Flow of Diagnosis
Diagnostic Strategy
The complexity of the electronics involved with the automatic transaxle/transmission preclude the use of workshop general electrical test equipment. Therefore, reference should be made to the approved Jaguar diagnostic system for detailed instructions on testing the automatic transaxle/transmission.
If a concern exists with the automatic transaxle/transmission, carry out a full engine diagnostic check before testing the automatic transaxle/transmission system.
The approved Jaguar diagnostic system tests and analyses, in detail, all functions of the automatic transaxle/transmission.
Where a fault involving the automatic transaxle/transmission is indicated by the approved Jaguar diagnostic system, some basic diagnostic methods may be necessary to confirm that connections are good and that the wiring is not damaged, before installing new components.
1. Verify the customer concern by operating the vehicle.
2. Check the fluid levels and condition of the fluid.
3. Check for non-factory fitted items.
4. Check the shift linkages for correct adjustment.
If the customer concern is still present, follow these steps to diagnose the concern:
5. Visually inspect for obvious signs of mechanical, electrical or hydraulic damage:
Visual Inspection Chart
Basic diagnosis
Check Fluid Level and Condition
CAUTION: The vehicle should not be driven if the fluid level is low as internal failure can result.
NOTE: If the vehicle has been operated for an extended period of time at high speeds, city traffic, hot weather, or pulling a trailer, the fluid needs to cool down 30 minutes to obtain an accurate reading.
This vehicle is not equipped with a fluid level indicator. An incorrect level may affect the transmission operation and could result in transmission damage.
High Fluid Level
A fluid level that is too high may cause the fluid to become aerated due to the churning action of the rotating internal parts. This will cause erratic control pressure, foaming, loss of fluid from the vent tube and possible transmission damage.
Low Fluid Level
A low fluid level could result in poor transmission engagement, slipping, or damage. This could also indicate a leak in one of the transmission seals or gaskets.
Adding Fluid
CAUTION: The use of any other type of transmission fluid than specified can result in transmission damage.
If fluid needs to be added, add fluid in 0.50 litre increments through the fill hole opening. Do not overfill the fluid. For fluid type, refer to the General Specification chart.
Fluid Condition Check
1. Check the fluid level.
2. Observe the color and the odor. The color under normal circumstances should be reddish, not brown or black.
3. Allow the fluid to drip onto a facial tissue and examine the stain.
4. If evidence of solid material is found, the transmission fluid pan should be removed for further inspection.
5. If fluid contamination or transmission failure is confirmed by the sediment in the bottom of the transmission fluid pan, the transmission must be disassembled and completely cleaned.
Torque Converter Operation Test
This test verifies that the torque converter clutch control system and the torque converter are operating correctly.
1. Check for DTCs. Refer to the approved Jaguar diagnostic system.
2. Connect a tachometer to the engine.
3. Bring the engine to normal operating temperature by driving the vehicle at road speeds for approximately 15 minutes in "D" position.
4. After normal operating temperature is reached, maintain a constant vehicle speed of about 80 km/h (50 mph) and tap the brake pedal with the left foot.
5. The engine rpm should increase when brake pedal is tapped, and decrease about five seconds after pedal is released.
Shift Linkage Check
Check for a misadjustment in shift linkage by matching the detents in the transmission range selector lever with those in the transmission. If they match, the misadjustment is in the indicator. Do not adjust the shift linkage.
Hydraulic leakage at the manual control valve can cause delay in engagements and/or slipping while operating if the linkage is not correctly adjusted.