Land Rover Discovery: External Controls
/ Diagnosis and Testing
PRINCIPLES OF OPERATION
For a detailed description of the Automatic Transmission External Controls,
refer to the relevant Description and Operation section in the workshop
manual. REFER to: External Controls (307-05 Automatic
Transmission/Transaxle External Controls, Description and Operation).
INSPECTION AND VERIFICATION
CAUTION:
Diagnosis by substitution from a donor vehicle is NOT acceptable.
Substitution of control modules does not guarantee confirmation of a
fault, and may also cause additional faults in the vehicle being tested
and/or the donor vehicle.
NOTES:
- Verify the customer concern
- Visually inspect for obvious signs of damage and system integrity
Visual Inspection
![Visual Inspection](images/books/227/index432(2).jpg)
- If an obvious cause for an observed or reported concern is found,
correct the cause (if possible) before proceeding to the next step
- If the cause is not visually evident, verify the symptom and refer to
the
Symptom Chart, alternatively check for Diagnostic Trouble Codes
(DTCs) and refer to the DTC Index
- Check DDW for open campaigns. Refer to the corresponding bulletins
and SSMs which may be valid for the specific customer complaint and
carry out the recommendations as required
SYMPTOM CHART
![SYMPTOM CHART](images/books/227/index433(2).jpg)
SYMPTOM
Transmission
control
switch
inoperative
POSSIBLE
CAUSES
- Transmission
control
switch
system fault
ACTION
- Using the Jaguar Land Rover approved diagnostic
equipment, check the transmission control switch for
related DTCs and refer to the relevant DTC index
DTC INDEX
For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this
vehicle, please refer to Section 100-00. REFER to: Diagnostic Trouble Code
Index - DTC: Transmission Control Switch (TCS) (100-00 General
Information, Description and Operation).
External Controls
Specifications
General Specification
![General Specification](images/books/227/index434(2).jpg)
Torque Specifications
![Torque Specifications](images/books/227/index435(2).jpg)
READ NEXT:
COMPONENT LOCATION
Paddle switches - upshift / downshift
Transmission Control Switch (TCS)
Transmission Control Module (TCM)
ZF 9HP48 Automatic transmission
Automatic Transmission Fluid (ATF)
The transmission comprises the main casing which houses all of the
transmission components. The torque converter is located in a separate
converter housing, bolted to the main casing.
ZF 9HP48 Cut-Awa
The valve block is located in a vertical position at the front of the
transmission main casing, behind a sealed cover. The valve block contains a
number of solenoids and spool valves to control the t
SEE MORE:
REMOVAL
NOTES:
This procedure contains some variation in the illustrations
depending on the vehicle specification, but the essential
information is always correct.
This procedure contains illustrations showing certain components
removed to provide extra clarity.
Raise and support the vehicle
SPECIAL TOOL(S)
GENERAL EQUIPMENT
REMOVAL
WARNING:
Make sure to support the vehicle with axle stands.
Raise and support the vehicle.
Refer to: Wheel Knuckle (204-01 Front Suspension, Removal and
Installation).
Special Tool(s): JLR-204-806
Special Tool(s): 204-726
General Equipment: Hyd