Owners of 2001-02 Nissan Pathfinders with AWD systems built before June 28, 2002, may complain that the 4WD warning light on the dash comes on occasionally while the truck is being driven.
One likely cause, according to Nissan, is a damaged transfer case oil pump. A new-design oil pump, Part No. 31340-0W415, is now available to address the problem.
Before ordering the new oil pump, however, make sure there are no trouble codes present for the AWD system. If there are, take care of them first. Also make sure that all four tires are the same diameter.
Finally, ensure that the transfer case fluid temperature sensor circuit is working properly, and that the transfer case fluid isn't burnt. If everything checks out okay, install the revised pump.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].