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.

NOTE:

If a control module or a component is at fault and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual, or determine if any prior approval program is in operation, prior to the installation of a new module/component.
When performing voltage or resistance tests, always use a digital multimeter that has the resolution ability to view 3 decimal places. For example, on the 2 volts range can measure 1 mV or 2 K Ohm range can measure 1 Ohm. When testing resistance always take the resistance of the digital multimeter leads into account.
Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

Verify the customer concern

Visually inspect for obvious signs of damage and system integrity

VISUAL INSPECTION

MECHANICAL	ELECTRICAL
Driveshaft speed sensor installation Power Transfer Unit (PTU) actuator PTU oil leakage Left Rear Drive Unit (RDU) actuator Right Rear Drive Unit (RDU) actuator Rear Drive Unit (RDU) oil leakage Rear right halfshaft Rear left halfshaft Driveshaft	Power supply relay Fuse(s) Wiring harness physical damage or water ingress Loose or corroded electrical connectors Controller Area Network (CAN) circuits FlexRay network circuits Driveshaft speed sensor Driveline Disconnect Control Module (DDCM) All wheel drive module (AWD) All Wheel Drive Module B (AWDB)

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 and refer to the Diagnostic Trouble Code(s) (DTC) Index
Check JLR claims submission system for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and complete the recommendations as required.