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How to test a speed sensor
I have been rebuilding a wrecked Toyota Highlander(2004) that was hit on the front wheel passenger's side. I have the car and front end back together but have the following icons on the dash. The engine runs fine and the car drives OK also.
Tire Pressure alarm is flashing
I believe the front passenger's side speed sensor is bad as that wheel took the hit from the wreck. As I understand if a wheel sensor goes bad, it turns on the ABS light disabling ABS, and than when ABS is disabled it turns on the engine malfunction light, which than disables the TCS and turns on the TCS light on the dash.
As the ABS wheel speed sensors are used for tire pressure alarms by monitoring the speed of each tire, the tire pressure alarm also suggests a bad wheel speed sensor. Only 2008 Highlanders monitor tire pressure directly.
I have ordered a scan tool from scantool.net model Elmscan 5 USB ScanXL, and will read the trouble code/codes when it comes in, but I do believe the passenger's side front wheel sensor is bad.
The Elmscan scan tool looks like a good deal for the money and will allow me to read trouble codes, sensor data and turn off/reset any trouble or maintenance codes, we will see. The ScanXL software provides some nice graphical displays of engine parameters and ability to make some performance measurements.
Anybody using this scan tool?
Do any of the Toyota techs or others out there know how to test a wheel speed sensor on a 2004 Toyota Highlander?
Last edited by jfwireless; 11-06-2008 at 01:08 PM.