1998 JAGUAR X308 transmission

Automatic Transmission/Transaxle External Controls - 4.0L SC V8 - AJ26 -
External Controls
Description and Operation
Introduction
Operator gearshift control is effected by:
The selector lever Accelerator pedal position Kickdown The mode switch
Operator's Selector Module ('J' Gate)

Selector lever:
Gear selector positions are:
P Transmission mechanically locked, starting available * R Reverse gear N Neutral gear, no power to the rear wheels (starting available) D Drive gear, all 5 forward gears available (see Performance Mode Pushbutton) 4 Upshift to 4th gear only 3 Upshift to 3rd gear only 2 Upshift to 2nd gear only
Gearshift Interlock Manual Override*
The interlock system which locks the sele ctor in P and prevents the ignition key from being removed except when P is
selected, may be manually overridden in the event of an emergency.
1. 1. With the parking brake applied
2. 2. Remove the access blank using a suitable Torx bit
3. 3. Insert a small screwdriver into the vacated hole
4. 4. Push the screwdriver downwards, gently, and hold whilst simultaneously moving the selector from P towards R ,
but do not engage R until the tool has been removed
5. 5. An audible warning may be heard when operation 4 is carried out
6. 6. With the selector in N and the access bl ank replaced, the vehicle may be started
Range Selection
The selector lever transmits operator demand to the transmission and TCM by means of a cable and Dual-Linear
Switch (DLS).
The lever operates the transmission assemb ly selector shaft, only for P R N D , by means of a cable. Movement of the
lever across the gate to 4, 3 and 2 positions disengages th e cable from the selector lever and engages the DLS which
controls gear selection electronically.
Gear selector module:
Provides illumination of the decal relevant to the gear sele cted. This information is provided by CAN from the TCM. Illuminates the security system Active LED on the gear selector surround, in response to an output from the BPM.
Transmission Switches
Performance Mode Pushbutton
7—Connector - Climate control
8—Solenoid - Gear selector
9—Security system Active LED

The performance mode pushbutton:
Is mounted on the 'J' gate surround. This 'push-on push-off' swit ch selects Normal or Sport mode ( push-on for Sport) Is illuminated when Sport mode is selected. Is hard-wired to the transmission control module.
With 'Normal' selected the transmissi on will start off in 2 nd gear with kickdown to 1 st being available.
'Sport' mode allows 1 st gear en gagement from rest and modifies values in the TCM shift point calculations to provide higher
upshift speeds and enhanced availability of downshifts.
Kickdown Switch

The kickdown switch:
Is floor mounted under th e accelerator pedal. Is operated by pressing the pedal beyond the full throttle position. Provides maximum acceleration on driver demand, by signalling the TCM to select the lowest gear to give maximum
wheel torque.
Gear selector interlock solenoid:
Prevents the gear selector lever from being moved from P , unless the ignition switch is in position II, and the brake
pedal is depressed.
Is controlled by an output from the BPM
Park position switch:
Is hard-wired to the BPM Detects when the gear selector lever is moved to the Park position

Dual-Linear Switch (DLS)
The TCM detects gear selection by means of a switch fitted to the 'J' gate; the DLS contains two multi-track slider switches,
of which the upper controls P R N D and the lower 4 3 2 .
Output from the DLS is changed as the select or lever is moved, thus indicating selected gear position. The parallel signal is
input to the TCM by 4 discrete logic wires W0, W1, W2 and W3. The particular sequence, or gray code, will indicate which
shift position is selected, as shown in the following table where 0 = low and 1 = high:
Gray code
Transmission Unit Gear Selector

The gear selector at the transmission unit:
Is connected to the operator's selector module by cable Operates the selector valve, at the electro-hydraulic control unit


Selector PositionW3W2W1W0
P0111
R1110
N1101
D0100
41000
30010
20001

Automatic Transmission/Transaxle External Controls - 4.0L SC V8 - AJ26 -
External Controls
Diagnosis and Testing
Problem Solving - Transmission Shift
Quick Reference Fault Chart
Special Tool(s)

Digital multimeter

Generic scan tool
SymptomPossible SourcesAction
Shift stuck in P Selector cable seized
*GO to 44.15.08
*
Interlock solenoid not operating
*GO to PDU
*
Interlock latch seized
Transmission faulty
*
*Mechanical check
*
Operator sequence error
*Correct the sequence
*
Vehicle rolls on P Incorrect cable adjustment
*GO 44.15.07
*
Faulty parking pawl (transmission internal)
*Mechanical check
*
R does not engageIncorrect cable adjustment
*GO to 44.15.07
*
Transmission fluid level incorrect
*GO to 44.24.02
*
N not achievedIncorrect cable adjustment
Transmission faulty
*
*GO to 44.15.07
*
D does not engageIncorrect cable adjustment *GO to 44.15.07
*
Transmission fluid level incorrect
*GO to 44.24.02
*
Transmission faulty
*Mechanical check
*
Lower ratios will not holdExcessive engine temperature
DLS fault
*
*GO to PDU
*
Shift lever position not visually correctIncorrect DLS adjustment
*GO to 44.15.07
*
Shift lever has no effect upon the
transmission and resistance cannot be
feltCable disconnected or broken
Transmission selector problem
Shift lever drive pin adrift
*
*
*Mechanical check
*
Shift lever position not align correctly
following manual selection of lower
ratiosSliding block drive pin displaced - following road debris contact
*Mechanical check. Renew the selector if
damaged, or re-align the drive pin and
sliding block
*
Shift lever detent indistinct in 3
causing poor locationDLS detent fault
*GO to Renew the DLS
*
Shift may be moved from P without
brake pedal operationInterlock latch fault
*Mechanical check
*
Solenoid permanently activated
*GO to PDU
*
Engine may be started in positions
other than P or N Incorrect cable adjustment
DLS fault
*
*GO to 44.15.07
*
Shift lever vibrationLoose selector assembly
Cable isolation fault
*
*Mechanical check
*
Noise / rattle from 'J' gateDebris in the mechanism
*Clean
*
Worn 'J' gate track gasket
allowing lever and moulding to
contact
*GO to 44.15.05
*

Shift Selection and Gear Position
Symptom Chart
Pinpoint test A: P0705
Loose selector disc seal
*
SymptomPossible SourcesAction
DTC P0705 Transmission range sensor circuit
malfunctionSelector cable maladjusted
Linear switch maladjusted
Linear position switch fault
Harness fault
Connector pins(s) bent, loose or
corroded
*
*
*
*
*GO to Pinpoint Test
A
*
PINPOINT TEST A : P0705
TEST CONDITIONSDETAILS/RESULTS/ACTIONS
A1: RETRIEVE DTCS
• NOTE: Battery and or ECM disconnection prior to scanning wi
ll erase all data, ensure that the correct DTC is present.
Connect the scan tool 1
Have the DTC(s) and freeze frame data been recorded?
Yes GO to A2
A2: STATUS / RELATIONSHIP CHECK
Move the selector lever sl owly from P to 2 and back,
noting the illumination / positi on relationship as follows: 1
Does state illumination match the lever position in each
direction of travel?
Yes
GO to A4
No GO to A3
No With lever at D (when moving from 2 to P ) is 3 or 4
illuminated?
Yes GO to A3

Automatic Transmission/Transaxle External Contro ls - 4.0L SC V8 - AJ26 -
Brake Shift Interlock Actuator Manual Override
General Procedures



1. To override the gearshift interlock:
1. Unscrew the release catch blanking plug.
2. Insert the ignition key into the aperture, depress the release catch and simultan eously move the gear
selector lever from the Park position. The lever will
only move approximately 25 mm with the key
inserted.
3. Remove the ignition key and replace the blanking plug.

Automatic Transmission/Transax
le External Controls
- 4.0L SC V8 - AJ26 -

Kickdown Switch Adjustment
Gen
eral Procedures
1. Ensure that the throttle cable is correctly adjusted; refer to
Operation 19.20.06.
2. Refer to the PDU User Guide for relevant software - 1040.
3. With PDU connected, running and the message 'EXISTING
COMPONENTS TO BE TESTED YES / NO' displayed:
Select YES.
Select ENTER.

Fol

low the messages given on the screen.
4. Press ENTER on the PDU screen.

5. F
ollowing the PDU instructions:
Push the throttl

e pedal until li
ght contact is made with the
kickdown switch and hold in this position.
Pres
s ENTER on the display.
No

te the percentage throttle op
en data (displayed as a bar
graph).
• NOTE: Ensure that contact with the switch does not
result in movement of the switch.
R
elease the throttle pedal.
6. If the target 90% throttle open specification is NOT achieved
the switch must be ad justed as follows.

7. Di
sconnect the kickdown switch multiplug.
Move the car

pet for access.

8. Adjust
the kickdown switch to th
e value as defined in step 6.
R
otate the switch in th
e required direction.


9.
Veri
fy the setting.
10. With the PDU instructions completed, connect the kickdown
switch multiplug.