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


FUNCTION



  • The engine-ECU monitors and checks communication with the CVT-ECU.

TROUBLE JUDGMENT


Check Condition
  • Ignition switch is "ON" position.
Judgement Criterion
  • Engine-ECU detects an error in communication between engine-ECU and CVT-ECU.

FAIL-SAFE AND BACKUP FUNCTION



  • Engine output is restricted.

PROBABLE CAUSE



  • Failed engine-ECU

DIAGNOSIS PROCEDURE

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

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

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

  • Reconfirmation of diagnosis code.

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