Code No. P1590: CVT-ECU to Engine-ECU Communication Error in Torque Reduction Request <CVT>


FUNCTION



TROUBLE JUDGEMENT


Check Condition
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q. Is diagnosis code of U0101 set?
Perform troubleshooting of CVT-ECU time-out (Refer to Code No. U0101 CVT-ECU Time-out ).
Go to Step 2.

STEP 2. M.U.T.-III other system diagnosis code

  • Confirm whether the diagnosis code is stored in the CVT-ECU.

Q. Is diagnosis code stored?
Perform troubleshooting of CVT system (Refer to GROUP 23A - Troubleshooting - Diagnosis Code Chart ).
Go to Step 3.

STEP 3. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

Q. Is diagnosis code stored?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).