Owners of 2007-12 Nissan Maxima models may come in with a low power complaint.
If you dig a little deeper, you'll probably be told that the power loss only occurs below 40 mph, and that it mysteriously corrects itself as the vehicle is driven over the 40 mph threshold.
Furthermore, no warning lights will illuminate or trouble codes stored when the power issue occurs.
One probable cause, reports Nissan, is a skewed output signal from one or more of the ABS wheel speed sensors.
That of course will affect not only ABS operation, but the stability control system as well. And that's what causes the low power complaint.
To make the diagnosis, hook up a scan tool and line graph the speed sensor output signals while driving the vehicle at low speeds. If you notice a weak or erratic signal, look for a bad sensor or wiring or debris on the ABS tone wheel and repair or replace, as necessary.
"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].