1998 JAGUAR X308 manual transmission

Range Selection
The 'J' gate selector lever is connected to the transmission via a cable which operates the transmission selector shaft
between positions P R N D only. The shift lever disconnects from the cable when the lever is moved across the gate from D
to 4 .
Movement of the lever between P R N D manu ally controls the flow of transmission fluid, the TCM having control of the
forward gear selected in D .
Movement of the lever to 4 , 3 and 2 positions does not manu ally modify the fluid flow, the TCM detects these positions
using the DLS and controls the ratios electronically by energizing solenoids.
Shift Point Control
The gearshift points are controlled by the TCM, as a function of the output speed, engine load, engine speed, selector
position and shift program selected. The operator has control over the shift points via the shift lever, throttle pedal
movement, kickdown function and mode switch.
Mode Switch
This switch allows operator selection of two base shift modes; Normal and Sport; th e switch being illuminated when Sport is
selected. This function alters the values in the TCM shift point calculations.
Shift Programs
Upon encountering the following conditions, the TCM will auto matically modify the Normal or Sports shift map to enhance
the operation of the vehicle:
1. 1. Traction: When traction intervention is active.
2. 2. Hot mode: Extreme engine/transmission temperatures.
3. 3. Gradient: Under specific speeds and loads.
4. 4. Manual: Driver initiated override of the normal shif t map when the LH side of the 'J gate' is used.
Traction
When traction or stability control (engine or brake system de rived) is operational the TCM will implement the traction map
to maximize control of wheel slip.
Gradient
The gradient function is intended to enhance vehicle drivea bility when climbing a gradient or towing. The TCM will
implement the function when increased driving resistance is de tected, and provides enhanced driveability, additional cooling

Is hard-wired to the transmission control module.
Kickdown Switch (where fitted)

The kickdown switch:
Is floor mounted under the accelerator pedal. Is operated by pressing the pedal to the full throttle position. Provides maximum acceleration on driver demand, by signal ling the transmission control module to select the lowest gear to give maximum wheel torque.
Transmission Unit Gear Selector

The gear selector at the transmission unit:
Is connected to the driver's selector module by a Bowden cable. Operates the manual selector valve, which is part of the electro-hydraulic control unit. Operates the rotary switch, which is connected to the transmission control module.
Transmission Switches
Location, Rotary Switch

Automatic Transmission/Transaxle External Controls - 4.0L NA V8 -
AJ27/3.2L NA V8 - AJ26 - Brake Shift Interlock Actuator Adjustment
General Procedures

1. Disconnect battery ground cable.
Remove the battery cover.
2. Remove the J-gate surround, Section 501-05.
3. Remove the console finisher ve neer panel, Section 501-12.

4. Remove the interlock soleno id actuating lever cover.

5. Move the shift lever to N.
Operate the gearshift interlock latch manually to release
the selector lever from P .

6. NOTE: Assistance from anot her person is required.
Adjust the gearshift interlock solenoid. 1. Slacken the solenoid fixings.
2. Hold the selector lever midway between P and R .
3. Move the solenoid rearwards, against spring pressure, to take up the free play.
4. Tighten the soleno id securing nuts.
5. Ensure that the interloc k actuating lever has no free
play with the selector lever midway between P and

Automatic Transmission/Transaxle External Controls - 4.0L NA V8 -
AJ27/3.2L NA V8 - AJ26 - Brake Shift Interlock Ac tuator 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.

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

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
*

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.

Align the drive peg and lower sliding block of the switch to
the mating components of the selector mechanism.

2. Install the four screws, bu t do not fully tighten.
Remove the Ty-Strap from the dual linear switch.
Use the manual release and repo sition the selector to 'N'
for installation of the selector cable.

3. Connect the electrical connector to the linear switch.

4. Assemble the cable to the gear shift assembly.
1. Locate the outer cable and fit the inner cable to the gear selector arm. Tighten to 22-28 Nm.
2. Position the abutment nuts to the approximate position, but do not tighten.
5. NOTE: When setting the selector cable, ensure that the
selector lever on the transmission ca sing is still in the 'N' position.

Adjust the selector cable from inside the vehicle.
1. Confirm that the selector lever is in the 'N' position.
2. Adjust the nuts to lock against the bracket without