A/T - Harsh Shifts/Squawk Noise During Shifts
Number: JTB00040Version 2
DATE: 31 Jul 2007
MODEL:
XJ, XK
S-TYPE
VERSION 2 OF THIS BULLETIN REPLACES PREVIOUSLY PUBLISHED BULLETINS JTB00040 V1 AND JTB00030.
THIS BULLETIN COMBINES THE CONTENT OF TWO DOCUMENTS. TEXT CHANGES ARE NOT HIGHLIGHTED.
SECTION: 307-01
Harsh Transmission Shifts or Noise During Shifts
AFFECTED VEHICLE RANGE:
XJ VIN: G00442 to G49700
S-TYPE VIN: M45255 to N52047
XK8 VIN: A30645 to A48684
CONDITION SUMMARY:
SHIFT STRATEGY DRIFT CAUSES HARSH ENGAGEMENT
Situation:
The customer may complain of harsh shifting. The adaptive shift strategy can drift over time causing higher than normal clutch pressures.
Additionally a squawk noise may be heard from the automatic transmission when changing into third gear. The noise may also occur on kick-down from fourth to third and sixth to third. A squawk or chirp noise can also be heard when changing from third to fourth gear at 50% throttle. The likely cause is that the 'E' clutch sticks and releases when engaging and disengaging gear.
CAUTION:
If the vehicle exhibits only one of the issues, select the appropriate procedure from the Repair Procedure section. For example, the additive should not be added if the complaint is only a hard shift, but no squawk.
NOTE:
The customer should be informed that after the adaption clearing procedure and re-configuration repair the transmission shift quality will improve over time as the transmission adapts to the customer's driving requirements.
Action:
Should a customer express concern about harsh shifts, improve the shift characteristic of the Transmission Control Module (TCM) by clearing the adaptions and reconfiguring the TCM using IDS DVD 106 patch file 3 or later. After the harsh shift issue has been repaired, test the vehicle and determine if the transmission is making a squawk noise during gear shifts. If the squawk noise is present follow the repair procedure to remedy it using the additive.
PARTS
TOOLS
WARRANTY:
NOTE:
Repair procedures are under constant review, and therefore times are subject to change; those quoted here must be taken as guidance only.
Always refer to DDW to obtain the latest repair time.
DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.
REPAIR PROCEDURE
ADAPTION UPDATE - PROCEDURE 1
CAUTION:
A Midtronics PSC-550 Vehicle Power Supply must be connected to the vehicle battery during diagnosis.
1. Connect the Midtronics PSC-550 power supply to the vehicle battery.
2. Ensure the ignition is switched 'OFF', parking brake is 'ON' and the transmission selector lever is in 'P' (Park).
NOTE:
IDS must be loaded with software release DVD 106 with patch file 3 or later.
3. Connect the diagnostic tester to the vehicle and begin a new diagnostic session, by entering the correct VIN for the current vehicle.
4. Read and clear all DTCs.
5. Navigate to configuration main menu and select:
^ 'Special applications'
^ 'Transmission control module Adaption Clear'
^ Run 'Application'.
6. When the adaption clear has been carried out, select and run 'Re-configure existing TCM' application from the configuration menu.
7. After the re-configuration of the TCM is complete, switch 'OFF' tester and disconnect from the vehicle.
8. Carry out the adaption drive cycle road test as follows:
^ Ensure the vehicle is in normal mode (not sports mode) and the following conditions are met.
^ Conduct the test on a flat road.
NOTE:
The transmission fluid temperature must be above 60°C (140°F) and below 100°C (212°F).
^ Ensure the vehicle is at normal operating temperature so that the transmission fluid temperature is above 60°C (140°F).
NOTE:
The accelerator pedal may not be moved during shifts.
CAUTION:
1-2, 2-3, and 3-4 shifts must occur with engine speed between the specified limits.
^ Accelerate from rest with light steady throttle without exceeding the following upper rev limits for shifting in the table.
^ Continue to accelerate gently to 50 mph (80 km/h) so that transmission shifts into 5th gear.
^ Go into overrun and let the transmission shift down into 4th gear without braking.
^ Brake gently to a standstill and hold footbrake on for at least 15 seconds.
9. Repeat the Step 8 procedure at least five times.
TRANSMISSION NOISE SERVICE - PROCEDURE 2
CAUTION:
If the service fix label is already attached to the transmission oil pan, the Repair Procedure in this bulletin should NOT be carried out. Performing the procedure a second time can cause severe damage to the transmission.
1. Raise vehicle on a four-post ramp.
2. If an S-TYPE vehicle is being repaired, remove the engine undertray. (Figure 1)
3. Place clean drain container under the transmission.
CAUTION:
The transmission must be cold before removing the fluid drain plug. The drain plug must not be fully removed as only one liter of fluid is to be collected.
NOTE:
Illustrations show XJ Range. S-TYPE and XK are similar.
4. Undo and partially remove the transmission fluid drain plug. (Figure 2)
5. Collect one liter (33.8 oz) of fluid from the transmission into a clean measuring jug.
6. Reinstall and tighten the transmission fluid drain plug to 8 Nm (5.9 lbf ft).
7. Ensure the selector lever is in 'P' and the handbrake is applied.
8. Start the engine and allow to idle.
9. Unscrew transmission filler plug and fill with one liter of the additive (C2C 37157) using a clean syringe.
10. Install filler plug.
11. Pull the service fix label off the bottle and apply it to the transmission oil pan near the filler plug. (Figure 3)
12. If an S-TYPE vehicle is being repaired, install the engine undertray. (Figure 1)
NOTE:
Global Technical Reference (GTR) lookup sequence is as follows:
GTR Home > NAS > (select vehicle and year) / Service Information > Workshop Manuals > Bookmarks "Powertrain/Automatic Transmission/Transaxle/ 307-01 Automatic Transmission/Transaxle " LINK "Transmission Fluid Level Check"
13. Refer to GTR Workshop Manual, section: 307-01 and check / top-up the transmission fluid level.
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