JWH

Have a '95 LS400 with the single electric cooling fan. Trying to figure out whether the malfunction is the fan motor or the swtich. Any ideas on how to test and replace these?

Saw the info on the dual fan systems for earlier LS400 but nothing for the single fan. Would appreciate any help available. THANKS

Here's the results after a 70 mile run at 80 mph non stop.

Be sure to read the entire thread. These are the results of replacing my Calif ecu 89661-50231 with a 49 state ecu 89661-50221.

The car idles 600 rpm..absolute steady..not a waver on the tach. Even after the sustained highway driving (it used to die at idle.) This proves my problem was the ecu.

The car has much better power everywhere from stoplight to stoplight or accelerating on the highway. This shows the Cali ecu's are as suspected...cut back on engine performance.

The jerking that happened when closing the throttle and then getting back on the throttle at around 45 mph has only occured once with the 49 state ecu and it was nowhere near as harsh.

So I will now return this borrowed ecu and hunt down a 49 state unit and install it in my car...or will go for the "improved" ecu if I find one at a reasonable price.

Hope this helps someone in the future.

I'm new to the forum having just purchased a 1995 LS400 with 132,000 miles on it in 7/07. It has been running GREAT with one exception. I've attempted to take it into several local mechanics and none have successfully resolved the problem, telling me it runs great.

If I travel on the freeway for 50-60 miles at speeds of 65-75 MPH, when I pull off the freeway to either a stop sign or light, the RPM dwindle and the car dies. It'll restart immediately and run normally around town after that. Do any of you Lexus experts have a suggestion for resolving this issue short of taking it into a Lexus dealership...and a wallet biopsy for me.

Thanks