Diagnostics For Driveline Noise And Vibration

In the case of noise and/or vibration from the driveline system, follow the remedial steps set out below:

1. Check for Metallic Debris Within The Differential Units: Remove the differential (front and rear) drain plugs REFER to: DIFFERENTIAL DRAINING AND FILLING / DIFFERENTIAL DRAINING AND FILLING and check for evidence of metallic debris. While it is normal to see smooth graphite or fine grained deposits (see left and centre illustrations below), if there is evidence of sharp spikes or shards of metallic debris on the drain plug (see right illustration below), then this indicates an internal failure of the differential unit. Inspect the condition of the differential oil. Refer to appropriate service information. If there is evidence of sharp spikes or shards of metallic debris on the drain plug, then replace the drain plug as found and replace the differential unit as required. If there is no evidence of metallic debris on the drain plug, discard the old plug, fit a new drain plug and proceed to the next step.

   Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

2. Double flush the oil in the transfer case and rear differential. Using the Jaguar Land Rover approved diagnostic equipment, check and update the transfer case control module software and rear differential control module software to the latest level and recalibrate the rear clutch
   1. Drain and refill the rear differential. REFER to: DIFFERENTIAL DRAINING AND FILLING
   2. Drain and refill the transfer case. Refer to: TRANSFER CASE DRAINING AND FILLING (G1908027)
   3. Perform a drive cycle to allow oil to circulate around the rear differential and transfer case
   4. Repeat the drain and refill of the rear differential. REFER to: DIFFERENTIAL DRAINING AND FILLING
   5. Repeat the drain and refill of the transfer case. Refer to: TRANSFER CASE DRAINING AND FILLING (G1908027)
   6. Using the Jaguar Land Rover approved diagnostic equipment, update Rear Differential Control Module (RDCM) and Transfer Case Control Module (TCCM) to the latest level software/calibration
   7. NOTE: Additional datalogger information on clutch life can be read using the Jaguar Land Rover approved diagnostic equipment: With the engine running select - ECU Diagnostics/Rear Differential Control Module [RDCM]/Live data/"Operational Zero Position (OPZ) [D903]" - Include the value reported by the datalogger signal with the warranty return.

      Calibrate the RDCM  by performing routine - On Demand Self Test within pathfinder

   8. Calibrate the TCCM  by performing routine - Automatic Clutch Calibration Application
   9. Perform a further drive cycle to confirm the customer issue is resolved
3. In the case of either noise and/or vibration, loosen off all differential and associated driveshaft fixings. Resettle the differential units and then re-tighten the fixings in a diagonal pattern for both differential units and the associated driveshafts. When all the fixings are secured to the correct torque, road test the vehicle and check for any indications of driveline noise or vibration. If noise and/or vibration is still evident, proceed to the next step.
4. Note the position of the front driveshaft prior to removal. Remove the driveshaft. When removed, check the axle tube needle roller bearings for signs of damage. If the needle roller bearings are damaged, as indicated by a flattening of the surface of the roller bearings (see illustration below), then both the driveshaft and axle tube should be replaced. If the needle roller bearings are undamaged, the driveshaft should be rotated by 180 degrees (relative to its original installation) and re-fitted. Road test the vehicle and check for any indications of driveline noise or vibration.

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC