounted within the transmission housing and produces a variable frequency
signal, directly proportional to the rear carrier rotational speed which is transmitted to the TCM. Sensor resistance
equals
1.25w2 + 0.25.
hake Application
When a brake application signal is received, due to brake switch operation, the torque convertor clutch lock-up sole- noid is de-energized, releasing lock-up mode if already applied
Transmission Oil Temperature
The transmission oil temperature sensor, located within the internal harness, monitors oil temperature and transmits a corresponding signal to the TCM.
To convey throttle position information to the TCM.
To indicate fault conditions between ECM and throttle potentiometer.
8.2.4.2 OUTPUTS
Gear Shift Solenoids
The two gear shift solenoids, located within the transmission housing, determine gear ratio when the selector is in any
of the forward gear positions.
Force Motor
The force motor, mounted within the transmission housing acts as a transmission torque fluid pressure regulator.
Torque Converter Clutch (TCC) Solenoid
The torque converter clutch solenoid, mounted within the transmission housing, provides a direct drive from the en- gine, via the converter clutch, to the driven wheels, giving the efficiency of a manual gearbox. The solenoid also pro- vides a ’ramp‘ apply and release to engage / disengage the clutch gently.
0
0
0
e
X300 EDM Issue 1 August 1994 6

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

Srake Switch lnpiit Malfiincfion - PO703
Function:
Monitoring of brake switch operation.
Connection: TCM Connector
CC048/025 CC003/009
Possible causes:
. Faulty switch, wiring or connection.
Effects:
Torque converter clutch operation may be abnormal.
Remedy:
. Repair or renew switch, wiring or connector. Switch
CA072/001
Ground
CA002/002
P2!
1
Brake
switch input malfunction -fault code PO703
I -I I I I I I ,I
J86 - 1741 Fig. 1
Issue 1 August 1994 10 X300 EDM

Brakes (a)
SECTION CONTENTS
Sub-section Title SRO Page
12.1 ............. Component Locations .............................................................. 1
12.2 ............. System Description ................................................................. 2
12.3
............. Component Descriptions ............................................................ 5
12.4 ............. System Fault Indication ............................................................. 6
X300 EDM i Issue 1 August 1994

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