1998 JAGUAR X308 ECU

20. Reposition the coolant header tank and tighten the securing
bolt to the specified torque figure.
21. Refit the air intake tube, MAFM and air cleaner cover
assembly. Refer to Operation 19.10.30.
22. Refit the engine covers. re fer to operation 12.30.06.
23. Connect the battery and fit the battery cover..
Reset the radio and the clock.
24. Refill the transmission with new fluid. Refer to Operation
44.24.02.
25. Remove the protection sheets and close the engine
compartment.

In the event of a system fault, the TCM will adopt 'limp home' mode.
Electrical control
Refer to Section 307-01B.
Transmission Control Components
Transmission Control Module (TCM)
The TCM controls the transmission internal components thus determining gear selection and shift pattern.

The TCM is located in the same housing as the engine control module (ECM) and is accessed in the same manner. With the
two connectors unplugged the TCM may be withdrawn, complete with mounting bracket. The mounting bracket is secured to
the TCM by 2 locknuts.
Operation
CAUTION: Disconnection of OTHER contro l module connectors and / or the vehicle battery, may introduce fault codes
(DTCs). Following rectification and reconnection, ensu re that no induced codes exist in the TCM memory.
The TCM processes input and output in both analogue and di gital form which may be summarized in four categories:
Input Signals
Gear selector position (Dual Linear Switch x 4 inputs see 307.05) Transmission oil temperature Kickdown Speed sensor #1 Speed sensor #2 Mode switch

CAN Input Signals
Traction status ABS malfunction ABS status Engine torque status Throttle position Accelerator pedal position Engine torque reduction confirmation Engine speed Engine coolant temperature Cruise status OBDII fault code clear request Throttle malfunction warning RED or AMBER All road wheel speeds Token for network status ECM Token for network status INST Token for network status ABS Diagnostic data in from external device (PDU)
Output Signals
Solenoid valve 1 <-> 2 and 4 <-> 5 shift Solenoid valve 2 <-> 3 shift Solenoid valve 3 <-> 4 shift Solenoid valve converter lock-up clutch Control valve - modulating pressure Control valve - shift pressure
CAN Output Signals
Engine torque reduction request MIL status (whether present DTC should operate MIL) Transmission input speed Transmission output speed Converter slip Kickdown status Gear position (actual) Gear position (selected) Gear selection fault Converter lock-up status Current selected shift map Transmission oil temperature Transmission malfunction Pecus flag (state of current TCM program) Target for next gear position Gear shift torque transfer progress at shift MIL status (response to activate the MIL relevant to a DTC) OBDII fault code clear acknowledgement Transmission DTCs (P codes) Token for network status TCM Diagnostic data out to external device (PDU)
Emergency Running (elect ronic limp-home mode)
The TCM constantly monitors the transmissi on for faults. In the event of a problem the TCM will adopt the limp-home mode, in which the gear currently held remains engaged, until P is selected. The modulati ng and shift pressures will increase to
maximum and converter lock-up will be inhibited.
Following the selection of P , the only ratios available will be 2 (irrespective of forward ratio manual selection) and R .
With the vehicle at rest, the procedure to manually select is as follows:
1. 1. Select P .

Automatic Transmission/Transaxle - 4.0L SC V8 - AJ26 - Extension
Housing Seal
In-vehicle Repair
Removal
Special Tool(s)

Oil seal replacer
307-378

Driveshaft wrench
205-053
1. Disconnect the battery ground lead.
2. Select N and choc the road wheels.
3. Remove the front muffler, re fer to Operation 30.10.18.

4. Remove the engine rear mounting bracket.
1. Support the transmission.
2. Remove the bolt, engine rear mounting to transmission.
3. Remove the four bolts which secure the mounting
cross member to the body.

5. Detach the driveshaft from th e transmission drive flange.
1. If the transmission is to be refitted, mark the position of the coupling relative to the drive flange.
5. CAUTION: Under no circ umstances remove the
driveshaft to flexible coupling fixings.
2. Remove the three bolts, tr ansmission drive flange to
flexible coupling.
6. Secure the driveshaft wrench 205 - 053 to the output shaft
flange.

the specified torque figure.
2. Stake the nut to the output shaft.

4. Refit the bolts securing the dr iveshaft and tighten to the
specified torque figure.

5. Refit the the rear mounting crossmember and tighten the
securing bolts to the specified torque figures.
6. Refer to Operation 44.24.02 for fluid fill procedure.
7. Check for leaks and remove spilt fluid.

Installation


13. Remove the valve body assembly.
Remove the nine bolts which re tain the valve body to the
transmission case.
1. Installation is the re verse of the removal procedure, noting the
following:
2. Clean all mating faces and relevant parts.

3. Tighten the nine bolts securing the valve body, to the specified
torque figure.

4. Refit the dowel (leaf spring to valve body) and the leaf spring.
Fit and tighten the securing bolt to the specified torque figure.
5. Tighten the centre retaining bolt of the electrical connector to
the specified torque figure.

Automatic Transmission/Transaxle - 4.0L SC V8 - AJ26 - Transmission
Fluid Pan Gasket
In-vehicle Repair
Removal
• NOTE: This procedure will not remove re sidual fluid from the torque converter.
Installation
1. Disconnect the battery ground lead.
2. Raise the vehicle for access.

3. Drain the transmission fluid.
3. WARNING: TRANSMISSION FLUID MAY CAUSE
SEVERE BURNS, ENSURE THAT ALL SAFETY PROCEDURES
ARE OBSERVED AND THAT THE RECEPTACLE FOR WASTE
HAS SUFFICIENT CAPACITY.
Carefully remove the drain pl ug and discard the sealing
washer.

4. Remove the fluid pan.
• NOTE: The harness heatshield upper edge is retained by
a clip.
Remove the six bolts and clam ps which secure the fluid
pan to the transmission.

1. Installation is th e reverse of the re moval procedure.
Tighten the fluid pan retaining bolts to the specified torque figure.
2. Refit and tighten the drain plug to the specified torque figure.
Use a new sealing washer.

Automatic Transmission/Transaxle - 4.0L SC V8 - AJ26 - Transmission
Support Insulator
In-vehicle Repair
Removal
Installation
1. Raise the vehicle on a ramp to a suitable height for working on
the rear mounting.

2. Remove the bolt which secure s the engine rear mounting
rubber to the transmission.
3. Position a transmission jack under the transmission casing.
Take the weight of the transmission on the jack.

4. Remove the rear mounting rubber.
1. Slacken the four bolt s which secure the rear
crossmember to the vehicle floor.
2. Remove the two bolts which secure the mounting rubber to the crossmember.
3. Remove the mounting rubber.

1. Fit the mounting rubber assembly to position and tighten the
centre bolt to 30-40 Nm .
2. Tighten the crossmember to body bolts and the mounting
rubber to crossmember bolts to 22-28 Nm.