What is the speed sensor on a Toyota Sienna?
I have a similar transmission and CEL issue on a 2008 Sienna with 120K miles. It started shifting hard (mostly upshift between 1 and 2) and the CEL light came on with P0793 as the code. I replaced the “NC” speed sensor (top of the transmission) with an aftermarket sensor.
What kind of problem does Toyota Sienna have?
I pulled up a Toyota Technical Service Bulletin online for the 2004 Sienna and Highlander that indicates that Toyota was aware that the steering angle sensor was causing “some customers to experience an intermittent VSC activation accompanied by the VSC light and buzzer”.
Is the speed sensor on a Toyota p0793 intermittent?
Was originally intermittent, took it to a shop and they replaced the speed sensor with an aftermarket which made the shifting worse and the problem constant. Took it to a second shop and they replaced the same sensor with a OEM sensor but it didn’t fix the problem.
Where is the speed sensor on a Toyota cel?
It started shifting hard (mostly upshift between 1 and 2) and the CEL light came on with P0793 as the code. I replaced the “NC” speed sensor (top of the transmission) with an aftermarket sensor.
Can a bad speed sensor be replaced aftermarket?
The original shop should have tested the resistance between the two pins in the sensor, to verify the sensor really was bad, before replacing the part. And yes, the aftermarket sensors are garbage.
What does SPD mean on a Toyota Sienna?
SPD (NC) is always 0 while driving: Open or short in the sensor or circuit. SPD (NC) is always more than 0 and less than 300 rpm while driving the vehicle at 50 km/h (31 mph) or more: Sensor trouble, improper installation, or intermittent connection trouble of the circuit. (a) Check the speed sensor installation.
How does the ECM work on a Toyota Sienna?
By comparing the counter gear speed signal (NC) with the direct clutch speed sensor signal (NT), the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. Thus smooth gear shifting is performed.