DTC Troubleshooting: P1841
DTC P1841: CVT Speed Sensor Circuit Reverse Rotation Range/Performance
NOTE:
Before you troubleshoot, review the General Troubleshooting Information.
This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P1841 CVT Speed Sensor Circuit Reverse Rotation Range/Performance
      

1.
CVT speed sensor check:

CVT speed sensor check
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Raise the vehicle on a lift. Make sure it is securely supported, and allow all four wheels to rotate freely.

?4.
Start the engine.

?5.
Disable the VSA by pressing the VSA OFF button.

NOTE: Enter the VSA maintenance mode in case of the vehicle speed above 31 mph (50 km/h).

?6.
Test-drive the vehicle in R position/mode, while monitoring the Direction of Secondary-shaft Rotation in the Data List with the HDS.

?7.
Check the parameter below with the HDS.
Signal
Current conditions
Values
Unit
Direction of Secondary-shaft Rotation
    

Does the HDS indicate reverse?

     
YES
     
     
     
The CVT speed sensor is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P1841 goes away and the PCM was updated, troubleshooting is complete. If DTC P1841 goes away and the PCM was substituted, replace the original PCM.?
     
NO