DTC P1844: CVT Input Shaft Speed Sensor Circuit Forward Rotation Range/Performance

NOTE: 

• Before you troubleshoot, review the General Troubleshooting Information - Refer to: How to Troubleshoot the Fuel and Emissions SystemsHow to Troubleshoot the CVT System(CVT System) .
• This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

DTC (CVT)

• 1. CVT drive pulley 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 the front wheels to rotate freely.

  - 4. Start the engine.

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

  - 6. Test-drive the vehicle in D position/mode, while monitoring the Direction of Drive Pulley Rotation in the Data List with the HDS.

  - 7. Check the parameter below with the HDS.

  Signal	Current conditions
  	Values	Unit
  Direction of Drive Pulley Rotation

  Does the HDS indicate forward?

  YES 

  The CVT drive pulley 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 P1844 goes away and the PCM was updated, troubleshooting is complete. If DTC P1844 goes away and the PCM was substituted, replace the original PCM .

  NO 

  Faulty the CVT drive pulley speed sensor. Replace the CVT drive pulley speed sensor .