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 SYSTEMS or How to Troubleshoot the CVT System(CVT) .
• 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. Turn the vehicle to the OFF (LOCK) mode.

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

   - 5. Start the engine.

   - 6. Disable the VSA by pressing the VSA OFF button (with VSA).

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

   - 8. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Direction of Drive Pulley Rotation	Forward

   Do the current condition(s) match the threshold?

   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 

   Replace the CVT drive pulley speed sensor .